The Experts below are selected from a list of 150 Experts worldwide ranked by ideXlab platform
Shinichi Sakurai - One of the best experts on this subject based on the ideXlab platform.
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Structure Model of a Poly(vinyl alcohol) Film Uniaxially Stretched in Water and the Role of Crystallites on the Stress−Strain Relationship
Macromolecules, 2007Co-Authors: Tsukasa Miyazaki, Akie Hoshiko, Midori Akasaka, Miki Sakai, Yuuki Takeda, Shinichi SakuraiAbstract:We propose a structure model of a poly(vinyl alcohol) (PVA) film during uniaxial stretching in water. In addition to the relaxation of microfibrils and the extension of interfibrillar amorphous regions shown in our previous paper, it was described that the strain-induced crystallization takes place in the interfibrillar extended amorphous regions, which bear the increasing stress with strain, by conducting simultaneously the tensile stress−strain Measurement with the wide-angle X-ray diffraction (WAXD) Measurements for the film stretched in water. Furthermore, we examined the dissolution behavior of the PVA film in water by using in-situ WAXD and small-angle X-ray scattering. It was concluded that the dissolution of crystallites in the lamellar stacks, which are considered to be precursors of the microfibrils formed with film stretching, softens the system, as shown with the stress−strain Measurement in water above 333 K, leading to the ineffective amorphous chain extension of PVA molecules.
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SAXS Studies on Structural Changes in a Poly(vinyl alcohol) Film during Uniaxial Stretching in Water
Macromolecules, 2006Co-Authors: Tsukasa Miyazaki, Akie Hoshiko, Midori Akasaka, Takuji Shintani, Shinichi SakuraiAbstract:We have investigated structural changes in a poly(vinyl alcohol) (PVA) film during uniaxial stretching in water by conducting simultaneously the tensile stress−strain Measurement with small-angle X...
Jitladda Sakdapipanich - One of the best experts on this subject based on the ideXlab platform.
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the effects of endlinking network and entanglement to stress strain relation and strain induced crystallization of un vulcanized and vulcanized natural rubber
Polymer, 2012Co-Authors: Sureerut Amnuaypornsri, Shigeyuki Toki, Benjamin S Hsiao, Jitladda SakdapipanichAbstract:Abstract Simultaneous synchrotron X-ray and Stress-Strain Measurement of un-vulcanized natural rubber (NR) revealed that an upturn of stress at large strains and strain induced crystallization (SIC) are caused by endlinking pseudo network and entanglements. Higher pseudo network density of un-vulcanized NR shows higher modulus and larger fraction of SIC. At faster stretching speed, un-vulcanized NR shows higher stress and larger fraction of SIC. On the other hand, vulcanized NR show almost the same Stress-Strain relation and smaller fraction of SIC at faster stretching speed. Those different behaviors are governed by entanglements, endlinking pseudo networks in un-vulcanized NR and chemical bond networks, small amount of entanglements and endlinking networks in vulcanized NR.
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The effects of endlinking network and entanglement to stress–strain relation and strain-induced crystallization of un-vulcanized and vulcanized natural rubber
Polymer, 2012Co-Authors: Sureerut Amnuaypornsri, Shigeyuki Toki, Benjamin S Hsiao, Jitladda SakdapipanichAbstract:Abstract Simultaneous synchrotron X-ray and Stress-Strain Measurement of un-vulcanized natural rubber (NR) revealed that an upturn of stress at large strains and strain induced crystallization (SIC) are caused by endlinking pseudo network and entanglements. Higher pseudo network density of un-vulcanized NR shows higher modulus and larger fraction of SIC. At faster stretching speed, un-vulcanized NR shows higher stress and larger fraction of SIC. On the other hand, vulcanized NR show almost the same Stress-Strain relation and smaller fraction of SIC at faster stretching speed. Those different behaviors are governed by entanglements, endlinking pseudo networks in un-vulcanized NR and chemical bond networks, small amount of entanglements and endlinking networks in vulcanized NR.
Tsukasa Miyazaki - One of the best experts on this subject based on the ideXlab platform.
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Structure Model of a Poly(vinyl alcohol) Film Uniaxially Stretched in Water and the Role of Crystallites on the Stress−Strain Relationship
Macromolecules, 2007Co-Authors: Tsukasa Miyazaki, Akie Hoshiko, Midori Akasaka, Miki Sakai, Yuuki Takeda, Shinichi SakuraiAbstract:We propose a structure model of a poly(vinyl alcohol) (PVA) film during uniaxial stretching in water. In addition to the relaxation of microfibrils and the extension of interfibrillar amorphous regions shown in our previous paper, it was described that the strain-induced crystallization takes place in the interfibrillar extended amorphous regions, which bear the increasing stress with strain, by conducting simultaneously the tensile stress−strain Measurement with the wide-angle X-ray diffraction (WAXD) Measurements for the film stretched in water. Furthermore, we examined the dissolution behavior of the PVA film in water by using in-situ WAXD and small-angle X-ray scattering. It was concluded that the dissolution of crystallites in the lamellar stacks, which are considered to be precursors of the microfibrils formed with film stretching, softens the system, as shown with the stress−strain Measurement in water above 333 K, leading to the ineffective amorphous chain extension of PVA molecules.
