The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
Hiroki Uehara - One of the best experts on this subject based on the ideXlab platform.
-
in situ analysis for melt Drawing Behavior of ultra high molecular weight polyethylene normal molecular weight polyethylene blend films
Polymer, 2021Co-Authors: Hidekazu Tanaka, Masaki Kakiage, Takeshi Yamanobe, Saki Saijo, Hiroki UeharaAbstract:Abstract Blend films composed of ultrahigh molecular weight polyethylene (UHMW-PE) and normal molecular weight polyethylene (NMW-PE) with various ratios were prepared. Structural development during melt-Drawing at 150 °C for these blend films were analyzed by using in-situ measurement combined with stress-strain curve and wide-angle X-ray diffraction (WAXD). With increasing NMW-PE composition, the stress value on the plateau-stress region decreases, and the slope of stress hardening due to subsequent oriented crystallization becomes gentler. Correspondingly, the in-situ measurement results clarified that blending NMW-PE restricts amorphous orientation during melt-Drawing, and delays the appearance of the orthorhombic reflections. Additionally, the hexagonal crystallization, which is characteristic of melt-Drawing of pure UHMW-PE, was unrecognizable for blend films. These results indicate that blending NMW-PE reduces the amount of molecular entanglements under molten state and accelerates disentanglement during melt-Drawing. During cooling after such melt-Drawing for blend films, arc-shaped orthorhombic reflections spreading along azimuthal direction newly appear. Morphological observation of the resultant melt-drawn films suggests that blending NMW-PE induces thin formation of the extended crystal chain (ECC), thus subsequent epitaxial crystallization of folded crystal chains (FCC) during cooling gives the homogeneous lamellae structure arranged perpendicular to Drawing direction.
-
In-situ analysis for melt-Drawing Behavior of ultra-high molecular weight polyethylene / normal molecular weight polyethylene blend films
Polymer, 2021Co-Authors: Hidekazu Tanaka, Masaki Kakiage, Takeshi Yamanobe, Saki Saijo, Hiroki UeharaAbstract:Abstract Blend films composed of ultrahigh molecular weight polyethylene (UHMW-PE) and normal molecular weight polyethylene (NMW-PE) with various ratios were prepared. Structural development during melt-Drawing at 150 °C for these blend films were analyzed by using in-situ measurement combined with stress-strain curve and wide-angle X-ray diffraction (WAXD). With increasing NMW-PE composition, the stress value on the plateau-stress region decreases, and the slope of stress hardening due to subsequent oriented crystallization becomes gentler. Correspondingly, the in-situ measurement results clarified that blending NMW-PE restricts amorphous orientation during melt-Drawing, and delays the appearance of the orthorhombic reflections. Additionally, the hexagonal crystallization, which is characteristic of melt-Drawing of pure UHMW-PE, was unrecognizable for blend films. These results indicate that blending NMW-PE reduces the amount of molecular entanglements under molten state and accelerates disentanglement during melt-Drawing. During cooling after such melt-Drawing for blend films, arc-shaped orthorhombic reflections spreading along azimuthal direction newly appear. Morphological observation of the resultant melt-drawn films suggests that blending NMW-PE induces thin formation of the extended crystal chain (ECC), thus subsequent epitaxial crystallization of folded crystal chains (FCC) during cooling gives the homogeneous lamellae structure arranged perpendicular to Drawing direction.
-
Oriented Crystallization Induced by Uniaxial Drawing from Poly(tetrafluoroethylene) Melt
Macromolecules, 2007Co-Authors: Takashi Morioka, Masaki Kakiage, Takeshi Yamanobe, Tadashi Komoto, Yoshiaki Higuchi, Hiroki Kamiya, Kiyotaka Arai, And Syozo Murakami, Hiroki UeharaAbstract:The melt-Drawing Behavior of poly(tetrafluoroethylene) (PTFE) with ultrahigh molecular weight (UHMW) was analyzed using in situ measurements composed of stress−strain curves and wide-angle X-ray diffraction with synchrotron radiation. The stress−strain Behavior of the melt-Drawing of UHMW−PTFE was quite different from that of the solid Drawing. In particular, the former exhibited a plateau stress region, followed by a rapid increase in stress with strain. No crystalline reflection appeared in the plateau stress region. However, oriented crystallization was observed in the later strain-hardening region. Correspondingly, the resultant mechanical properties and transparency of the melt-drawn films are much better than those of the solid-drawn films. Optimizing the melt-Drawing conditions elongated the plateau stress region, which successfully achieved further property development. The effects of sample MW on melt-Drawing Behavior and resultant properties were also discussed. The lower MW film produced a long...
