Determination of Sharpness of Order-Disorder Transition of Block Copolymers by Scattering Methods

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概要

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• It has been considered that elastic scattering profiles gradually change with temperature across the order-disorder transition (ODT) of block copolymers and hence a unique determination of the ODT temperature (T_<ODT>) is difficult by scattering methods alone. We report here our finding that the scattering experiments with a high temperature-resolution, involving a temperature increment of smaller than or equal to 1℃, enables a straightforward, unequivocal determination of T_<ODT> even for a low molecular weight polystyrene-block-polyisoprene copolymer. Moreover we found that the high temperature-resolution scattering experiment can reveal the very sharp ODT of the copolymer occurring in a very narrow temperature range of less than 1℃ ; the experimental results with a low temperature-resolution can easily lead us to overlook the sharpness of the ODT and to misunderstand the nature of the transition.

• 社団法人日本物理学会の論文
• 1994-06-15

著者

• HAN Chang

  Department of Orthopedic Surgery, College of Medicine, The Catholic University of Korea

• Hashimoto Takeji

  Division Of Polymer Chemistry Graduate School Of Engineering Kyoto University

• Ogawa Toshihiro

  Division Of Polymer Chemistry Graduate School Of Engineering Kyoto University

• Han Chang

  Department Of Polymer Engineering And Institute Of Polymer Engineering The University Of Akron

• Han Chang

  Department Of Electronics & Computer Engineering Dong-a University

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