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SAXS Studies on Structural Changes in a Poly(vinyl alcohol) Film during Uniaxial Stretching in Water
Macromolecules, 2006Co-Authors: Tsukasa Miyazaki, Akie Hoshiko, Midori Akasaka, Takuji Shintani, Shinichi SakuraiAbstract:We have investigated structural changes in a poly(vinyl alcohol) (PVA) film during uniaxial stretching in water by conducting simultaneously the tensile stress−strain Measurement with small-angle X...
Sureerut Amnuaypornsri - One of the best experts on this subject based on the ideXlab platform.
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the effects of endlinking network and entanglement to stress strain relation and strain induced crystallization of un vulcanized and vulcanized natural rubber
Polymer, 2012Co-Authors: Sureerut Amnuaypornsri, Shigeyuki Toki, Benjamin S Hsiao, Jitladda SakdapipanichAbstract:Abstract Simultaneous synchrotron X-ray and Stress-Strain Measurement of un-vulcanized natural rubber (NR) revealed that an upturn of stress at large strains and strain induced crystallization (SIC) are caused by endlinking pseudo network and entanglements. Higher pseudo network density of un-vulcanized NR shows higher modulus and larger fraction of SIC. At faster stretching speed, un-vulcanized NR shows higher stress and larger fraction of SIC. On the other hand, vulcanized NR show almost the same Stress-Strain relation and smaller fraction of SIC at faster stretching speed. Those different behaviors are governed by entanglements, endlinking pseudo networks in un-vulcanized NR and chemical bond networks, small amount of entanglements and endlinking networks in vulcanized NR.
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The effects of endlinking network and entanglement to stress–strain relation and strain-induced crystallization of un-vulcanized and vulcanized natural rubber
Polymer, 2012Co-Authors: Sureerut Amnuaypornsri, Shigeyuki Toki, Benjamin S Hsiao, Jitladda SakdapipanichAbstract:Abstract Simultaneous synchrotron X-ray and Stress-Strain Measurement of un-vulcanized natural rubber (NR) revealed that an upturn of stress at large strains and strain induced crystallization (SIC) are caused by endlinking pseudo network and entanglements. Higher pseudo network density of un-vulcanized NR shows higher modulus and larger fraction of SIC. At faster stretching speed, un-vulcanized NR shows higher stress and larger fraction of SIC. On the other hand, vulcanized NR show almost the same Stress-Strain relation and smaller fraction of SIC at faster stretching speed. Those different behaviors are governed by entanglements, endlinking pseudo networks in un-vulcanized NR and chemical bond networks, small amount of entanglements and endlinking networks in vulcanized NR.
Akie Hoshiko - One of the best experts on this subject based on the ideXlab platform.
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Structure Model of a Poly(vinyl alcohol) Film Uniaxially Stretched in Water and the Role of Crystallites on the Stress−Strain Relationship
Macromolecules, 2007Co-Authors: Tsukasa Miyazaki, Akie Hoshiko, Midori Akasaka, Miki Sakai, Yuuki Takeda, Shinichi SakuraiAbstract:We propose a structure model of a poly(vinyl alcohol) (PVA) film during uniaxial stretching in water. In addition to the relaxation of microfibrils and the extension of interfibrillar amorphous regions shown in our previous paper, it was described that the strain-induced crystallization takes place in the interfibrillar extended amorphous regions, which bear the increasing stress with strain, by conducting simultaneously the tensile stress−strain Measurement with the wide-angle X-ray diffraction (WAXD) Measurements for the film stretched in water. Furthermore, we examined the dissolution behavior of the PVA film in water by using in-situ WAXD and small-angle X-ray scattering. It was concluded that the dissolution of crystallites in the lamellar stacks, which are considered to be precursors of the microfibrils formed with film stretching, softens the system, as shown with the stress−strain Measurement in water above 333 K, leading to the ineffective amorphous chain extension of PVA molecules.
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SAXS Studies on Structural Changes in a Poly(vinyl alcohol) Film during Uniaxial Stretching in Water
Macromolecules, 2006Co-Authors: Tsukasa Miyazaki, Akie Hoshiko, Midori Akasaka, Takuji Shintani, Shinichi SakuraiAbstract:We have investigated structural changes in a poly(vinyl alcohol) (PVA) film during uniaxial stretching in water by conducting simultaneously the tensile stress−strain Measurement with small-angle X...