Abstract:

A multifunctional integrated structural composite material with heat insulation, erosion resistance, electromagnetic shielding, etc., is prepared to meet the urgent demand for multifunctional composite materials in weapons and equipment. In this paper, the carbon nanotubes are dispersed in the resin matrix by ultrasonic dispersion process, and the domestic carbon cloth/phenolic composites modified by carbon nanotubes are prepared. The interlaminar shear strength of domestic carbon cloth/phenolic composites modified by carbon nanotubes is increased by 57.4% when the content of carbon nanotubes reaches 1.5%. The bending properties, interlaminar properties and impact resistance of the oriented domestic carbon fiber/phenolic resin composites modified by carbon nanotubes were tested. The test results show that the mechanical properties and modulus of the oriented domestic carbon fiber/phenolic resin composites are significantly improved after the modification of carbon nanotubes. The electrical conductivity and thermal conductivity of carbon nanotube-modified chopped high-strength glass fiber/phenolic resin matrix composites are also studied. The results show that the resistivity of chopped high-strength glass fiber/phenolic resin matrix composites is decreaseed by an order of magnitude with the increase of carbon nanotube content. When the content of carbon nanotubes reaches 14%, the resistivity of the composites decreases from 10¹⁰Ω·m to 10^-2Ω·m, and The composites change from insulator to conductor. When the content of carbon nanotubes is less than 6%, the thermal conductivity of the composites is improved, but it is improved modestly compared with the electrical properties of the composites.

Key words: carbon nanotubes, carbon cloth/phenolic composite, carbon fiber/phenolic composite, electric conduction, heat insulation