研究了甲基三乙氧基硅烷的预聚体(PMTES)对含有聚乙二醇(PEG)的SiO2悬胶体的稳定性以及所得膜层的结构、形貌和稳定性的影响.结果表明:PMTES的掺杂仅仅改变了SiO2悬胶体的粘度而对其稳定性影响较小,掺杂改性溶胶在室温条件下的存放期超过2个月;当烘烤温度超过200℃时,掺杂剂PMTES的结构开始发生明显变化,改性膜层在150℃烘烤0.5 h后其稳定性大幅度提高,室温下至少可以存放5个月而保持透过率不变;掺杂对膜层的形貌影响甚微,改性膜层结构致密、表面均匀,具有更强的环境适应性.
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