会议专题

CRYSTALLINE POLYMORPHISM AND CRYSTALLIZATION PROCESSES OF POLYMERS

Introduction. Crystallization processes of polymers are more complex than those of small molecules, given their long chain nature. Indeed, the growth of the polymer crystals cannot be conceived as the aggregation onto the growth front of identical, whole (small) molecules. Buildup of the polymer crystal involves building blocks that are only fractions of the whole chain, namely the stems, Yet crystals of polymers share many features of crystals of smaller molecules: growth faces, growth kinetics, etc. In attempting to analyze the details of any crystallization processes, formation of different crystalline phases for the same polymeric species can be of considerable help. Indeed, the initial state the polymer melt-is similar in all cases, whereas the final result may be significantly different in terms of chain conformation, cell geometry and/or symmetry, growth kinetics, spherulite structure, etc. The present contribution illustrates several examples of polymorphism in polymer science, and analyzes significant transformation processes between different crystal phases as well as differences in the growth of these forms. When correctly analyzed, these differences may well shed light on elementary polymer crystallization processes.

Bernard Lotz

Institut Charles Sadron,23,Rue du Loess,67034 Strasbourg Cedex 2,France

国际会议

International Symposium on Polymer Physics(2008年国际高分子物理学术会议PP2008)

厦门

英文

17-18

2008-06-08(万方平台首次上网日期,不代表论文的发表时间)