聚己内酯/环氧树脂/SiO_2杂化材料的制备及性能  

Preparation and properties of polycaprolactone/epoxy/silica dioxide hybrids

作　　者：赫丽华[1] 刘平桂[1] 丁鹤雁[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《复合材料学报》2006年第3期71-76,共6页Acta Materiae Compositae Sinica

基　　金：航空基础科学基金资助项目(04H21009)

摘　　要：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-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)。A series of organic/inorganic hybrids involving epoxy resin and triethoxysilane-terminated polycaprolactone elastomer （PCL-TESi） were prepared via polymerization of diglycidyl ether of bisphenol A （DGEBA） with amine curing agent KB-2 and sol-gel process of PCL-TESi. The organic/inorganic hybrids were characterized by FT-IR, transmission electron microscopy （TEM）, thermogravimetry analysis （TGA） and swelling in toluene. The results show that the swelling property in toluene, morphologies and thermal degradation of the hybrids are quite dependent 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 from the coagulation of Si--O--Si networks and the curing reaction of the epoxy resin system. Meanwhile, the size of each phase is in nano scale. And in TG analysis, the characteristic decomposition temperature at 5% weight loss is evidently increased from 120.5℃ of pure cured epoxy to 277.60C of 3.84% SiO2 modified epoxy; this is due to the existence of Si-O- Si when PCL-TESi is added in the hybrid.

关 键 词：端硅氧烷基聚己内酯 环氧树脂 有机-无机杂化 微观结构 耐热性 

分 类 号：TB332[一般工业技术—材料科学与工程]