Polyimide is a kind of high-performance material. It can resist high temperatures, and it’s a kind of insulator in the semiconductor industry. Since it has various applications and can solve many problems, so the polyimide cost is very high. In this post, we will share with you the synthesis mechanism and applications.

Polyimide synthesis mechanism
First, we should know the polyimide structure; you can find it below the image.


There are two categories of polyimide synthesis. The first category is the formation of imide rings during polymerization or macromolecular reactions. And the second category is the synthesis of polyamides with monomers containing imide rings.

The first type of synthesis method mainly includes: Polyimide is formed by the reaction of dianhydride and diamine; Polyimide is formed by the reaction of tetrabasic acid and diamine; obtained by the response of the dibasic ester of tetrabasic acid and diphotoamine Polyimide, etc. are obtained by reacting dianhydride and diisocyanate.

Polyimide synthesis procedure

The common way is the reaction of dianhydride and diamine, and there are three methods as below: One-step method, two-step method, three-step method, and vapor deposition method.

The one-step method is to directly polymerize dianhydride and diamine in a high-boiling solvent to form polyimide, and the monomers now synthesize polyimide without passing through polyamic acid. To increase the molecular weight of the polymer, the water should be completely removed as much as possible.

Usually, a water-carrying agent is used for azeotropic boiling to remove the generated water; or isocyanate replaces the diamine, and the generated polyamic acid salt is polymerized under high temperature and high pressure.

The two-step method is the simplest and most commonly used method for the synthesis of  Polyimide. The way first consists of dibasic acid anhydride and diamine monomer in an aprotic polar solvent.

And the three-step synthesis method refers to a process of obtaining  Polyimide through polyimide. It refers to the reaction of dianhydride and diamine to get polyamic acid. Then, under a dehydrating agent’s action, the polyamic acid is dehydrated and cyclized to polyimide, and finally, under the activity of acid or alkali catalyst or heat treatment conditions (100-250°C), Isomerized into Polyimide.

Polyimide synthesis procedure

Polyimide synthesis application

The main applications of the It is one of the earliest products of polyimide, used for slot insulation of motors and cable wrapping materials.
The second application is paint: Used as insulating paint for magnet wire or high-temperature resistant paint.
And the third application is advanced composite materials: used in aerospace, aircraft, and rocket components.

polyimide synthesis application

About Daken Chem:

Daken Chem is a professional polyimide chemicals supplier; we supply the chemicals materials. Below are the chemicals we have for the polyimide.
TFMB CAS NO. 341-58-2
6FDA  CAS NO. 1107-00-2
AB-TFMB CAS NO. 1449757-11-2

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