The Experts below are selected from a list of 6315 Experts worldwide ranked by ideXlab platform
Takashi Inoue - One of the best experts on this subject based on the ideXlab platform.
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dual Lamellar Crystal structure in poly vinylidene fluoride acrylic rubber blends and its biaxial orientation behavior
Polymer, 2006Co-Authors: Yongjin Li, Yuko Oono, Kazuo Nakayama, Hiroshi Shimizu, Takashi InoueAbstract:Abstract The miscibility for melt-mixed poly(vinylidene fluoride) (PVDF)/acrylic rubber (ACM) blends and the Crystal morphology of PVDF in the blends were investigated over the whole composition ranges by dynamic mechanical analysis (DMA), wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM). DMA measurements revealed that PVDF is miscible with ACM in ACM-rich system, and partially miscible in PVDF-rich system. Two kinds of PVDF Lamellar structures with different long periods were detected by SAXS and TEM for the partially miscible blends. In the miscible system, only one kind of Crystal lamellae with enlarged long period is found. The two kinds of Lamellar structures in the blend show different orientation behavior during the uniaxial stretching to result in a biaxial orientation. The lamellae with short long period are oriented vertical to the stretching direction, while those with large long period were found to be oriented parallel to the stretching direction.
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dual Lamellar Crystal structure in poly vinylidene fluoride acrylic rubber blends and its biaxial orientation behavior
Polymer, 2006Co-Authors: Yongjin Li, Yuko Oono, Kazuo Nakayama, Hiroshi Shimizu, Takashi InoueAbstract:Abstract The miscibility for melt-mixed poly(vinylidene fluoride) (PVDF)/acrylic rubber (ACM) blends and the Crystal morphology of PVDF in the blends were investigated over the whole composition ranges by dynamic mechanical analysis (DMA), wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM). DMA measurements revealed that PVDF is miscible with ACM in ACM-rich system, and partially miscible in PVDF-rich system. Two kinds of PVDF Lamellar structures with different long periods were detected by SAXS and TEM for the partially miscible blends. In the miscible system, only one kind of Crystal lamellae with enlarged long period is found. The two kinds of Lamellar structures in the blend show different orientation behavior during the uniaxial stretching to result in a biaxial orientation. The lamellae with short long period are oriented vertical to the stretching direction, while those with large long period were found to be oriented parallel to the stretching direction.
Yongjin Li - One of the best experts on this subject based on the ideXlab platform.
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dual Lamellar Crystal structure in poly vinylidene fluoride acrylic rubber blends and its biaxial orientation behavior
Polymer, 2006Co-Authors: Yongjin Li, Yuko Oono, Kazuo Nakayama, Hiroshi Shimizu, Takashi InoueAbstract:Abstract The miscibility for melt-mixed poly(vinylidene fluoride) (PVDF)/acrylic rubber (ACM) blends and the Crystal morphology of PVDF in the blends were investigated over the whole composition ranges by dynamic mechanical analysis (DMA), wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM). DMA measurements revealed that PVDF is miscible with ACM in ACM-rich system, and partially miscible in PVDF-rich system. Two kinds of PVDF Lamellar structures with different long periods were detected by SAXS and TEM for the partially miscible blends. In the miscible system, only one kind of Crystal lamellae with enlarged long period is found. The two kinds of Lamellar structures in the blend show different orientation behavior during the uniaxial stretching to result in a biaxial orientation. The lamellae with short long period are oriented vertical to the stretching direction, while those with large long period were found to be oriented parallel to the stretching direction.
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dual Lamellar Crystal structure in poly vinylidene fluoride acrylic rubber blends and its biaxial orientation behavior
Polymer, 2006Co-Authors: Yongjin Li, Yuko Oono, Kazuo Nakayama, Hiroshi Shimizu, Takashi InoueAbstract:Abstract The miscibility for melt-mixed poly(vinylidene fluoride) (PVDF)/acrylic rubber (ACM) blends and the Crystal morphology of PVDF in the blends were investigated over the whole composition ranges by dynamic mechanical analysis (DMA), wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM). DMA measurements revealed that PVDF is miscible with ACM in ACM-rich system, and partially miscible in PVDF-rich system. Two kinds of PVDF Lamellar structures with different long periods were detected by SAXS and TEM for the partially miscible blends. In the miscible system, only one kind of Crystal lamellae with enlarged long period is found. The two kinds of Lamellar structures in the blend show different orientation behavior during the uniaxial stretching to result in a biaxial orientation. The lamellae with short long period are oriented vertical to the stretching direction, while those with large long period were found to be oriented parallel to the stretching direction.
Peter J Quinn - One of the best experts on this subject based on the ideXlab platform.
