The effects of reaction conditions on the synthesis and properties of polypyromellitimide

被引：0
|
作者：
Nien, KE
Yang, MH
Chu, TJ
机构：
[1] KAO YUAN JR COLL TECHNOL & COMMERCE,DEPT CHEM ENGN,KAOHSIUNG 82101,TAIWAN
[2] NAN YA PLAST CORP,R&D CTR,TAIPEI 243,TAIWAN
[3] NATL CHENG KUNG UNIV,DEPT CHEM ENGN,TAINAN 70101,TAIWAN
来源：
JOURNAL OF POLYMER ENGINEERING | 1997年 / 17卷 / 01期
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D O I：
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中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Polypyromellitimide polymers have been prepared in a two-step process by polymerizing pyromellitic dianhydride with different molar ratios of diisocyanates, toluene 2,4-diisocyanate (TDI) and methylenediphenylene 4,4'-diisocyanate (MDI), in dimethylformamide. Intentionally adding water to the reaction medium to study the effect of adventitious water on the formation of polymer, it was found that the presence of water has an important influence upon the molecular weight of the polymer formed. Moreover, thermal cyclodehydration of polyamic acids results in the corresponding polypyromellitimides. The polymers are characterized by mechanical strength and thermal stability.
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页码：23 / 37
页数：15
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