Study On The Surface Modification Of Glass Fiber And The Composites Reinforced By Gradient Glass Fiber

In this article, the gradient glass fiber (MGF₁ and MGF₂) were prepared with two kinds of organic silicon compound modifying on glass fiber surface, and then the MGF₁ and MGF₂ were used to reinforce PP resin and SAN resin, the emphases in this article were put on influence of the interphase of gradient glass fiber reinforced composites by different treatment.1. With the purification of short glass fiber, Tetraethylorthosilicate (TEOS) and Polydimethylsiloxane (PDMS) were modified on the surface of glass fibers as raw material, and then MGF₁/PP composites were prepared. FESEM, FTIP, tensile strength, impact strength were used for investigating property and structure of MGF₁i and MGFi/PP composites. The FESEM photos of glass fibers showed that glass fibers were covered with the organic silicon membrane. FTIR results showed that the silicon membrane consisted of-Si-O- and -Si-R- flexible segment, and this silicon membrane changed gradually from inorganic phase to organic phase on the surface of the glass fiber. The mechanical property of MGF₁ /PP composites and the impact fracture FESEM photos showed that there were better compatibility and interfacial behavior between MGF₁ and PP matrix. Compared with glass fiber /PP composites treated by coupling agent, this graded structure improved cohesional strength, transfer efficiency of stress and energy between MGF₁ and PP matrix.2. Using glass fibers modified by TEOS and Phenyltriethoxysilane (PTES) made by ourselves, PTES-g-GGF were prepared. FESEM showed that the surface of MGF₂ was more uniform than that of MGF₁, because of the grafted of -O-Si-Ph. IR results showed there were lots of phenyl groups on the surface of MGF₂, implying the graded structure of the silicon membrane. The FESEM of impact fracture showed fibers in the MGF₂/SAN composites possessed better compatibility, interfacial behavior and dispersivity.