以正硅酸乙酯(TEOS)和甲基三甲氧基硅烷(MTMS)为水解前驱体,y-缩水甘油醚基丙基三甲氧基硅烷(GPTMS)为偶联剂.采用溶胶-凝胶法合成了有机-无机杂化环氧树脂.研究了水解单体和用水量对涂层性能的影响.结果表明:当水与水解单体物质的量比为4∶1时,杂化涂层附着力为1级,硬度为4H,耐盐雾时间达到360 h.电化学测试表明,在低频区杂化涂层阻抗值可达105 Ω·cm2,比铝合金裸板阻抗值高出2个数量级.表现出良好的防腐蚀性.热重分析显示,杂化树脂具有优异的热稳定性能.利用红外光谱与核磁共振分析了杂化涂层的组成和结构;同时,探讨了溶胶-凝胶杂化涂层的反应机理.
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