三种方法制备乙烯基功能化二氧化硅微球的对比

Comparative study on vinyl-functionalized silica microspheres prepared by three methods

以正硅酸乙酯(TEOS)和乙烯基三乙氧基硅烷(VTES)为硅源,分别采用后嫁接法、双硅源共缩聚法和单硅源一步法制备了微米-亚微米级功能性二氧化硅微球,记为V-SiO2(T-V)、V-SiO2(T/V)和V-SiO2(V)。通过扫描电镜、比表面测试、红外光谱分析、热重分析和接触角测量对微球进行了表征。结果表明,在硅源总量相同的条件下,制得的V-SiO2(T-V)微球表面粗糙,粒径约为1μm,水接触角为139.6°;V-SiO2(T/V)微球粘连较严重,可辨粒子直径约为1μm,水接触角为144.0°;V-SiO2(V)微球球形度好、粒径分布为3~8μm,水接触角达到153.7°。3种V-SiO2微球表面均为疏水性,其中V-SiO2(V)微球表面达到超疏水级别,可用于超疏水等特殊领域。

Three kinds of vinyl-functionalized submicron SiO2 microspheres coded as V-SiO2(T-V),V-SiO2(T/V),and V-SiO2(V)were prepared from tetraethyl orthosilicate(TEOS)and vinyltriethoxysilane(VTES)respectively by post-grafting synthesis,co-condensation,and one-step process,and then characterized by scanning electron microscopy,specific surface area measurement,infrared spectrometry,thermogravimetry,and contact angle measurement.The results showed that the V-SiO2(T-V)microspheres were 1μm in diameter and had a rough surface with a contact angle of 139.6°.The V-SiO2(T/V)microspheres were adhered together,and had an identifiable size of ca.1μm for single particle and a contact angle of 144°.The V-SiO2(V)microspheres were mostly regular sphere in shape with a diameter of 3-8μm,smooth surface,and a contact angle of 153.7°.All the V-Si O2 microspheres are hydrophobic,especially the V-SiO2(V)microspheres,which have superhydrophobicity and can be used as a superhydrophobic material.