-
Effects of molecular characteristics and processing conditions on melt‐Drawing Behavior of ultrahigh molecular weight polyethylene
Journal of Polymer Science Part B: Polymer Physics, 2006Co-Authors: Masaki Kakiage, Takeshi Yamanobe, Tadashi Komoto, Syozo Murakami, Hiroki UeharaAbstract:The effects of molecular characteristics and processing conditions on melt-Drawing Behavior of ultrahigh molecular weight polyethylene (UHMW-PE) are discussed, based on a combination of in situ X-ray measurement and stress–strain Behavior. The sample films of metallocene- and Ziegler-catalyzed UHMW-PEs with a similar viscosity average MW of ∼107 were prepared by compression molding at 180 °C. Stress profiles recorded at 160 °C above the melting temperature of 135 °C exhibited a plateau stress region for both films. The relative change in the intensities of the amorphous scattering recorded on the equator and on the meridian indicated the orientation of amorphous chains along the draw axis with increasing strain. However, there was a substantial difference in the subsequent crystallization into the hexagonal phase, reflecting the molecular characteristics, that is, MW distribution of each sample film. Rapid crystallization into the hexagonal phase occurred at the beginning point of the plateau stress region in melt-Drawing for metallocene-catalyzed UHMW-PE film. In contrast, gradual crystallization into the hexagonal phase occurred at the middle point of the plateau stress region for the Ziegler-catalyzed film, suggesting an ease of chain slippage during Drawing. These results demonstrate that the difference in the MW distribution due to the polymerization catalyst system dominates the phase development mechanism during melt-Drawing. The effect of the processing conditions, that is, the including strain rate and Drawing temperature, on the melt-Drawing Behavior is also discussed. The obtained results indicate that the traditional temperature–strain rate relationship is effective for transient crystallization in to the hexagonal phase during melt-Drawing, as well as for typically oriented crystallization during ultraDrawing in the solid state. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 2455–2467, 2006
-
effects of molecular characteristics and processing conditions on melt Drawing Behavior of ultrahigh molecular weight polyethylene
Journal of Polymer Science Part B, 2006Co-Authors: Masaki Kakiage, Takeshi Yamanobe, Tadashi Komoto, Syozo Murakami, Hiroki UeharaAbstract:The effects of molecular characteristics and processing conditions on melt-Drawing Behavior of ultrahigh molecular weight polyethylene (UHMW-PE) are discussed, based on a combination of in situ X-ray measurement and stress–strain Behavior. The sample films of metallocene- and Ziegler-catalyzed UHMW-PEs with a similar viscosity average MW of ∼107 were prepared by compression molding at 180 °C. Stress profiles recorded at 160 °C above the melting temperature of 135 °C exhibited a plateau stress region for both films. The relative change in the intensities of the amorphous scattering recorded on the equator and on the meridian indicated the orientation of amorphous chains along the draw axis with increasing strain. However, there was a substantial difference in the subsequent crystallization into the hexagonal phase, reflecting the molecular characteristics, that is, MW distribution of each sample film. Rapid crystallization into the hexagonal phase occurred at the beginning point of the plateau stress region in melt-Drawing for metallocene-catalyzed UHMW-PE film. In contrast, gradual crystallization into the hexagonal phase occurred at the middle point of the plateau stress region for the Ziegler-catalyzed film, suggesting an ease of chain slippage during Drawing. These results demonstrate that the difference in the MW distribution due to the polymerization catalyst system dominates the phase development mechanism during melt-Drawing. The effect of the processing conditions, that is, the including strain rate and Drawing temperature, on the melt-Drawing Behavior is also discussed. The obtained results indicate that the traditional temperature–strain rate relationship is effective for transient crystallization in to the hexagonal phase during melt-Drawing, as well as for typically oriented crystallization during ultraDrawing in the solid state. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 2455–2467, 2006
Masaki Kakiage - One of the best experts on this subject based on the ideXlab platform.
