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PI

Polyimide, abbreviated as PI, is a polymer containing acylamine group (- C-N-C-) in the main chain.

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1. PI classification

2. Common applications of PI

PI classification Polyimide (PI) is a polymer containing acyl imino groups (- C-N-C-C -) in the main chain. There are two main categories: Aliphatic (poor practicability and non commercialization) Aromatics (commercially available varieties) Aromatic polyimides can be divided into the following categories: homobenzene, monoether, diethyl anhydride, polyetherimide (PEI), polybismaleimide, norbornene diacid modified polyimide, polyamide imide (PAI).

3. PI development history

(1) Flame retardancy: PI is a self flame retardant polymer, which does not burn at high temperatures. (2) Mechanical properties (less sensitive to temperature): a、 Pure PI has low mechanical properties, especially low impact strength; b、 Fiber reinforcement will greatly improve: Impact strength: increased by more than 10 times from 27J/m to 190J/m; Tensile strength: increased by more than 20 times from 60Mpa to 1200Mpa; Bending modulus: increased from 3.8Gpa to 80 Gpa, more than 20 times;