甲醛改性松香环氧树脂/纳米SiO_2复合材料的制备与表征

Preparation and Characterization of Formaldehyde Modifi ed Rosin Epoxy Resin (FMRE)/SiO_2 Nanocomposites

用硅烷偶联剂将SiO2表面处理后再与甲醛改性松香环氧树脂混合，将不同含量的SiO2均匀地分散到环氧树脂固化体系中，然后用HHPA固化可制备出纳米复合材料。初步研究了无机纳米粒子SiO2对FMRE复合材料热性能和力学性能的影响。适量的SiO2对FMRE／HHPA固化物有明显的增韧增强作用，拉伸强度和断裂伸长率均有不同程度的提高；纳米复合材料的玻璃化转变温度可在小范围内提高，不同的添加量可提高玻璃化转变温度2-8℃。在相同的时间内，FMRE／HHPA／SiO2纳米复合材料的疏水性大于FMRE/HHPA固化物的疏水性。

SiO2 was treated on surface by silane coupling agent and mixed with FMRE then Nanocomposites could be prepared with SiO2 of different contents evenly distributed to epoxy resins system cured with HHPA. Effects of inorganic nanoparticles SiO2 on thermal performance and mechanical property of FMRE composites were preliminarily studied. SiO2. of proper content exerted obvious toughening and enhancing effects on FMRE/HHPA cured products. With 1.5 wt% SiOz content in the composite, its tensile strength and fracture elongation were improved to varying extents, but thermal properties were hardly affected. Vitrification transition temperature of nanocomposites could increase by 2-8℃ with different addition of SiO2. At the same time, hydrophobicity of FMRE/HHPA/SiO2 nanocomposites was better than that of FMRE/HHPA cured product.