nelly rahman - Academia.edu (original) (raw)

Papers by nelly rahman

Kyoto University (京都大学)0048新制・課程博士博士(工学)甲第14652号工博第3120号新制||工||1464(附属図書館)UT51-2009-D364京都大学大学院工学... more Kyoto University (京都大学)0048新制・課程博士博士(工学)甲第14652号工博第3120号新制||工||1464(附属図書館)UT51-2009-D364京都大学大学院工学研究科高分子化学専攻(主査)教授 金谷 利治, 教授 吉﨑 武尚, 教授 大嶋 正裕学位規則第4条第1項該

Polymer, 2003

To investigate the mechanism of high elongation of natural rubber attained by the 'racking method... more To investigate the mechanism of high elongation of natural rubber attained by the 'racking method', a strip of smoked-sheet was elongated up to 150 times in length, by stretching rapidly at room temperature and forcing to shrink at 75-80 8C repeatedly. On X-ray diffraction, a typical fibre pattern with an amorphous ring appeared already at £ 10 (stretch ratio ¼ 10). The degree of crystallinity increased to the level of 17-18% at £ 20 and turned to decrease after £ 60, but the degree of crystallite orientation reached at a high level already at £ 10 and did not change significantly and the half-height width of reflection profiles stayed almost at a constant level, while the Young's modulus increased up to ca. 300 MPa at £ 100 and then fell rather discontinuously. It was assumed that some fractions of chain segments between entanglements were gradually broken in each step of stretching operation, rather than disentangled and slipped.

Macromolecules, 2007

... Takahiko Kawai,* † Nelly Rahman, † Go Matsuba, † Koji Nishida, † Toshiji Kanaya, † Mitsuru Na... more ... Takahiko Kawai,* † Nelly Rahman, † Go Matsuba, † Koji Nishida, † Toshiji Kanaya, † Mitsuru Nakano, ‡ Hirotaka Okamoto, ‡ Jumpei Kawada, ‡ Arimitsu Usuki, ‡ Nobutaka Honma, § Katsuhiko Nakajima, § and Masatoshi Matsuda §. ...

Journal of Applied Polymer Science, 2009

Aiming at the improvement of mechanical and dielectric properties of poly(vinyl alcohol) (PVA), w... more Aiming at the improvement of mechanical and dielectric properties of poly(vinyl alcohol) (PVA), we prepared composites of PVA and magnesium nitrate hexahydrate. It was found that the composites were very soft and rubber-like, and the glass transition temperature decreased with increasing the salt concentration. Wide-angle X-ray diffraction and small-angle X-ray scattering revealed that the crystallites of PVA were destroyed by the additive and it was the cause of the softening. V

…, 2009

... Takahiko Kawai*‡, Go Matsuba†, Koji Nishida†, Toshiji Kanaya†, Hiroshi Watanabe†, HirotakaOka... more ... Takahiko Kawai*‡, Go Matsuba†, Koji Nishida†, Toshiji Kanaya†, Hiroshi Watanabe†, HirotakaOkamoto§, Makoto Kato§, Arimitsu Usuki§, Masatoshi Matsuda , Katsuhiko Nakajima and Nobutaka Honma. ... 2. Nam, JY ; Okamoto, M. ; Okamoto, H. ; Nakano, M. ; Usuki, A. ; Matsda ...

Kyoto University (京都大学)0048新制・課程博士博士(工学)甲第14652号工博第3120号新制||工||1464(附属図書館)UT51-2009-D364京都大学大学院工学... more Kyoto University (京都大学)0048新制・課程博士博士(工学)甲第14652号工博第3120号新制||工||1464(附属図書館)UT51-2009-D364京都大学大学院工学研究科高分子化学専攻(主査)教授 金谷 利治, 教授 吉﨑 武尚, 教授 大嶋 正裕学位規則第4条第1項該

Polymer, 2003

To investigate the mechanism of high elongation of natural rubber attained by the 'racking method... more To investigate the mechanism of high elongation of natural rubber attained by the 'racking method', a strip of smoked-sheet was elongated up to 150 times in length, by stretching rapidly at room temperature and forcing to shrink at 75-80 8C repeatedly. On X-ray diffraction, a typical fibre pattern with an amorphous ring appeared already at £ 10 (stretch ratio ¼ 10). The degree of crystallinity increased to the level of 17-18% at £ 20 and turned to decrease after £ 60, but the degree of crystallite orientation reached at a high level already at £ 10 and did not change significantly and the half-height width of reflection profiles stayed almost at a constant level, while the Young's modulus increased up to ca. 300 MPa at £ 100 and then fell rather discontinuously. It was assumed that some fractions of chain segments between entanglements were gradually broken in each step of stretching operation, rather than disentangled and slipped.

Macromolecules, 2007

... Takahiko Kawai,* † Nelly Rahman, † Go Matsuba, † Koji Nishida, † Toshiji Kanaya, † Mitsuru Na... more ... Takahiko Kawai,* † Nelly Rahman, † Go Matsuba, † Koji Nishida, † Toshiji Kanaya, † Mitsuru Nakano, ‡ Hirotaka Okamoto, ‡ Jumpei Kawada, ‡ Arimitsu Usuki, ‡ Nobutaka Honma, § Katsuhiko Nakajima, § and Masatoshi Matsuda §. ...

Journal of Applied Polymer Science, 2009

Aiming at the improvement of mechanical and dielectric properties of poly(vinyl alcohol) (PVA), w... more Aiming at the improvement of mechanical and dielectric properties of poly(vinyl alcohol) (PVA), we prepared composites of PVA and magnesium nitrate hexahydrate. It was found that the composites were very soft and rubber-like, and the glass transition temperature decreased with increasing the salt concentration. Wide-angle X-ray diffraction and small-angle X-ray scattering revealed that the crystallites of PVA were destroyed by the additive and it was the cause of the softening. V

…, 2009

... Takahiko Kawai*‡, Go Matsuba†, Koji Nishida†, Toshiji Kanaya†, Hiroshi Watanabe†, HirotakaOka... more ... Takahiko Kawai*‡, Go Matsuba†, Koji Nishida†, Toshiji Kanaya†, Hiroshi Watanabe†, HirotakaOkamoto§, Makoto Kato§, Arimitsu Usuki§, Masatoshi Matsuda , Katsuhiko Nakajima and Nobutaka Honma. ... 2. Nam, JY ; Okamoto, M. ; Okamoto, H. ; Nakano, M. ; Usuki, A. ; Matsda ...