The Experts below are selected from a list of 3750 Experts worldwide ranked by ideXlab platform
Feng Chen - One of the best experts on this subject based on the ideXlab platform.
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processing condition induced structural evolution in the alternating multi layer structure during high Speed thin wall Injection molding
Polymer, 2016Co-Authors: Yi Zhou, Feilong Yu, Qin Zhang, Hua Deng, Ke Wang, Feng Chen, Qiang FuAbstract:Abstract Polymeric materials with alternating multi-layer structure have gained much attention in the field of biomimic, where many methods were used to prepare materials with such structure for various functionalities. A simple method based on high Speed thin-wall Injection molding (HSTWIM) has been proposed in our previous studies for the easy fabrication of multi-layer functional polymeric materials. Herein, the effect of various Injection processing parameters: Injection distance, Injection Speed, mold temperature and mold thickness on the phase morphology and molecular orientation is studied. The processing condition induced changes in flow field, temperature field, viscosity and shear time are thought to largely influence the confinement of melt during processing, thus, their final phase morphology. It is observed that moderate Injection distance, moderate Injection Speed, moderate mold temperature and thin mold favors the formation of such alternating multi-layer structure. Such study could provide guidelines for the fabrication of functional multi-layered structure through HSTWIM as well as control of phase morphology through confined flow.
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HIGH Speed Injection MOLDING OF HIGH DENSITY POLYETHYLENE — EFFECTS OF Injection Speed ON STRUCTURE AND PROPERTIES
Chinese Journal of Polymer Science, 2011Co-Authors: Kun Jiang, Feilong Yu, Qin Zhang, Hua Deng, Ke Wang, Run Su, Jinghui Yang, Tiannan Zhou, Feng ChenAbstract:Thin wall samples of high density polyethylene (HDPE) were prepared via Injection molding with different Injection Speeds ranging from 100 mm/s to 1200 mm/s. A significant decrease in the tensile strength and Young’s modulus was observed with increasing Injection Speed. In order to investigate the mechanism behind this decrease, the orientation, molecular weight, molecular weight distribution, melt flow rate, crystallinity and crystal morphology of HDPE were characterized using two-dimensional wide-angle X-ray diffraction (2D-WAXD), gel permeation chromatography (GPC), capillary rheometry and differential scanning calorimetry (DSC), respectively. It is demonstrated that the orientation, molecular weight, molecular weight distribution, melt flow rate and crystallinity have no obvious change with increasing Injection Speed. Nevertheless, the content of extended chain crystals or large folded chain crystals was found to decrease with increasing Injection Speed. Therefore, it is concluded that the decrease in tensile properties is mainly contributed by the reduced content of extended chain crystals or large folded chain crystals. This study provides industry with valuable information for the application of high Speed Injection molding.
Qiang Fu - One of the best experts on this subject based on the ideXlab platform.
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processing condition induced structural evolution in the alternating multi layer structure during high Speed thin wall Injection molding
Polymer, 2016Co-Authors: Yi Zhou, Feilong Yu, Qin Zhang, Hua Deng, Ke Wang, Feng Chen, Qiang FuAbstract:Abstract Polymeric materials with alternating multi-layer structure have gained much attention in the field of biomimic, where many methods were used to prepare materials with such structure for various functionalities. A simple method based on high Speed thin-wall Injection molding (HSTWIM) has been proposed in our previous studies for the easy fabrication of multi-layer functional polymeric materials. Herein, the effect of various Injection processing parameters: Injection distance, Injection Speed, mold temperature and mold thickness on the phase morphology and molecular orientation is studied. The processing condition induced changes in flow field, temperature field, viscosity and shear time are thought to largely influence the confinement of melt during processing, thus, their final phase morphology. It is observed that moderate Injection distance, moderate Injection Speed, moderate mold temperature and thin mold favors the formation of such alternating multi-layer structure. Such study could provide guidelines for the fabrication of functional multi-layered structure through HSTWIM as well as control of phase morphology through confined flow.
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Hierarchy structure in Injection molded polypropylene/ethylene–octane copolymer blends
Journal of Applied Polymer Science, 2007Co-Authors: Jiang Li, Qin Zhang, Xiaoqing Zhang, Cheng Qu, Rongni Du, Qiang FuAbstract:In this article, the phase morphology and mechanical properties of polypropylene (PP)/ethylene–octane copolymer (POE) blends with fixed ratio (60/40) obtained via different processing conditions, including barrel temperature, Injection Speed, and mold temperature, have been investigated. SEM was carried out for detailed characterization of phase morphology from the skin to the core, layer by layer. It was interesting that for all the processing conditions no dispersed POE elastomer was observed in the skin layer but elongated POE particles with large size were observed in the subskin layer. From the transition zone to the core layer, an increased phase separation was observed, which could lead to a formation of cocontinuous morphology, depending on the processing condition used. Higher barrel temperature, lower mold temperature, and higher Injection Speed could result in a smaller size of POE phase. The tensile strength and impact strength were found not sensitive to barrel temperature and mold temperature but to the low Injection Speed, both tensile strength and impact strength had a higher value for specimen obtained via low Injection Speed. The formation of the skin-core morphology and the effect of processing conditions on the phase morphology were discussed based on crystallization kinetics of PP matrix, rheology, and shear induced phase mixing. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007
Qin Zhang - One of the best experts on this subject based on the ideXlab platform.
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processing condition induced structural evolution in the alternating multi layer structure during high Speed thin wall Injection molding
Polymer, 2016Co-Authors: Yi Zhou, Feilong Yu, Qin Zhang, Hua Deng, Ke Wang, Feng Chen, Qiang FuAbstract:Abstract Polymeric materials with alternating multi-layer structure have gained much attention in the field of biomimic, where many methods were used to prepare materials with such structure for various functionalities. A simple method based on high Speed thin-wall Injection molding (HSTWIM) has been proposed in our previous studies for the easy fabrication of multi-layer functional polymeric materials. Herein, the effect of various Injection processing parameters: Injection distance, Injection Speed, mold temperature and mold thickness on the phase morphology and molecular orientation is studied. The processing condition induced changes in flow field, temperature field, viscosity and shear time are thought to largely influence the confinement of melt during processing, thus, their final phase morphology. It is observed that moderate Injection distance, moderate Injection Speed, moderate mold temperature and thin mold favors the formation of such alternating multi-layer structure. Such study could provide guidelines for the fabrication of functional multi-layered structure through HSTWIM as well as control of phase morphology through confined flow.
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HIGH Speed Injection MOLDING OF HIGH DENSITY POLYETHYLENE — EFFECTS OF Injection Speed ON STRUCTURE AND PROPERTIES
Chinese Journal of Polymer Science, 2011Co-Authors: Kun Jiang, Feilong Yu, Qin Zhang, Hua Deng, Ke Wang, Run Su, Jinghui Yang, Tiannan Zhou, Feng ChenAbstract:Thin wall samples of high density polyethylene (HDPE) were prepared via Injection molding with different Injection Speeds ranging from 100 mm/s to 1200 mm/s. A significant decrease in the tensile strength and Young’s modulus was observed with increasing Injection Speed. In order to investigate the mechanism behind this decrease, the orientation, molecular weight, molecular weight distribution, melt flow rate, crystallinity and crystal morphology of HDPE were characterized using two-dimensional wide-angle X-ray diffraction (2D-WAXD), gel permeation chromatography (GPC), capillary rheometry and differential scanning calorimetry (DSC), respectively. It is demonstrated that the orientation, molecular weight, molecular weight distribution, melt flow rate and crystallinity have no obvious change with increasing Injection Speed. Nevertheless, the content of extended chain crystals or large folded chain crystals was found to decrease with increasing Injection Speed. Therefore, it is concluded that the decrease in tensile properties is mainly contributed by the reduced content of extended chain crystals or large folded chain crystals. This study provides industry with valuable information for the application of high Speed Injection molding.
