水性聚氨酯为表面活性剂的SiO_2-聚甲基丙烯酸甲酯复合微球的细乳液法制备

Miniemulsion polymerization of SiO_2-p(methyl methacrylate) composite microsphere with waterborne polyurethane used as the surfactant

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。

The carhoxylic waterborne polyurethane was synthesized with isophorone diisocyanate（IPDI）, polyether glycol（N210） and 2,2-bis（hydroxymethyl） propionie aeid（DMPA） as the major materials, and terminated by C--C from β-hydroxyethyl methacrylate（HEMA）. Si（）2-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 surfaetant（PUS） are different from those prepared by conventional micromolecule surfactants. The type of initiators affects significantly on the morphologies of the SiO2- PMMA.