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介绍了近年来聚酰亚胺（PI）的发展状况，总结了它们的结构特点、性能改进和在各领域的应用．为高性能的工程塑料的研究提供了基本资料。
The development of polyimide (PI) in recent years is introduced, and their structural characteristics, performance improvement and application in various fields are summarized. For high-performance engineering plastics research provides the basic information.