SYNTHESIS AND THERMAL PROPERTIES OF POLYBENZOXAZOLE FROM SOLUBLE PRECURSOR WITH HYDROXY-SUBSTITUTED POLYENAMINONITRILE  

作　　者：范星河 周其凤 

机构地区：[1]Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

出　　处：《Chinese Journal of Polymer Science》2004年第4期349-353,共5页高分子科学（英文版）

基　　金：This work is supported by the 863 Program (No. 2001AA335050) and the 973 Program (No. 2003CB615600) of MOST ofthe People's Republic of China.

摘　　要：Aromatic polybenzoxazole (PBO) precursor, hydroxy-substituted polyenaminonitrile, was prepared by direct polycondensation of 1,4-bis(1-chloro-2,2-dicyanovinyl)benzene (CCB) and 4,6-diaminoresorcinol dihydrochloride (DAR) using pyridine and N,N-dimethylacetamide as condensing agent and solvent. The precursor has good solubility in polar aprotic solvent which is due to the strong dipolar nature of the main chain. The soluble precursor was subjected to thermal cyclization in an inert atmosphere to convert it into the corresponding PBO, which has its 5% weight loss temperature at The fully cyclized PBO were characterized by FT-IR and TGA. The introduction of 10% mol 1,3,5- benzenetricarboxylic chloride (BTC) into the main chain not only has little effect on the solubility of PBO precursor but also raises its 5% weight loss temperature to 552°C and char yield at 700°C for the cyclized PBO with BTC.Aromatic polybenzoxazole (PBO) precursor, hydroxy-substituted polyenaminonitrile, was prepared by direct polycondensation of 1,4-bis(1-chloro-2,2-dicyanovinyl)benzene (CCB) and 4,6-diaminoresorcinol dihydrochloride (DAR) using pyridine and N,N-dimethylacetamide as condensing agent and solvent. The precursor has good solubility in polar aprotic solvent which is due to the strong dipolar nature of the main chain. The soluble precursor was subjected to thermal cyclization in an inert atmosphere to convert it into the corresponding PBO, which has its 5% weight loss temperature at The fully cyclized PBO were characterized by FT-IR and TGA. The introduction of 10% mol 1,3,5- benzenetricarboxylic chloride (BTC) into the main chain not only has little effect on the solubility of PBO precursor but also raises its 5% weight loss temperature to 552°C and char yield at 700°C for the cyclized PBO with BTC.

关 键 词：POLYBENZOXAZOLE PRECURSOR Hydroxy-substituted Polyenaminonitrile CYCLIZATION 

分 类 号：O631[理学—高分子化学]