-
in situ analysis for melt Drawing Behavior of ultra high molecular weight polyethylene normal molecular weight polyethylene blend films
Polymer, 2021Co-Authors: Hidekazu Tanaka, Masaki Kakiage, Takeshi Yamanobe, Saki Saijo, Hiroki UeharaAbstract:Abstract Blend films composed of ultrahigh molecular weight polyethylene (UHMW-PE) and normal molecular weight polyethylene (NMW-PE) with various ratios were prepared. Structural development during melt-Drawing at 150 °C for these blend films were analyzed by using in-situ measurement combined with stress-strain curve and wide-angle X-ray diffraction (WAXD). With increasing NMW-PE composition, the stress value on the plateau-stress region decreases, and the slope of stress hardening due to subsequent oriented crystallization becomes gentler. Correspondingly, the in-situ measurement results clarified that blending NMW-PE restricts amorphous orientation during melt-Drawing, and delays the appearance of the orthorhombic reflections. Additionally, the hexagonal crystallization, which is characteristic of melt-Drawing of pure UHMW-PE, was unrecognizable for blend films. These results indicate that blending NMW-PE reduces the amount of molecular entanglements under molten state and accelerates disentanglement during melt-Drawing. During cooling after such melt-Drawing for blend films, arc-shaped orthorhombic reflections spreading along azimuthal direction newly appear. Morphological observation of the resultant melt-drawn films suggests that blending NMW-PE induces thin formation of the extended crystal chain (ECC), thus subsequent epitaxial crystallization of folded crystal chains (FCC) during cooling gives the homogeneous lamellae structure arranged perpendicular to Drawing direction.
-
In-situ analysis for melt-Drawing Behavior of ultra-high molecular weight polyethylene / normal molecular weight polyethylene blend films
Polymer, 2021Co-Authors: Hidekazu Tanaka, Masaki Kakiage, Takeshi Yamanobe, Saki Saijo, Hiroki UeharaAbstract:Abstract Blend films composed of ultrahigh molecular weight polyethylene (UHMW-PE) and normal molecular weight polyethylene (NMW-PE) with various ratios were prepared. Structural development during melt-Drawing at 150 °C for these blend films were analyzed by using in-situ measurement combined with stress-strain curve and wide-angle X-ray diffraction (WAXD). With increasing NMW-PE composition, the stress value on the plateau-stress region decreases, and the slope of stress hardening due to subsequent oriented crystallization becomes gentler. Correspondingly, the in-situ measurement results clarified that blending NMW-PE restricts amorphous orientation during melt-Drawing, and delays the appearance of the orthorhombic reflections. Additionally, the hexagonal crystallization, which is characteristic of melt-Drawing of pure UHMW-PE, was unrecognizable for blend films. These results indicate that blending NMW-PE reduces the amount of molecular entanglements under molten state and accelerates disentanglement during melt-Drawing. During cooling after such melt-Drawing for blend films, arc-shaped orthorhombic reflections spreading along azimuthal direction newly appear. Morphological observation of the resultant melt-drawn films suggests that blending NMW-PE induces thin formation of the extended crystal chain (ECC), thus subsequent epitaxial crystallization of folded crystal chains (FCC) during cooling gives the homogeneous lamellae structure arranged perpendicular to Drawing direction.
-
Oriented Crystallization Induced by Uniaxial Drawing from Poly(tetrafluoroethylene) Melt
Macromolecules, 2007Co-Authors: Takashi Morioka, Masaki Kakiage, Takeshi Yamanobe, Tadashi Komoto, Yoshiaki Higuchi, Hiroki Kamiya, Kiyotaka Arai, And Syozo Murakami, Hiroki UeharaAbstract:The melt-Drawing Behavior of poly(tetrafluoroethylene) (PTFE) with ultrahigh molecular weight (UHMW) was analyzed using in situ measurements composed of stress−strain curves and wide-angle X-ray diffraction with synchrotron radiation. The stress−strain Behavior of the melt-Drawing of UHMW−PTFE was quite different from that of the solid Drawing. In particular, the former exhibited a plateau stress region, followed by a rapid increase in stress with strain. No crystalline reflection appeared in the plateau stress region. However, oriented crystallization was observed in the later strain-hardening region. Correspondingly, the resultant mechanical properties and transparency of the melt-drawn films are much better than those of the solid-drawn films. Optimizing the melt-Drawing conditions elongated the plateau stress region, which successfully achieved further property development. The effects of sample MW on melt-Drawing Behavior and resultant properties were also discussed. The lower MW film produced a long...
