聚对苯甲酰胺薄膜的结构

THE STRUCTURES OF FILMS OF POLY( p BENZAMIDE)

聚对苯甲酰胺溶于ＤＭＳＯＮａＨ系中，变成聚合物阴离子，形成均相溶液．从此溶液中蒸发掉ＤＭＳＯ，用有机溶剂再生后获得再生薄膜．室温下干燥的薄膜基本上是无定形的，１３０℃的热处理对薄膜的结构几乎不发生大的影响，２５０℃或者３００℃的热处理后，薄膜的结构由无定性变成结晶１型及新的结晶２型．与结晶１型相比，结晶２型的ｄ＝０４９ｎｍ与ｄ＝０２８ｎｍ的反射强烈出现。

Poly( p benzamide) can be dissolved in DMSO NaH system,giving a homogenious solution of polyanion.After evaporating DMSO and using some solvents for regenerating polyanion into poly( p benzamide),regenerated films were obtained.By X ray diffraction,the dried films at room temperature are amorphous.Heat treating at 130℃ for 14h did not influence the structures of the films very much,but after heat treating at 250℃ or 300℃ for 30s,the structures of the films changed from amorphous state into modification 1 or modification 2 of crystal.Comparing with modification 1,modification 2 had reflections at d =0 49nm and d =0 28nm strongly,but the reflection corresponding to the reflection at d =0 31nm in modification 1 disappeared or could not be observed clearly.