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全芳香的聚酰亚胺具有优良的综合性能,而其耐热性和耐热氧化性则更为突出,但是这类聚合物中的主要品种,例如由均苯四甲酸二酐与二苯醚二胺所得到的聚酰亚胺,由于没有明显的软化点而不易加工成型.为了改进聚酰亚胺的加工性能,往往在大分子主链中引入醚链.醚链的引入能够增加大分子链的柔性,改善聚合物的加工性能,同时又不致于降低聚合物的耐热性和耐热氧化性,典型的代表是由3、3′,4、4′-二苯醚四甲酸二酐及1,4-双(3′,4′-二羧基苯氧基)苯二酐分别与4,4′-二苯醚二胺所合成的可熔性聚酰亚胺.这类聚酰亚胺可以方便地模压成型,后者以邻苯二甲酸酐调节分子量后,还可以进行注射和挤塑成型.
Fully aromatic polyimides have excellent overall properties, but their heat resistance and thermal oxidation resistance are more prominent, but the main species in this class of polymers, such as pyromellitic dianhydride and diphenyl ether Diamine obtained polyimide, because there is no obvious softening point and difficult to process molding.In order to improve the processing performance of polyimide, often in the macromolecular main chain ether chain introduced.The introduction of ether chain can increase macromolecules The flexibility of the chain improves the processability of the polymer without reducing the heat resistance and thermal oxidation resistance of the polymer, typically represented by 3,3 ’, 4,4’-diphenyl ether tetracarboxylic dianhydride And 1,4-bis (3 ’, 4’-dicarboxyphenoxy) phthalic anhydride and 4,4’-diphenyl ether diamine synthesis of fusible polyimide. Such polyimide Amines can be easily molded, the latter with phthalic anhydride to adjust the molecular weight, but also for injection and extrusion molding.