As a special engineering material, polyimide has been widely used in aviation, aerospace, microelectronics, nano, liquid crystal, separation membrane, laser and other fields. In the 1960s, all countries included the research, development and utilization of polyimide as one of the most promising engineering plastics in the 21st century. Polyimide, because of its outstanding features in performance and synthesis, whether as a structural material or as a functional material, its huge application prospects have been fully recognized, known as the "problem solver" (problem solver), and that "there is no polyimide will not have today's microelectronics technology".
Polyimides can be divided into four categories: homophenylene PI, soluble PI, polyamide-imide (PAI) and polyetherimide (PEI).
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