Effect of coagulation conditions on crystal modification of poly(p-phenylene terephthalamide)

聚对苯撑 范德瓦尔斯力 晶体结构 材料科学 高分子化学 退火(玻璃) 亚苯基 表面改性 分子 化学工程 聚合物 化学 结晶学 有机化学 物理化学 复合材料 工程类
作者
Kazutoshi Haraguchi,Tisato Kajiyama,Motowo Takayanagi
出处
期刊:Journal of Applied Polymer Science [Wiley]
卷期号:23 (3): 915-926 被引量:85
标识
DOI:10.1002/app.1979.070230326
摘要

Abstract Poly( p ‐phenylene terephthalamide)(PTTA) films were prepared from sulfuric acid solution with various coagulants. X‐ray diffraction and infrared absorption measurements revealed that the crystal structure of the film coagulated with water showed a new crystal modification II, which was different from the one previously reported by Northolt and Tadokoro et al. The latter structure is called here modification I. Modification II coagulated with water from a solution of lower polymer concentration irreversibly transformed to modification I upon annealing, whereas modification II prepared from highly concentrated solution was thermally stable and scarcely transformed to modification I upon annealing. A liquid crystal‐like swollen structure was found in the intermediate stage of the formation of modification II. In this swollen state, x‐ray diffraction revealed that water molecules are included in hydrogen‐bonded planes and the intermolecular spacing along the van der Waals force direction was unaffected by the existence of the water and remained constant throughout the process of regeneration. Both modifications I and II were found to be stable on treatment with boiling solvents. The transformation of the swollen structure to modification I took place in boiling methanol and acetone.
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