-
Effects of molecular characteristics and processing conditions on melt‐Drawing Behavior of ultrahigh molecular weight polyethylene
Journal of Polymer Science Part B: Polymer Physics, 2006Co-Authors: Masaki Kakiage, Takeshi Yamanobe, Tadashi Komoto, Syozo Murakami, Hiroki UeharaAbstract:The effects of molecular characteristics and processing conditions on melt-Drawing Behavior of ultrahigh molecular weight polyethylene (UHMW-PE) are discussed, based on a combination of in situ X-ray measurement and stress–strain Behavior. The sample films of metallocene- and Ziegler-catalyzed UHMW-PEs with a similar viscosity average MW of ∼107 were prepared by compression molding at 180 °C. Stress profiles recorded at 160 °C above the melting temperature of 135 °C exhibited a plateau stress region for both films. The relative change in the intensities of the amorphous scattering recorded on the equator and on the meridian indicated the orientation of amorphous chains along the draw axis with increasing strain. However, there was a substantial difference in the subsequent crystallization into the hexagonal phase, reflecting the molecular characteristics, that is, MW distribution of each sample film. Rapid crystallization into the hexagonal phase occurred at the beginning point of the plateau stress region in melt-Drawing for metallocene-catalyzed UHMW-PE film. In contrast, gradual crystallization into the hexagonal phase occurred at the middle point of the plateau stress region for the Ziegler-catalyzed film, suggesting an ease of chain slippage during Drawing. These results demonstrate that the difference in the MW distribution due to the polymerization catalyst system dominates the phase development mechanism during melt-Drawing. The effect of the processing conditions, that is, the including strain rate and Drawing temperature, on the melt-Drawing Behavior is also discussed. The obtained results indicate that the traditional temperature–strain rate relationship is effective for transient crystallization in to the hexagonal phase during melt-Drawing, as well as for typically oriented crystallization during ultraDrawing in the solid state. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 2455–2467, 2006
-
effects of molecular characteristics and processing conditions on melt Drawing Behavior of ultrahigh molecular weight polyethylene
Journal of Polymer Science Part B, 2006Co-Authors: Masaki Kakiage, Takeshi Yamanobe, Tadashi Komoto, Syozo Murakami, Hiroki UeharaAbstract:The effects of molecular characteristics and processing conditions on melt-Drawing Behavior of ultrahigh molecular weight polyethylene (UHMW-PE) are discussed, based on a combination of in situ X-ray measurement and stress–strain Behavior. The sample films of metallocene- and Ziegler-catalyzed UHMW-PEs with a similar viscosity average MW of ∼107 were prepared by compression molding at 180 °C. Stress profiles recorded at 160 °C above the melting temperature of 135 °C exhibited a plateau stress region for both films. The relative change in the intensities of the amorphous scattering recorded on the equator and on the meridian indicated the orientation of amorphous chains along the draw axis with increasing strain. However, there was a substantial difference in the subsequent crystallization into the hexagonal phase, reflecting the molecular characteristics, that is, MW distribution of each sample film. Rapid crystallization into the hexagonal phase occurred at the beginning point of the plateau stress region in melt-Drawing for metallocene-catalyzed UHMW-PE film. In contrast, gradual crystallization into the hexagonal phase occurred at the middle point of the plateau stress region for the Ziegler-catalyzed film, suggesting an ease of chain slippage during Drawing. These results demonstrate that the difference in the MW distribution due to the polymerization catalyst system dominates the phase development mechanism during melt-Drawing. The effect of the processing conditions, that is, the including strain rate and Drawing temperature, on the melt-Drawing Behavior is also discussed. The obtained results indicate that the traditional temperature–strain rate relationship is effective for transient crystallization in to the hexagonal phase during melt-Drawing, as well as for typically oriented crystallization during ultraDrawing in the solid state. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 2455–2467, 2006
Takeshi Yamanobe - One of the best experts on this subject based on the ideXlab platform.
