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[Chemical Knowledge]：What is PEI? Learn more about the characteristics and application areas of PEI

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PEI, also known as polyetherimide, is a high-performance engineering plastic material. It has a series of excellent physical and chemical properties, and is widely used in aerospace, automotive, electronics, machinery, medical, petrochemical and other fields. So, what material is PEI? Let's take a closer look at the characteristics and application areas of PEI.

the molecular structure and physical properties of PEI

The chemical name of PEI is polyetherimide, which is a kind of high-performance, thermoplastic polymer material. Its main characteristics are strong rigidity and high temperature resistance, as well as excellent electrical and mechanical properties. The molecular structure of

PEI is shown in the figure. It has a straight chain backbone linked by imide groups. There are two imide groups in the molecule, which is the basis for the unique chemical characteristics of PEI.

! [PEI](https://cdn.nlark.com/yuque/0/2022/png/19486117/1643458108977-0b0fd2f7-d15e-469f-88e8-443340fd40b9.png)
The physical and chemical properties of
PEI are also important elements in material applications. PEI has some excellent physical properties, such as high rigidity, high strength, high heat resistance, excellent corrosion resistance and friction resistance, while PEI also has good transparency, insulation, dimensional stability and so on.

PEI applications and process performance

PEI applications are widely divided into the following areas:

1. Aerospace: PEI is one of the most commonly used materials in the aerospace industry, its high heat resistance and high rigidity and other performance characteristics, so that PEI has a wide range of applications in the aerospace industry.

2. Electronics: PEI is widely used in the electronics industry. Its high temperature resistance and good electrical properties make it an ideal material for high-standard PCB printed boards.

3. Machinery: PEI has a wide range of applications in mechanical manufacturing, especially in the thermoplastic molding process, such as extrusion, injection molding and other processes, the excellent quality of PEI is particularly prominent.

4. Medical: PEI materials are more and more widely used in the field of medical devices, mainly because of their excellent physical and chemical properties, such as high temperature resistance, corrosion resistance and so on. The process performance of

PEI is also an important aspect of the material's application. PEI has excellent thermoplasticity and can be used in a variety of ways for turning, drilling, machining and other operations. At the same time, PEI also has good processability and high dimensional stability, and can be produced by extrusion, injection molding and other processes.

the excellent quality and application prospects of PEI

PEI as a high-performance engineering plastic material, with excellent physical and chemical properties, is widely used in aerospace, automotive, electronics, machinery, medical, petrochemical and other fields. After a series of exquisite processes, PEI materials can obtain excellent heat resistance, high strength, high stability and other performance, and become the preferred material for various engineering applications.

From the current application situation, the development prospects of PEI materials are broad, and there will be a broader development space in the future. It is foreseeable that PEI materials will have a wider range of applications and more development opportunities in aerospace, electronics, machinery, medical and other fields.

Conclusion: This paper introduces the structure, physical and chemical properties and process performance of PEI materials in detail, aiming to give readers a more comprehensive and in-depth understanding of the excellent performance and excellent quality represented by PEI. It is hoped that this paper can enlighten the readers and make them better use PEI materials in the future engineering application process.