Preparation method of PBO fiber composite material with high-temperature dielectric property

Abstract

The invention discloses a preparation method of a PBO fiber composite material with a high-temperature dielectric property, aims at improving the interfacial force of the composite material on the basis of guaranteeing excellent dielectric property of the PBO fiber cyanate ester composite material, and solves the problems that PBO fiber is smooth in surface and the bonding strength between the surface of the PBO fiber and a resin interface is low. The preparation method comprises the following steps: firstly, preparing a hyperbranched PBO polymer grafting solution; secondly, performing infiltration treatment on a PBO fiber bundle; thirdly, performing deacidification treatment on the PBO fiber bundle; fourthly, performing irradiation grafting treatment on the PBO fiber bundle; fifthly, preparing the PBO fiber cyanate ester composite material. The method has the advantages that the surface of the PBO fiber is grafted with hyperbranched PBO polymer through a Co60 gamma ray irradiation method, the interface bonding strength of the PBO fiber cyanate ester composite material is enhanced, the increased range of the interface strength is 32 to 45.65 percent, the formed PBO fiber cyanate ester composite material has excellent dielectric property, and the method is beneficial to the preparation of structure and function integrated wave-transmitting composite materials.

Description

technical field [0001] The invention belongs to the technical field of PBO fiber composite material preparation, and in particular relates to a preparation method of a PBO fiber composite material with high-temperature dielectric properties. Background technique [0002] Aerospace vehicles need to fly in a high-temperature environment above 300 °C, which puts forward higher requirements on the high-temperature performance of aircraft radome materials. It is particularly important to prepare structural-functional composite materials in the field of antenna systems. However, good high-temperature dielectric properties are based on stable and strong structural properties. Although PBO fiber has excellent high temperature resistance and dielectric properties, the lack of active groups and roughness on the surface leads to weak interfacial bonding performance, and its composite material performance, especially high temperature performance, is not ideal, which limits the use of P...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of preparation method of PBO fiber composite material with high temperature dielectric property in order to solve the problem of existing PBO fiber interface performance and high temperature resistance poor, this method is to carry out surface activation and roughening treatment to PBO fiber, Then, the hyperbranched polybenzoxazole grafted PBO fiber with excellent dielectric properties and heat resistance and cyanate ester are made into high-temperature dielectric composite materials, which can improve the interface properties and high-temperature dielectric properties of PBO composite materials at the same time. The material has excellent dielectric properties, interface properties and heat resistance

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