-
in situ analysis for melt Drawing Behavior of ultra high molecular weight polyethylene normal molecular weight polyethylene blend films
Polymer, 2021Co-Authors: Hidekazu Tanaka, Masaki Kakiage, Takeshi Yamanobe, Saki Saijo, Hiroki UeharaAbstract:Abstract Blend films composed of ultrahigh molecular weight polyethylene (UHMW-PE) and normal molecular weight polyethylene (NMW-PE) with various ratios were prepared. Structural development during melt-Drawing at 150 °C for these blend films were analyzed by using in-situ measurement combined with stress-strain curve and wide-angle X-ray diffraction (WAXD). With increasing NMW-PE composition, the stress value on the plateau-stress region decreases, and the slope of stress hardening due to subsequent oriented crystallization becomes gentler. Correspondingly, the in-situ measurement results clarified that blending NMW-PE restricts amorphous orientation during melt-Drawing, and delays the appearance of the orthorhombic reflections. Additionally, the hexagonal crystallization, which is characteristic of melt-Drawing of pure UHMW-PE, was unrecognizable for blend films. These results indicate that blending NMW-PE reduces the amount of molecular entanglements under molten state and accelerates disentanglement during melt-Drawing. During cooling after such melt-Drawing for blend films, arc-shaped orthorhombic reflections spreading along azimuthal direction newly appear. Morphological observation of the resultant melt-drawn films suggests that blending NMW-PE induces thin formation of the extended crystal chain (ECC), thus subsequent epitaxial crystallization of folded crystal chains (FCC) during cooling gives the homogeneous lamellae structure arranged perpendicular to Drawing direction.
-
In-situ analysis for melt-Drawing Behavior of ultra-high molecular weight polyethylene / normal molecular weight polyethylene blend films
Polymer, 2021Co-Authors: Hidekazu Tanaka, Masaki Kakiage, Takeshi Yamanobe, Saki Saijo, Hiroki UeharaAbstract:Abstract Blend films composed of ultrahigh molecular weight polyethylene (UHMW-PE) and normal molecular weight polyethylene (NMW-PE) with various ratios were prepared. Structural development during melt-Drawing at 150 °C for these blend films were analyzed by using in-situ measurement combined with stress-strain curve and wide-angle X-ray diffraction (WAXD). With increasing NMW-PE composition, the stress value on the plateau-stress region decreases, and the slope of stress hardening due to subsequent oriented crystallization becomes gentler. Correspondingly, the in-situ measurement results clarified that blending NMW-PE restricts amorphous orientation during melt-Drawing, and delays the appearance of the orthorhombic reflections. Additionally, the hexagonal crystallization, which is characteristic of melt-Drawing of pure UHMW-PE, was unrecognizable for blend films. These results indicate that blending NMW-PE reduces the amount of molecular entanglements under molten state and accelerates disentanglement during melt-Drawing. During cooling after such melt-Drawing for blend films, arc-shaped orthorhombic reflections spreading along azimuthal direction newly appear. Morphological observation of the resultant melt-drawn films suggests that blending NMW-PE induces thin formation of the extended crystal chain (ECC), thus subsequent epitaxial crystallization of folded crystal chains (FCC) during cooling gives the homogeneous lamellae structure arranged perpendicular to Drawing direction.
-
Oriented Crystallization Induced by Uniaxial Drawing from Poly(tetrafluoroethylene) Melt
Macromolecules, 2007Co-Authors: Takashi Morioka, Masaki Kakiage, Takeshi Yamanobe, Tadashi Komoto, Yoshiaki Higuchi, Hiroki Kamiya, Kiyotaka Arai, And Syozo Murakami, Hiroki UeharaAbstract:The melt-Drawing Behavior of poly(tetrafluoroethylene) (PTFE) with ultrahigh molecular weight (UHMW) was analyzed using in situ measurements composed of stress−strain curves and wide-angle X-ray diffraction with synchrotron radiation. The stress−strain Behavior of the melt-Drawing of UHMW−PTFE was quite different from that of the solid Drawing. In particular, the former exhibited a plateau stress region, followed by a rapid increase in stress with strain. No crystalline reflection appeared in the plateau stress region. However, oriented crystallization was observed in the later strain-hardening region. Correspondingly, the resultant mechanical properties and transparency of the melt-drawn films are much better than those of the solid-drawn films. Optimizing the melt-Drawing conditions elongated the plateau stress region, which successfully achieved further property development. The effects of sample MW on melt-Drawing Behavior and resultant properties were also discussed. The lower MW film produced a long...
