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Colloid and Polymer Science

, Volume 278, Issue 4, pp 352–357 | Cite as

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

  • M. Minagawa
  • K. Hashimoto
  • H. Shirai
  • T. Morita
  • F. Yoshii
ORIGINAL CONTRIBUTION

Abstract

The dependence of the dissolution temperature (Tsol) 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 Tsol of PAN. A phenomenological analogy between the tacticity dependence of the Tsol 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.

Key words Isotactic polyacrylonitrile High-temperature dissolution Dinitrile solvents Segment mobility 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • M. Minagawa
    • 1
  • K. Hashimoto
    • 1
  • H. Shirai
    • 1
  • T. Morita
    • 1
  • F. Yoshii
    • 2
  1. 1.Department of Materials Science and Engineering Faculty of Engineering Yamagata University Yonezawa 992-8510, JapanJP
  2. 2.Takasaki Radiation Chemistry Research Establishment, Japan Atomic Energy Research Institute Takasaki 370-1292, JapanJP

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