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Hierarchy structure in Injection molded polypropylene/ethylene–octane copolymer blends
Journal of Applied Polymer Science, 2007Co-Authors: Jiang Li, Qin Zhang, Xiaoqing Zhang, Cheng Qu, Rongni Du, Qiang FuAbstract:In this article, the phase morphology and mechanical properties of polypropylene (PP)/ethylene–octane copolymer (POE) blends with fixed ratio (60/40) obtained via different processing conditions, including barrel temperature, Injection Speed, and mold temperature, have been investigated. SEM was carried out for detailed characterization of phase morphology from the skin to the core, layer by layer. It was interesting that for all the processing conditions no dispersed POE elastomer was observed in the skin layer but elongated POE particles with large size were observed in the subskin layer. From the transition zone to the core layer, an increased phase separation was observed, which could lead to a formation of cocontinuous morphology, depending on the processing condition used. Higher barrel temperature, lower mold temperature, and higher Injection Speed could result in a smaller size of POE phase. The tensile strength and impact strength were found not sensitive to barrel temperature and mold temperature but to the low Injection Speed, both tensile strength and impact strength had a higher value for specimen obtained via low Injection Speed. The formation of the skin-core morphology and the effect of processing conditions on the phase morphology were discussed based on crystallization kinetics of PP matrix, rheology, and shear induced phase mixing. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007
Hiroyuki Hamada - One of the best experts on this subject based on the ideXlab platform.
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The effect of Injection Speed on morphology and mechanical properties of Polyoxymethylene/Poly(lactic acid) blends
Energy Procedia, 2014Co-Authors: Suchalinee Mathurosemontri, Putinun Auwongsuwan, Satoshi Nagai, Hiroyuki HamadaAbstract:Abstract Polyoxymethylene (POM)/Poly(lactic acid)(PLA) blends were Injection molded at three different Injection Speeds as 50 mm/s, 100 mm/s and 300 mm/s for investigation the effect of Injection Speed on morphology and mechanical properties of this blends. The tensile test was carried out for examination of mechanical properties. Morphology was observed by polarized optical microscope and polarizing micrographs that was supported by Raman spectra. At Injection Speed of 50 mm/s, mechanical properties of POM/PLA blends increased with decreasing POM content but when 20%wt of POM was added into PLA, the results dropped obviously due to a poor distribution of both POM and PLA phases. That can be confirmed by polarizing micrographs and Raman spectra. It was found that the POM-rich phase mostly combined in the core area. The dispersion of POM-rich phase expanded to a wide area when the Injection Speed increased to 100 mm/s and 300 mm/s, respectively. The improvement of distribution of POM-rich phase has an influence on the enhancement of mechanical properties. Tensile modulus of POM 20 wt.% increased from 2.8 GPa to 3.0 GPa while its tensile strength increased from 50.5 MPa to 55 MPa. Thus, the high Injection Speed can enhanced the phase distribution and mechanical properties at low POM content but has not a significant effect when POM content over 40%wt.
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Effect of molding parameters on the properties of PP/PP sandwich Injection moldings
Polymer Testing, 2005Co-Authors: T. Nagaoka, Hiroyuki Hamada, U.s. Ishiaku, T. Tomari, S. TakashimaAbstract:The basic characteristics of a sandwich Injection molded product depend on the properties of the respective resins that comprise the skin and core layers, and the skin/core resin volume ratio. The characteristics of the core layer resin and the skin/core ratio in particular may vary depending on the Injection molding conditions. This report considers the influences that the molding conditions such as Injection Speed, cylinder temperature, and mold temperature confer on the mechanical properties of the sandwich moldings. The study employed, skin/core resin combinations involving similar and dissimilar materials i.e. homopolymer PP/homopolymer PP and homopolymer PP/copolymer PP, respectively. It was demonstrated that core cylinder temperature and mold temperature could be used to adjust the mechanical properties of sandwich Injection moldings. In the case of single material sandwich moldings, Injection Speed seemed to play no significant role, even though it was clearly demonstrated that core volume increases with Injection Speed. However, core Injection Speed plays a significant role in the dual material system by lowering or increasing the mechanical strength of moldings as the case may be. Thus, the dormant or active role of Injection Speed depending on the material system has been highlighted.
