What are the development history of polyimide?

In the past 30 years, polyimide has developed rapidly, especially in the past 10 years. From 1977 to 1979, more than 1,000 polyimide-related abstracts were published in the American Chemical Abstracts, and more than 100 polyimide documents were registered with the National Technical Service Agency of the United States.

From 1982 to 1985, 54 patents were applied for polypyromellitic imide, 30 patents were applied for polyamide imide, and 23 patents were applied for polyetherimide. This shows the development speed of polyimide polymers.