Miniemulsion polymerization of SiO2-p(methyl methacrylate) composite microsphere with waterborne polyurethane used as the surfactant
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摘要: 采用异佛尔酮二异氰酸酯(IPDI)、聚醚二元醇N210和二羟甲基丙酸(DMPA)为主要反应原料, 合成出羧酸型水性聚氨酯, 并以甲基丙烯酸羟乙酯(HEMA)对其进行C=C封端, 然后使用该水性聚氨酯作为可聚合表面活性剂, 采用双原位细乳液法, 不同引发剂体系引发聚合, 制备出SiO2-聚甲基丙烯酸甲酯复合微球。通过TEM、FTIR和TGA等测试方法对所得产物进行了表征分析。结果表明, 使用水性聚氨酯表面活性剂(PUS)所制备的SiO2-聚甲基丙烯酸甲酯复合微球形貌, 不同于传统小分子表面活性剂所制得产物的形貌, 而且引发剂类型对SiO2-聚甲基丙烯酸甲酯复合微球形貌有较大影响。Abstract: The carboxylic waterborne polyurethane was synthesized with isophorone diisocyanate(IPDI), polyether glycol(N210) and 2,2-bis(hydroxymethyl) propionic acid(DMPA) as the major materials, and terminated by C=C from β-hydroxyethyl methacrylate(HEMA). SiO2-PMMA composite microspheres were prepared with different types of initiators by double in situ miniemulsion polymerization, in which the waterborne polyurethane was used as a polymerizable surfactant. The prepared products were characterized by TEM, FTIR and TGA, respectively. The results indicate that morphologies of the SiO2-PMMA composite microsphere prepared by waterborne polyurethane surfactant(PUS) are different from those prepared by conventional micromolecule surfactants. The type of initiators affects significantly on the morphologies of the SiO2-PMMA.
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