Polyimide is the molecular structure contains an aromatic heterocyclic polymer compounds of polyimide-based chain links, the English name Polyimide (PI for short), can be divided into benzene-type PI, soluble PI, polyamide-imide (PAI) and polyetherimide (PEI) four categories. PI is currently one of the best varieties of engineering plastics heat resistance, some varieties can withstand long-term...