caa a22 4500 475764544 CHVBK 20180406123601.0 cr unu---uuuuu 170329e20000401xx s 000 0 eng 10.1007/s003960050524 doi (NATIONALLICENCE)springer-10.1007/s003960050524 A segment concept in the dissolution of stereoregular isotactic polyacrylonitrile into three dinitrile solvents, CN-(CH2) n -CN ( n  = 1, 2, and 3), at elevated temperatures [Elektronische Daten] [M. Minagawa, K. Hashimoto, H. Shirai, T. Morita, F. Yoshii] The dependence of the dissolution temperature (T sol) of isotactic polyacrylonitrile (PAN) on tacticity was studied for three dinitrile solvents. A linear relationship was obtained in the inverse plots of the tacticity dependence of the T sol of PAN. A phenomenological analogy between the tacticity dependence of the T sol of isotactic PAN and the molecular-weight dependence of the glass-transition temperature of amorphous polystyrene is discussed from a thermodynamic point of view. The linear relationships in both phenomena are explained in terms of a common mechanism: a breakdown of thermodynamic competition, enthalpy, and entropy through the segment mobility. The significance of segment concept and molecular mobility at elevated temperatures are discussed. Springer-Verlag Berlin Heidelberg, 2000 Key words Isotactic polyacrylonitrile nationallicence High-temperature dissolution nationallicence Dinitrile solvents nationallicence Segment mobility nationallicence Minagawa M. Department of Materials Science and Engineering Faculty of Engineering Yamagata University Yonezawa 992-8510, Japan, JP aut Hashimoto K. Department of Materials Science and Engineering Faculty of Engineering Yamagata University Yonezawa 992-8510, Japan, JP aut Shirai H. Department of Materials Science and Engineering Faculty of Engineering Yamagata University Yonezawa 992-8510, Japan, JP aut Morita T. Department of Materials Science and Engineering Faculty of Engineering Yamagata University Yonezawa 992-8510, Japan, JP aut Yoshii F. Takasaki Radiation Chemistry Research Establishment, Japan Atomic Energy Research Institute Takasaki 370-1292, Japan, JP aut https://doi.org/10.1007/s003960050524 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960050524 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Minagawa M. Department of Materials Science and Engineering Faculty of Engineering Yamagata University Yonezawa 992-8510, Japan, JP aut NATIONALLICENCE 700 1- Hashimoto K. Department of Materials Science and Engineering Faculty of Engineering Yamagata University Yonezawa 992-8510, Japan, JP aut NATIONALLICENCE 700 1- Shirai H. Department of Materials Science and Engineering Faculty of Engineering Yamagata University Yonezawa 992-8510, Japan, JP aut NATIONALLICENCE 700 1- Morita T. Department of Materials Science and Engineering Faculty of Engineering Yamagata University Yonezawa 992-8510, Japan, JP aut NATIONALLICENCE 700 1- Yoshii F. Takasaki Radiation Chemistry Research Establishment, Japan Atomic Energy Research Institute Takasaki 370-1292, Japan, JP aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer