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What is a PI?

2024-10-18 09:43:54

Polyimide (PI) is a polymer containing an imide ring (-CO-NR-CO-) in the main chain. It is one of the organic polymer materials with the best comprehensive properties. Its high temperature resistance can reach more than 400°C, and its long-term use temperature range is -200 to 300°C. Some parts have no obvious melting point and have high insulation properties. They belong to F to H class insulation materials.

Based on the chemical structure of the repeating units, polyimides can be divided into three types: aliphatic, semi-aromatic and aromatic polyimides. According to the inter-chain interaction force, it can be divided into cross-linked type and non-cross-linked type.

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As a special engineering material, polyimide has been widely used in aviation, aerospace, microelectronics, nanotechnology, liquid crystal, separation membranes and lasers. In the 1960s, various countries listed the research, development and utilization of polyimide as one of the most promising engineering plastics in the 21st century. Due to its outstanding characteristics in performance and synthesis, polyimide has been fully recognized for its huge application prospects, whether as a structural material or a functional material. It is known as a "problem-solving expert" and is considered "if not Without polyimide there would be no microelectronics today."