STUDY ON HYDROLYSIS OF POLYIMIDE AND POLYPHENYLQUINOXALINE

Although polyimide (PI) and polyphenylquinoxaline (PPQ) are both heat resistant polymers, their hydrolytic stabilities are quite different. In this paper, the electron densities of two model compounds——N-phenylphthalimide and 2,3-diphenylquinoxaline are calculated by moans of CNDO/2 method. On the other hand, hydrolysis of model compounds and polymers is carried out. The theoretical calculation and experiments both prove that PPQ has excellent hydrolytic stability while PI is completely hydrolyzed under the same experimental condition. The mechanism of hydrolysis is also predicted.     

含苯并呋喃环的聚苯基单醚喹噁啉

由含苯并呋喃环的芳族四酮与芳族四胺进行溶液缩聚反应，合成了两种新的含苯并呋喃环的聚苯基单醚喹啉，用红外光谱、元素分析、差热及热重分析对聚合物进行了表征，测试了力学性能，并对其在较低温度下形成的多孔薄膜进行了分离、透过性能的研究，实验结果表明，聚合物不仅具有优良的耐热性与力学性能，也具有良好的纯水透过率和截留性能．     

几种芳杂环高分子膜对气体分离性能的研究

聚苯基-1,2,4-三嗪(PPT)、聚苯基单醚喹嗯啉(PPQ(E))、聚苯基喹哑心啉(PPQ(B))、聚酰亚胺(PI)和聚苯并咪唑吡咯酮(PY)均是耐高温高分子。本文制备了这些高聚物的均质膜(除PI外),研完了它们对O_2、N_2和H_2、N_2、CO、CH_4的分离性。     

SYNTHESIS AND PROPERTIES OF POLYPHENYLQUINOXALINES CONTAINING CHLORO-ATOM

Several polyphenylquinoxalines (PPQ's) containing chloro-atom in the side chain have been syn-thesized and characterized by IR, TGA, ITGA and DTA. High quality, flekible, glass-cast films andvarnished wires have been obtained. The T_g's values and thermal stabilities of these polymers wereguater than those without any chloro-atom substitutent.     

新型超滤膜的研制

超滤膜是一种具有不对称微孔结构的半透膜,在压力的驱动下,借助于膜的选择透过性能,可将溶液中的组份进行分离、提纯、浓缩与富集。近年来,国内外学者陆续将多种合成