Polyimide: Preparation, Characteristics, Properties, Processing, and Applications

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Processing and Engineering".

Deadline for manuscript submissions: closed (15 November 2023) | Viewed by 3249

Special Issue Editor


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Guest Editor
College of Material Science and Engineering, Harbin University of Science and Technology, Harbin 150080, China
Interests: new insulating material; electronic materials; dielectric materials; thermosetting polymers for adhesives

Special Issue Information

Dear Colleagues,

Polyimide is widely used in motor and electric appliances, electronic devices, aerospace, new energy, and other fields due to its superior all-around performance, which includes high temperature resistance, high strength, high modulus, electrical insulation, radiation resistance, corrosion resistance, and resistance to heat and humidity. As a result of improvements in modern technology and industry, as well as the expanding application area of polyimide films, there has been an ever-increasing need for polyimide films. Currently, the use of polyimide films in electrical insulation, electronic devices, flexible displays, and 5G communication is growing toward greater differentiation, variety, and customization. It is vital to create polyimide films that are highly insulating, have a low expansion coefficient, are transparent, have a low/high dielectric constant, and exhibit high thermal conductivity. Over the last several decades, the world has made significant advances in polyimide research, but its technical capability remains relatively sluggish, and there is still a long way to go in high-tech areas such as high-speed variable frequency motors, flexible copper clad laminate, and new displays. Special emphasis will be placed on but not limited to the following: 

  • PI membranes low contractility;
  • PI membranes with low dielectricity;
  • Transparent PI membranes;
  • BMI adhesive and composite materials;
  • TPI engineering plastics;
  • Polyimide enameled wire paint.

Dr. Xiaorui Zhang
Guest Editor

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Published Papers (1 paper)

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Research

11 pages, 3624 KiB  
Article
Characterization of Mechanical, Electrical and Thermal Properties of Bismaleimide Resins Based on Different Branched Structures
by Haihui Cai, Jiahao Shi, Xiaorui Zhang, Zhou Yang, Ling Weng, Qingye Wang, Shaohui Yan, Lida Yu and Junlong Yang
Polymers 2023, 15(3), 592; https://doi.org/10.3390/polym15030592 - 24 Jan 2023
Cited by 2 | Viewed by 2513
Abstract
Bismaleimide (BMI) resin is an excellent performance resin, mainly due to its resistance to the effect of heat and its insulating properties. However, its lack of toughness as a cured product hampers its application in printed circuit boards (PCBs). Herein, a branched structure [...] Read more.
Bismaleimide (BMI) resin is an excellent performance resin, mainly due to its resistance to the effect of heat and its insulating properties. However, its lack of toughness as a cured product hampers its application in printed circuit boards (PCBs). Herein, a branched structure via Michael addition was introduced to a BMI system to reinforce its toughness. Compared with a pure BMI sample, the flexural strength of the modified BMI was enhanced, and its maximum value of 189 MPa increased by 216%. The flexural modulus of the cured sample reached 5.2 GPa. Using a scanning electron microscope, the fracture surfaces of BMI samples and a transition from brittle fracture to ductile fracture were observed. Furthermore, both the dielectric constant and the dielectric loss of the cured resin decreased. The breakdown field strength was raised to 37.8 kV/mm and the volume resistivity was improved to varying degrees. Consequently, the resulting modified BMI resin has the potential for wide application in high-frequency and low-dielectric resin substrates, and the modified BMI resin with a structure including three different diamines can meet the needs of various applications. Full article
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