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phase behavior of dipalmitoylphosphatidylethanolamine in dimethylsulfoxide water mixture
Thermochimica Acta, 2004Co-Authors: Lin Chen, Zhiwu Yu, Peter J QuinnAbstract:Abstract The phase behaviors of dipalmitoylphosphatidylethanolamine (DPPE) dispersed in dimethyl sulfoxide (DMSO) aqueous solutions were studied by using differential scanning calorimetry and X-ray diffraction methods. At low concentration of DMSO (mole fraction, x −1 . The formation of the stable Lamellar-Crystal phase from the metastable Lamellar-gel phase needs long time incubation. At moderate concentration of DMSO (0.2 x x >0.37), DMSO promotes remarkably the formation of Lamellar-Crystal phase of the lipid, resulting in phase transitions between Lamellar-Crystal phase and liquid-Crystal phase during heating/cooling cycling. A phase diagram has been constructed over the entire concentration range of the mixed solvent. In addition, it was found that DMSO could decrease the Lamellar repeat spacing of Crystalline and liquid Crystalline phase.
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the kinetics and mechanism of the formation of Crystalline phase of dipalmitoylphosphatidylethanolamine dispersed in aqueous dimethyl sulfoxide solutions
Chemistry and Physics of Lipids, 2004Co-Authors: Lin Chen, Zhiwu Yu, Peter J QuinnAbstract:The phase transition kinetics and mechanism of formation of a Lamellar-Crystalline phase of dipalmitoylphosphatidylethanolamine (DPPE) dispersed in different concentrations of aqueous dimethyl sulfoxide (DMSO) during cooling have been examined by differential scanning calorimetry and synchrotron X-ray diffraction techniques. In dispersions containing mole fractions of DMSO ( x 0.5 resulted in a direct transition from liquid-Crystal phase to Lamellar Crystal phase with no detectable intermediate gel phase. A temperature versus DMSO concentration phase diagram was constructed based on calorimetric data with phase assignments made using synchrotron X-ray diffraction measurements. The non-isothermal formation kinetics of the Lamellar Crystal phase, which is expressed as the half time of the transformation process, was found to depend on DMSO concentration. The inducement of Lamellar Crystal phase in DPPE by DMSO is discussed in terms of the dehydration effect of DMSO and competitive molecular interactions between DMSO, water, and the phospholipid. © 2003 Elsevier Ireland Ltd. All rights reserved.
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the effect of alpha tocopherol on the thermotropic phase behaviour of dipalmitoylphosphatidylethanolamine a synchrotron x ray diffraction study
FEBS Journal, 1999Co-Authors: Xiaoyuan Wang, Peter J QuinnAbstract:The effect of α-tocopherol on the thermotropic phase behaviour of aqueous dispersions of dipalmitoylphosphatidylethanolamine in mixtures containing 0, 2.5, 5, 10 and 20 mol% α-tocopherol was examined using synchrotron X-ray diffraction methods. Dispersions were equilibrated for at least 12 h at 4 °C before measurement. The phospholipid alone undergoes a Lamellar gel to liquid-Crystalline phase transition at 66 °C during the initial heating scan. When codispersed with α-tocopherol there was evidence of phase separation of α-tocopherol-rich domains from bilayers of pure phospholipid. The α-tocopherol-rich domains were identified from the relationship between scattering intensity of the phase and the proportion of α-tocopherol in the mixture. In initial heating scans α-tocopherol-rich domains were characterized by broad Lamellar repeat spacings (5.0 nm at 55 °C) in the small-angle scattering region which first appears at ≈ 40 °C and increases in intensity with increasing temperature. In the presence of more than 5 mol% α-tocopherol the wide-angle scattering region showed two scattering profiles consisting of multiple peaks typical of Lamellar Crystal phases. The low-temperature Crystal phase, designated Lc1, was transformed into Lc2 phase at ≈ 50 °C. On further heating the Lc2 phase was transformed directly into inverted hexagonal phase at ≈56 °C and coexisted with the Lamellar gel phase of the pure phospholipid. The inverted hexagonal phase coexists with the Lamellar phase of the pure phospholipid, after transformation into Lamellar liquid-Crystal phase at 66 °C, at least up to 70 °C. In cooling scans the d-spacing of the inverted hexagonal phase decreases progressively and the scattering intensity weakens on cooling below the liquid-Crystal to gel phase transition temperature of the pure phospholipid. There is no evidence of formation of Lamellar Crystal phases during cooling so that the α-tocopherol either mixes with the Lamellar gel phase of the phospholipid without change in the structural parameters of the pure phospholipid or is completely phase separated from the phospholipid. The stoichiometry of phospholipid/α-tocopherol in the α-tocopherol-rich Lamellar Crystal and inverted hexagonal phases is estimated to be ≈ 4 : 1. The structural changes observed in the study are related to the calorimetric transitions reported in independent work on these dispersions.
