Thermal conductivity and dielectric properties of bismaleimide/cyanate ester copolymer

Abstract

The blend was synthesised with bismaleimide (BMI) resin and bisphenol A-based cyanate ester (BADCy) resin. The BMI/BADCy copolymer showed excellent dielectric and thermal conductivity properties. The volume resistivity of the copolymer was a little lower than BADCy system. The volume resistivity of blend was 7.8 × 10^15 Ω·cm when the BMI content was 20 wt%, which still showed good insulation performance. The dielectric property of modified BADCy copolymer remained the good stability from 0.1 Hz to 1 MHz. Compared to pure BADCy system, the breakdown property of BMI/BADCy blend reached the maximum value of 77.9 kV/mm when the content of BMI was 20 wt%, which was still about 1.22 times. The thermal property and thermal conductivity property of the copolymer were higher than BADCy system.

Keywords

• thermal conductivity
• polymer blends
• resins
• materials preparation
• electric breakdown
• permittivity
• dielectric losses
• frequency 0.1 Hz to 1 MHz
• dielectric properties
• bismaleimide-cyanate ester copolymer
• bismaleimide resin
• bisphenol A-based cyanate ester resin
• thermal conductivity
• volume resistivity
• insulation performance
• breakdown property