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在锐钛型钛溶胶颗粒或粉体TiO2存在下,进行端乙烯基硅油与含氢硅油的原位硅氢加成反应,制得聚硅氧烷/TiO2复合膜,实现TiO2在立体交联膜中的分散及与聚硅氧烷基体的有效复合.通过红外分析、电镜观察、拉伸实验和紫外-可见光透过测试,对聚硅氧烷的组成和交联结构、复合膜的形态结构及其拉伸和光学性能进行表征和分析.发现原料硅油的扩链处理和SiO2的补强作用有助于提高反应的过程稳定性及复合膜的拉伸性能.亲水性的粉体TiO2在成膜过程中易发生进一步的大规模团聚,这在膜表面构筑微纳结构的同时会劣化膜材的力学、光学性能.溶胶-凝胶法自制钛溶胶颗粒表面残留有部分未脱除的有机基团,这使其具有一定的亲油性和较好的有机相容性,因而钛溶胶颗粒可在有机介质和聚硅氧烷膜中达到初级粒子形式的均匀稳定分散.上述形态结构,可使相应复合膜具有更佳的拉伸性能和紫外屏蔽/可见光透过性能,并有望在保持复合膜高耐老化性的同时具有高效的光催化性能.
In the presence of anatase titanium sol particles or powder TiO2, the in situ hydrosilylation reaction of terminal vinyl silicone oil and hydrogen silicone oil is carried out to obtain a polysiloxane / TiO2 composite membrane, so as to achieve a TiO2 cross-linked film And the composite with the polysiloxane matrix.Analysis of the composition and cross-linked structure of polysiloxane and the morphological structure of the composite membrane by infrared analysis, electron microscope observation, tensile test and UV-visible light transmission test Its tensile and optical properties were characterized and analyzed.It was found that the extension of the raw material silicone oil and the reinforcing effect of SiO2 help to improve the stability of the reaction process and the tensile properties of the composite film.The hydrophilic powder TiO2 in Further large-scale agglomeration easily occurs in the membrane process, which can degrade the mechanical and optical properties of the membrane while the micro-nano structure is formed on the membrane surface. Some unreacted organic groups remain on the surface of the sol-gel self-made titanium sol particles Group, which makes it has a certain lipophilic and better organic compatibility, and thus the titanium sol particles in the organic medium and polysiloxane film to achieve uniform and stable dispersion of primary particles in the form of the above structure, so that the corresponding Composite film with Better tensile properties and ultraviolet screening / visible light transmittance properties, and is expected to have high photocatalytic activity while maintaining a composite film having high aging resistance.