聚己内酯/ 环氧树脂/ SiO2杂化材料的制备及性能

采用端硅氧烷基聚己内酯( PCL-TESi) 作为无机前躯物, 通过环氧树脂/ KB-2 的固化反应和PCL-TESi的溶胶2凝胶过程, 制备了聚己内酯/ 环氧树脂/ SiO₂ ( PCL/ EP/ SiO₂ ) 有机-无机杂化材料。利用红外光谱、透射电镜( TEM) 、热失重分析( TGA) 及在甲苯溶液中的溶胀试验对不同SiO₂ 含量的杂化材料进行分析。研究发现, 随着PCL-TESi 含量增大杂化体系交联密度降低; 此杂化体系中存在环氧和Si —O —Si 两种交联网络, 微观上形成纳米两相结构; Si —O —Si 交联网络的形成显著提高了材料的耐热性能, 使失重5 %时的热分解温度从120.5 ℃(纯环氧树脂/ KB-2 体系) 提高到277.6 ℃(SiO₂质量分数为3. 84 %的杂化体系) 。 

Preparation and properties of polycaprolactone/ epoxy/ sil ica dioxide hybrids

A series of organic/ inorganic hybrids involving epoxy resin and t riethoxysilane-terminated polycaprolactone elastomer ( PCL-TESi) were prepared via polymerization of diglycidyl ether of bisphenol A (DGEBA) withamine curing agent KB-2 and sol-gel process of PCL-TESi. The organic/ inorganic hybrids were characterized byFT-IR , transmission elect ron microscopy ( TEM) , thermogravimetry analysis ( TGA) and swelling in toluene. Theresult s show that the swelling property in toluene , morphologies and thermal degradation of the hybrids are quitedependent on the content of PCL-TESi. The crosslink network density decreases with increasing of the PCL-TESi.And in TEM , the phase separation morphology of these hybrids is found , which resulted f rom the coagulation ofSi —O —Si networks and the curing reaction of the epoxy resin system. Meanwhile , the size of each phase is in nanoscale. And in TG analysis , the characteristic decomposition temperature at 5 % weight loss is evidently increasedf rom 120. 5 ℃of pure cured epoxy to 277. 6 ℃of 3. 84 % SiO2 modified epoxy ; this is due to the existence of Si —O —Si when PCL2TESi is added in the hybrid.