溶胶-凝胶法制备环氧/SiO2纳米杂化材料及其性能研究

摘要

以异氰酸丙基三乙氧基硅烷（IPTS）接枝环氧树脂（EP）合成出了一种新型的环氧预聚物（IEP）,由IEP通过溶胶-凝胶法制备出了EP/SiO2杂化材料。通过FT-IR、AFM、TG、DMA表征和分析了杂化材料的化学结构、SiO2纳米粒子在EP基体中的分散性和无机纳米粒子的引入对EP树脂热性能和力学性能的影响。结果表明,原位生成的纳米SiO2粒子在EP基体中的分散性良好,其平均尺度约为50nm;杂化材料的热性能和力学性能相比于纯EP有了很大程度的提高。%Epoxy/SiO2 hybrid materials was prepared by the sol-gel process using a novel epoxy prepolymer (IEP) prepared by 3 isocyanatopropyltriethoxysilane grafted epoxy as inorganic precursor. The structures of epoxy/Si()2 hybrid materials and the dispersion of nano SiO2 in the EP matrix were characterized by FT-IR, AFM. The relationship between hybrid materials' thermal and mechanical properties and nano SiO2 introduced were studied by TG, DMA and tensile shear strength test. The results showed that in situ generated nano SiO2 dispersed uniformly in the EP matrix and its average diameter is around 50nm and the hybrid materials' thermal and mechanical properties improved a lot compared with pure EP.