-
Effects of molecular characteristics and processing conditions on melt‐Drawing Behavior of ultrahigh molecular weight polyethylene
Journal of Polymer Science Part B: Polymer Physics, 2006Co-Authors: Masaki Kakiage, Takeshi Yamanobe, Tadashi Komoto, Syozo Murakami, Hiroki UeharaAbstract:The effects of molecular characteristics and processing conditions on melt-Drawing Behavior of ultrahigh molecular weight polyethylene (UHMW-PE) are discussed, based on a combination of in situ X-ray measurement and stress–strain Behavior. The sample films of metallocene- and Ziegler-catalyzed UHMW-PEs with a similar viscosity average MW of ∼107 were prepared by compression molding at 180 °C. Stress profiles recorded at 160 °C above the melting temperature of 135 °C exhibited a plateau stress region for both films. The relative change in the intensities of the amorphous scattering recorded on the equator and on the meridian indicated the orientation of amorphous chains along the draw axis with increasing strain. However, there was a substantial difference in the subsequent crystallization into the hexagonal phase, reflecting the molecular characteristics, that is, MW distribution of each sample film. Rapid crystallization into the hexagonal phase occurred at the beginning point of the plateau stress region in melt-Drawing for metallocene-catalyzed UHMW-PE film. In contrast, gradual crystallization into the hexagonal phase occurred at the middle point of the plateau stress region for the Ziegler-catalyzed film, suggesting an ease of chain slippage during Drawing. These results demonstrate that the difference in the MW distribution due to the polymerization catalyst system dominates the phase development mechanism during melt-Drawing. The effect of the processing conditions, that is, the including strain rate and Drawing temperature, on the melt-Drawing Behavior is also discussed. The obtained results indicate that the traditional temperature–strain rate relationship is effective for transient crystallization in to the hexagonal phase during melt-Drawing, as well as for typically oriented crystallization during ultraDrawing in the solid state. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 2455–2467, 2006
-
effects of molecular characteristics and processing conditions on melt Drawing Behavior of ultrahigh molecular weight polyethylene
Journal of Polymer Science Part B, 2006Co-Authors: Masaki Kakiage, Takeshi Yamanobe, Tadashi Komoto, Syozo Murakami, Hiroki UeharaAbstract:The effects of molecular characteristics and processing conditions on melt-Drawing Behavior of ultrahigh molecular weight polyethylene (UHMW-PE) are discussed, based on a combination of in situ X-ray measurement and stress–strain Behavior. The sample films of metallocene- and Ziegler-catalyzed UHMW-PEs with a similar viscosity average MW of ∼107 were prepared by compression molding at 180 °C. Stress profiles recorded at 160 °C above the melting temperature of 135 °C exhibited a plateau stress region for both films. The relative change in the intensities of the amorphous scattering recorded on the equator and on the meridian indicated the orientation of amorphous chains along the draw axis with increasing strain. However, there was a substantial difference in the subsequent crystallization into the hexagonal phase, reflecting the molecular characteristics, that is, MW distribution of each sample film. Rapid crystallization into the hexagonal phase occurred at the beginning point of the plateau stress region in melt-Drawing for metallocene-catalyzed UHMW-PE film. In contrast, gradual crystallization into the hexagonal phase occurred at the middle point of the plateau stress region for the Ziegler-catalyzed film, suggesting an ease of chain slippage during Drawing. These results demonstrate that the difference in the MW distribution due to the polymerization catalyst system dominates the phase development mechanism during melt-Drawing. The effect of the processing conditions, that is, the including strain rate and Drawing temperature, on the melt-Drawing Behavior is also discussed. The obtained results indicate that the traditional temperature–strain rate relationship is effective for transient crystallization in to the hexagonal phase during melt-Drawing, as well as for typically oriented crystallization during ultraDrawing in the solid state. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 2455–2467, 2006
Cees W. M. Bastiaansen - One of the best experts on this subject based on the ideXlab platform.
-
Drawing Behavior and mechanical properties of ultra-high molecular weight polyethylene blends with a linear polyethylene wax
Polymer, 2018Co-Authors: Lihua Shen, John R. Severn, Cees W. M. BastiaansenAbstract:Abstract Ultra-high molecular weight polyethylene (UHMWPE; Mw = 103 kg/mol) is blended with a low molecular weight, linear polyethylene (PEwax; Mw = 1 kg/mol) and the solid state Drawing Behavior and mechanical properties are explored. The results indicate that the low molecular weight polyethylene wax acts as a solvent for the UHMWPE which leads to an improvement in rheological properties and the maximum attainable draw ratio of the blends. The maximum attainable Young's modulus of the drawn films increases with more than a factor 2 without removal of the solvent. Moreover, it is found that the maximum attainable tensile strength of the drawn blends also increases significantly from ∼1 GPa to ∼1.5 GPa upon addition of 60 wt% of the PEwax. Based on these results, a new route is proposed for the processing of highly oriented polyethylene, which has certain characteristics in common with both melt spinning and solution spinning but, in fact, is neither of the two.
