环氧树脂用硅溶胶的制备和表征

以正硅酸乙酯(TEOS)作为溶胶-凝胶(sol-gel)过程的先驱体,在酸、碱性催化剂作用下制备环氧树脂(EP)用硅溶胶。探讨了酸、碱性条件下乙醇和水的用量对sol-gel过程的影响,并采用傅里叶红外光谱(FT-IR)、透射电镜(TEM)法对硅溶胶的结构进行了表征与分析。结果表明:在酸性(或碱性)条件下,n(乙醇)∶n(TEOS)=2∶1(或4∶1)、n(TEOS)∶n(水)=1∶2是最佳配比;酸性条件下制取的液态硅溶胶体系比较均匀,并具有线型结构;碱性条件下制取的液态硅溶胶具有体型结构,并且易团聚在一起,形成微粒聚集体。

Preparation and characterization of silicon sol-gel used for epoxy resin

A silicon sol-gel was prepared by tetraethyl orthosilicate(TEOS) as precursor of sol-gel process under acid or alkaline catalysis.The influences of ethanol or water contents were investigated on sol-gel process under acid or alkaline condition.The structure of silicon sol-gel was characterized by FT-IR and SEM methods.The results showed that the optimal materiel ratio was obtained when molar ratio of n(ethanol)∶n(TEOS) was 2∶1 under acid condition or 4∶1 under alkaline condition,and molar ratio of n(TEOS)∶n(water) was 1∶2.The liquid silicon sol-gel which was prepared under acid condition had linetype structure and more homogeneous systems,but the liquid silicon sol-gel which was prepared under alkaline condition had dimensional structure and unhomogeneous systems with particle-congeries.