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The effect of Injection Speed on the weld line properties of jute fiber/poly (butylene) succinate biodegradable composites.
2004Co-Authors: Umaru Semo Ishiaku, Yew Wei Leong, O A Khondker, Asami Nakai, Hiroyuki HamadaAbstract:This presentation focuses on effects of Injection Speed and weld line on the properties of PBS/Jute fiber composites. It was found that toughness especially elongation at break is sensitive to the presence of weld line while tensile modulus and flexural properties are little affected. The presence of jute fibers improved toughness i.e. retention of EB and impact strength across the weld line. Ultrahigh Speed Injection facilitated the recovery of EB and hence toughness. Morphological studies with SEM revealed that some of the jute fibers were aligned across the weld line.
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Mechanical properties of ultra high Speed Injection molded parts
2004Co-Authors: Hiroaki Okumura, Machiko Mizoguchi, Susumu Takashima, Satoko Baba, Shigeyuki Nagata, Hiroyuki HamadaAbstract:The first attempt of sandwich Injection molding with ultra-high Speed equipment was described by using Polypropylene as the matrix material. The Injection Speed of core material was 1000mm/sec. The difference of core progressive behavior between low and high Injection Speed was recognized. Also the thickness of skin material decreased with increase of core flow length and finally it reached 150μm. The difference of mechanical properties was not significant.
Hua Deng - One of the best experts on this subject based on the ideXlab platform.
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processing condition induced structural evolution in the alternating multi layer structure during high Speed thin wall Injection molding
Polymer, 2016Co-Authors: Yi Zhou, Feilong Yu, Qin Zhang, Hua Deng, Ke Wang, Feng Chen, Qiang FuAbstract:Abstract Polymeric materials with alternating multi-layer structure have gained much attention in the field of biomimic, where many methods were used to prepare materials with such structure for various functionalities. A simple method based on high Speed thin-wall Injection molding (HSTWIM) has been proposed in our previous studies for the easy fabrication of multi-layer functional polymeric materials. Herein, the effect of various Injection processing parameters: Injection distance, Injection Speed, mold temperature and mold thickness on the phase morphology and molecular orientation is studied. The processing condition induced changes in flow field, temperature field, viscosity and shear time are thought to largely influence the confinement of melt during processing, thus, their final phase morphology. It is observed that moderate Injection distance, moderate Injection Speed, moderate mold temperature and thin mold favors the formation of such alternating multi-layer structure. Such study could provide guidelines for the fabrication of functional multi-layered structure through HSTWIM as well as control of phase morphology through confined flow.
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HIGH Speed Injection MOLDING OF HIGH DENSITY POLYETHYLENE — EFFECTS OF Injection Speed ON STRUCTURE AND PROPERTIES
Chinese Journal of Polymer Science, 2011Co-Authors: Kun Jiang, Feilong Yu, Qin Zhang, Hua Deng, Ke Wang, Run Su, Jinghui Yang, Tiannan Zhou, Feng ChenAbstract:Thin wall samples of high density polyethylene (HDPE) were prepared via Injection molding with different Injection Speeds ranging from 100 mm/s to 1200 mm/s. A significant decrease in the tensile strength and Young’s modulus was observed with increasing Injection Speed. In order to investigate the mechanism behind this decrease, the orientation, molecular weight, molecular weight distribution, melt flow rate, crystallinity and crystal morphology of HDPE were characterized using two-dimensional wide-angle X-ray diffraction (2D-WAXD), gel permeation chromatography (GPC), capillary rheometry and differential scanning calorimetry (DSC), respectively. It is demonstrated that the orientation, molecular weight, molecular weight distribution, melt flow rate and crystallinity have no obvious change with increasing Injection Speed. Nevertheless, the content of extended chain crystals or large folded chain crystals was found to decrease with increasing Injection Speed. Therefore, it is concluded that the decrease in tensile properties is mainly contributed by the reduced content of extended chain crystals or large folded chain crystals. This study provides industry with valuable information for the application of high Speed Injection molding.