Modification method of continuous PBO fiber for strengthening interface of bimaleimide resin base composite material

Abstract

The invention relates to a modification method of continuous PBO fiber for strengthening interface of thermosetting BMI resin, belonging to the technical field of advanced composite material. The method is designed for solving the technical problems of the existing fibrous reinforcement resin base composite material that the structural surface thereof is smooth, the active group is few and the cohesiveness of the resin base is weak, the technical proposal is: in a plasma treatment device, the surface of the PBO fiber is modified by adopting the low temperature plasma technology; then the PBO fiber is soaked in bimaleimide resin solution to prepare fibrous reinforcement BMI composite material presoaking material; finally the presoaking material is made into continuous fibrous reinforcement composite material by the high temperature compression molding technique. The adhesiveness of the modified fiber and the resin base is greatly improved, the interface performance is enhanced, the interlaminal shear strength of the composite material is further strengthened and the mechanical property is fine. The product of the invention can meet the increasingly demanding requirements of the modern industry on the composite material, especially the demanding dual requirements of the modern aviation industry on high temperature resistance and mechanical property of the composite material. As the BMI resin has fine electromagnetic performance, thus being capable of replacing epoxide resin as a novel electromagnetic material.

Description

technical field [0001] The invention belongs to the scientific and technical field of advanced composite materials, and in particular relates to an interface modification method for continuous PBO fiber reinforced bismaleimide resin-based composite materials. It is mainly used in aviation and aerospace fields, and is also the preferred composite material for civil high-tech industries. Background technique [0002] In recent years, composite materials have made a lot of important progress, forming an important branch, namely "Advanced Composite Materials" (ACM, Advanced Composite Materials). The main features of ACM are high strength, high modulus, high temperature resistance and low density. In addition to the characteristics of "three highs and one low", advanced resin matrix composites should also have low expansion coefficient, high dimensional stability, excellent aging resistance and fatigue resistance. Among them, thermosetting resin-based composite materials and th...

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Problems solved by technology

[0019] The present invention solves the problem that the structure surface of fiber-reinforced resin-based composite materials is smooth, there are few active groups and the adhesion of the resin matrix is ​​poor, which leads to the inability of the PBO fiber to exert its best performance, which greatly limits its application in advanced composite materials. The problem is to improve the wettability and adhesion of PBO fiber to bismaleimide resin, so as to improve the interface layer between the two-phase interface of resin and fiber and to transfer stress smoothly, greatly improving the mechanical and physical properties of composite materials , and provide a kind of interface modification method of continuous PBO fiber reinforced bismaleimide resin-based composite material, continuous PBO fiber is placed in the plasma treatment device, adopts low-temperature plasma technology to carry out surface modification to fiber, then with The bismaleimide resin solution is impregnated to prepare the fiber-reinforced BMI composite material prepreg, and finally the continuous fiber-reinforced composite material is made by high-temperature molding process; the specific steps are:

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