Hyperbranched polymer and method for improving bonding performance of fiber and epoxy resin

Abstract

The invention discloses a hyperbranched polymer and a method for improving bonding performance of fiber and epoxy resin, and belongs to the technical field of fiber surface treatment. By using diethylenetriamine and methyl acrylate as raw materials and under N2 protection, viscous light yellow amino-terminated hyperbranched polymer HBP-NH2 is synthesized and used as a coupling agent for surface treatment of PBO fiber. By using the amino-terminated hyperbranched polymer for treatment of PBO fiber, the PBO fiber treated with HBP-NH2 has stable morphology and is rich in N-H bonds on the surface,and the interface bonding performance between the PBO fiber and resin is improved. Test data shows that the interfacial shear force is increased by 0.99 Mpa.

Description

technical field [0001] The invention relates to the technical field of fiber surface treatment, in particular to a hyperbranched polymer and a method for improving the bonding performance of fiber and epoxy resin. Background technique [0002] Treating fibers with polymers containing functional groups, introducing functional groups on the fiber surface or activating the fiber surface, so as to improve the interfacial properties between the fiber and the resin matrix has always been the focus of research in the field of composite materials. [0003] PBO fiber is the abbreviation of Poly-p-phenylenebenzobisthiazole fiber (Poly-p-phenylenebenzobisthiazole), which is a reinforcing material for composite materials developed by the United States in the 1980s for the development of aerospace industry. One of the most promising members of the polyamide family is known as the superfiber of the 21st century. It has very excellent physical and mechanical properties and chemical proper...

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Problems solved by technology

[0004] When studying PBO fibers, the applicant found that the regular and orderly orientation structure of the molecules makes the surface of PBO fibers smooth, while there is a lack of transverse connections between molecular chains, most of the polar heteroatoms on the molecular chains are wrapped inside the fibers, and the surface of the fibers is extremely The resistance is very small, resulting in smooth surface of PBO fiber, low activity, not easy to infiltrate with resin, resulting in poor interfacial bonding force and low interfacial shear strength between fiber and resin

At the same time, using silane coupling agent to treat the surface of PBO fiber, most of the coupling agent can not significantly improve the interfacial bonding performance between PBO fiber and resin matrix, thus affecting the application of PBO fiber in some fields

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