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基于二氧化钛的特性和4-乙烯基吡啶的功能,利用沉淀聚合法在甲醇中合成出二乙烯基苯-苯乙烯-4-乙烯基吡啶共聚物包覆的二氧化钛多核的表面光滑的球形粒子。利用DSC和TG检测了聚合效果,通过傅里叶红外光谱证实了聚合物的结构单元,利用SEM观察了复合粒子的表面,获得了具有稳定性、表面光滑的球形微粒。相应的聚合机理通过分析一系列制备核壳微球方法所得产物的SEM照片和改变一些参数所得的结果得以证实。分散的顺序和4-乙烯基吡啶的用量决定了生成复合球形微粒的机理。进而,通过溴代烷烃和在甲醇中沉淀聚合产物表面的4-乙烯基吡啶化合而成的季铵盐证实了复合微粒的电泳特性。
Based on the properties of titanium dioxide and the function of 4-vinylpyridine, spherical particles with smooth surfaces and multi-core of titanium dioxide coated with divinylbenzene-styrene-4-vinylpyridine were synthesized by precipitation polymerization in methanol. The polymerization results were measured by DSC and TG. The structural units of the polymer were confirmed by Fourier transform infrared spectroscopy. The surface of the composite particles was observed by SEM. The spherical particles with stable and smooth surface were obtained. The corresponding polymerization mechanism was confirmed by analyzing a series of SEM images of the products obtained by the method of preparing core-shell microspheres and changing some parameters. The order of dispersion and the amount of 4-vinylpyridine dictate the mechanism by which complex spherical particles are formed. Further, quaternary ammonium salts formed by the condensation of brominated alkanes with 4-vinylpyridine on the surface of the precipitated polymer product in methanol confirmed the electrophoretic properties of the composite particles.