甲基苯基二甲氧基硅烷含量对光固化有机硅/SiO_2杂化涂层性能的影响

Influence of Dimethoxymethylphenylsilane Content on the Properties of UV Curable Organosilicon /SiO_2 Hybrid Coatings

目的获得耐热性和耐蚀性好,且可紫外光固化的有机硅/SiO2杂化涂层,研究甲基苯基二甲氧基硅烷(PDMS)含量对涂层性能的影响。方法以正硅酸乙酯(TEOS)为SiO2前驱物,PDMS与γ-(甲基丙烯酰氧)丙基三甲氧基硅烷(KH-570)为有机硅前驱物,采用溶胶-凝胶法制备PDMS含量不同的有机硅/SiO2杂化溶胶,经光固化后,得到有机硅/SiO2杂化涂层。对涂层进行机械性能测试,以及红外光谱分析、热重分析和电化学阻抗谱分析。结果前驱物均水解完毕并发生缩合反应,从而得到了有机硅/SiO2杂化涂层;随着PDMS含量的增加,杂化涂层的硬度降低,耐冲击性、柔韧性和附着力良好且变化不大。结论 PDMS的加入有利于提高涂层的综合性能,当n(TEOS)∶n(PDMS)∶n(KH-570)=15∶16∶7时,有机硅/SiO2杂化涂层的耐热和耐蚀性能达到最佳。

Objective UV curable organosilicon/SiO2 hybrid coatings were prepared. Influence of Dimethoxymethylphenylsilane （PDMS） content on the properties of the coatings was discussed. Methods UV curable organosilicon/SiO2 hybrid sol with different PDMS contents was synthesized by the method of sol-gel in which tetraethyl orthosilieate （TEOS） was used as the precursor of inor- ganic component, while Dimethoxymethylphenylsilane （PDMS） and ~,-methacryloxypropyltrimethoxysilane （KH-570） were used as the precursors of organsilicone. Then the organosilieone/SiO2 hybrid coatings were obtained by UV curing. The performance of coatings were characterized by methods of mechanical tests, thermo gravimetrie analysis, heat resistance tests and electrochemical impedance spectroscopy tests. Results Hydrolysis-condensation reaction occurred to all precursors, resulting in UV curable organo- silicon/SiO2 hybrid coatings. The hardness of the hybrid coatings decreased with the increasing PDMS contents, however, the coat- ing exhibited good impact strength, flexibility and adhesion. Conclusion PDMS addition can improve the properties of coatings. The hybrid coatings had the optimal heat resistance and corrosion-resistance performances with the molar ratio of TEOS ： PDMS ： KH-570 set at 15 ： 16 ： 7.