Yuko Oono - One of the best experts on this subject based on the ideXlab platform.
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dual Lamellar Crystal structure in poly vinylidene fluoride acrylic rubber blends and its biaxial orientation behavior
Polymer, 2006Co-Authors: Yongjin Li, Yuko Oono, Kazuo Nakayama, Hiroshi Shimizu, Takashi InoueAbstract:Abstract The miscibility for melt-mixed poly(vinylidene fluoride) (PVDF)/acrylic rubber (ACM) blends and the Crystal morphology of PVDF in the blends were investigated over the whole composition ranges by dynamic mechanical analysis (DMA), wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM). DMA measurements revealed that PVDF is miscible with ACM in ACM-rich system, and partially miscible in PVDF-rich system. Two kinds of PVDF Lamellar structures with different long periods were detected by SAXS and TEM for the partially miscible blends. In the miscible system, only one kind of Crystal lamellae with enlarged long period is found. The two kinds of Lamellar structures in the blend show different orientation behavior during the uniaxial stretching to result in a biaxial orientation. The lamellae with short long period are oriented vertical to the stretching direction, while those with large long period were found to be oriented parallel to the stretching direction.
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dual Lamellar Crystal structure in poly vinylidene fluoride acrylic rubber blends and its biaxial orientation behavior
Polymer, 2006Co-Authors: Yongjin Li, Yuko Oono, Kazuo Nakayama, Hiroshi Shimizu, Takashi InoueAbstract:Abstract The miscibility for melt-mixed poly(vinylidene fluoride) (PVDF)/acrylic rubber (ACM) blends and the Crystal morphology of PVDF in the blends were investigated over the whole composition ranges by dynamic mechanical analysis (DMA), wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM). DMA measurements revealed that PVDF is miscible with ACM in ACM-rich system, and partially miscible in PVDF-rich system. Two kinds of PVDF Lamellar structures with different long periods were detected by SAXS and TEM for the partially miscible blends. In the miscible system, only one kind of Crystal lamellae with enlarged long period is found. The two kinds of Lamellar structures in the blend show different orientation behavior during the uniaxial stretching to result in a biaxial orientation. The lamellae with short long period are oriented vertical to the stretching direction, while those with large long period were found to be oriented parallel to the stretching direction.
Kazuo Nakayama - One of the best experts on this subject based on the ideXlab platform.
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dual Lamellar Crystal structure in poly vinylidene fluoride acrylic rubber blends and its biaxial orientation behavior
Polymer, 2006Co-Authors: Yongjin Li, Yuko Oono, Kazuo Nakayama, Hiroshi Shimizu, Takashi InoueAbstract:Abstract The miscibility for melt-mixed poly(vinylidene fluoride) (PVDF)/acrylic rubber (ACM) blends and the Crystal morphology of PVDF in the blends were investigated over the whole composition ranges by dynamic mechanical analysis (DMA), wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM). DMA measurements revealed that PVDF is miscible with ACM in ACM-rich system, and partially miscible in PVDF-rich system. Two kinds of PVDF Lamellar structures with different long periods were detected by SAXS and TEM for the partially miscible blends. In the miscible system, only one kind of Crystal lamellae with enlarged long period is found. The two kinds of Lamellar structures in the blend show different orientation behavior during the uniaxial stretching to result in a biaxial orientation. The lamellae with short long period are oriented vertical to the stretching direction, while those with large long period were found to be oriented parallel to the stretching direction.
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dual Lamellar Crystal structure in poly vinylidene fluoride acrylic rubber blends and its biaxial orientation behavior
Polymer, 2006Co-Authors: Yongjin Li, Yuko Oono, Kazuo Nakayama, Hiroshi Shimizu, Takashi InoueAbstract:Abstract The miscibility for melt-mixed poly(vinylidene fluoride) (PVDF)/acrylic rubber (ACM) blends and the Crystal morphology of PVDF in the blends were investigated over the whole composition ranges by dynamic mechanical analysis (DMA), wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM). DMA measurements revealed that PVDF is miscible with ACM in ACM-rich system, and partially miscible in PVDF-rich system. Two kinds of PVDF Lamellar structures with different long periods were detected by SAXS and TEM for the partially miscible blends. In the miscible system, only one kind of Crystal lamellae with enlarged long period is found. The two kinds of Lamellar structures in the blend show different orientation behavior during the uniaxial stretching to result in a biaxial orientation. The lamellae with short long period are oriented vertical to the stretching direction, while those with large long period were found to be oriented parallel to the stretching direction.