-
Materials Science and Technology - High-Modulus and High-Strength Fibers Based on Flexible Macromolecules
Materials Science and Technology, 2006Co-Authors: Cees W. M. BastiaansenAbstract:A review with many refs. on high-modulus and high-strength fibers based on flexible macromols including ultimate stiffness, strength, and drawability of flexible fibers, spinning, ultraDrawing, and properties of linear polyethylene, Drawing Behavior and properties of flexible semicryst. polymers.
Hidekazu Tanaka - One of the best experts on this subject based on the ideXlab platform.
-
in situ analysis for melt Drawing Behavior of ultra high molecular weight polyethylene normal molecular weight polyethylene blend films
Polymer, 2021Co-Authors: Hidekazu Tanaka, Masaki Kakiage, Takeshi Yamanobe, Saki Saijo, Hiroki UeharaAbstract:Abstract Blend films composed of ultrahigh molecular weight polyethylene (UHMW-PE) and normal molecular weight polyethylene (NMW-PE) with various ratios were prepared. Structural development during melt-Drawing at 150 °C for these blend films were analyzed by using in-situ measurement combined with stress-strain curve and wide-angle X-ray diffraction (WAXD). With increasing NMW-PE composition, the stress value on the plateau-stress region decreases, and the slope of stress hardening due to subsequent oriented crystallization becomes gentler. Correspondingly, the in-situ measurement results clarified that blending NMW-PE restricts amorphous orientation during melt-Drawing, and delays the appearance of the orthorhombic reflections. Additionally, the hexagonal crystallization, which is characteristic of melt-Drawing of pure UHMW-PE, was unrecognizable for blend films. These results indicate that blending NMW-PE reduces the amount of molecular entanglements under molten state and accelerates disentanglement during melt-Drawing. During cooling after such melt-Drawing for blend films, arc-shaped orthorhombic reflections spreading along azimuthal direction newly appear. Morphological observation of the resultant melt-drawn films suggests that blending NMW-PE induces thin formation of the extended crystal chain (ECC), thus subsequent epitaxial crystallization of folded crystal chains (FCC) during cooling gives the homogeneous lamellae structure arranged perpendicular to Drawing direction.
-
In-situ analysis for melt-Drawing Behavior of ultra-high molecular weight polyethylene / normal molecular weight polyethylene blend films
Polymer, 2021Co-Authors: Hidekazu Tanaka, Masaki Kakiage, Takeshi Yamanobe, Saki Saijo, Hiroki UeharaAbstract:Abstract Blend films composed of ultrahigh molecular weight polyethylene (UHMW-PE) and normal molecular weight polyethylene (NMW-PE) with various ratios were prepared. Structural development during melt-Drawing at 150 °C for these blend films were analyzed by using in-situ measurement combined with stress-strain curve and wide-angle X-ray diffraction (WAXD). With increasing NMW-PE composition, the stress value on the plateau-stress region decreases, and the slope of stress hardening due to subsequent oriented crystallization becomes gentler. Correspondingly, the in-situ measurement results clarified that blending NMW-PE restricts amorphous orientation during melt-Drawing, and delays the appearance of the orthorhombic reflections. Additionally, the hexagonal crystallization, which is characteristic of melt-Drawing of pure UHMW-PE, was unrecognizable for blend films. These results indicate that blending NMW-PE reduces the amount of molecular entanglements under molten state and accelerates disentanglement during melt-Drawing. During cooling after such melt-Drawing for blend films, arc-shaped orthorhombic reflections spreading along azimuthal direction newly appear. Morphological observation of the resultant melt-drawn films suggests that blending NMW-PE induces thin formation of the extended crystal chain (ECC), thus subsequent epitaxial crystallization of folded crystal chains (FCC) during cooling gives the homogeneous lamellae structure arranged perpendicular to Drawing direction.
