![]() ![]() Semi-aromatic (also referred to as alipharomatic),.Classification Īccording to the composition of their main chain, polyimides can be: The field of polyimides is covered by various extensive books and review articles. Polyimides have been in mass production since 1955. Up to today this route continues being the primary route for the production of most polyimides. However, the first polyimide of significant commercial importance - Kapton - was pioneered in the 1950s by workers at Dupont who developed a successful route for synthesis of high molecular weight polyimide involving a soluble polymer precursor. The first semialiphatic polyimide was prepared by Edward and Robinson by melt fusion of diamines and tetra acids or diamines and diacids/diester. They found that 4-amino phthalic anhydride does not melt when heated but does release water upon the formation of a high molecular weight polyimide. The first polyimide was discovered in 1908 by Bogart and Renshaw. A classic polyimide is Kapton, which is produced by condensation of pyromellitic dianhydride and 4,4'-oxydianiline. With their high heat-resistance, polyimides enjoy diverse applications in roles demanding rugged organic materials, such as high temperature fuel cells, displays, and various military roles. Polyimide (sometimes abbreviated PI) is a polymer containing imide groups belonging to the class of high-performance plastics. Class of polymers General chemical structure of a polyimide ![]()
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