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Studies on macromolecular entanglement. II. Modification of macromolecular entanglements by heat treatment
Author(s) -
Qian Baojun,
Wu Zongquan,
Hu Panpan,
Qin Jian,
Wu Chengxun,
Zhao Jiongxin
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070471018
Subject(s) - macromolecule , polyacrylonitrile , quantum entanglement , crystallization , polymer , copolymer , materials science , polymer science , polymer chemistry , chemistry , composite material , organic chemistry , physics , biochemistry , quantum mechanics , quantum
The modifications of macromolecular entanglements in polyacrylonitrile copolymer fibers by heat setting in different mediums such as steam, hot air, and inert liquid are reported. The effects of applied tension, frozen internal stress, temperature, time, medium, crystallization, etc., during heat setting on the modification of entanglements are investigated in detail. These experimental results elucidate clearly the mechanism of entanglement and disentanglement and confirm fully the DSC method of swelling polymers for studying entanglement in solid polymer, as was previously published in Part I of this paper. © 1993 John Wiley & Sons, Inc.