摘要： 将水性聚氨酯（WPU）作为大分子乳化剂并以易水解缩合的 3-甲基丙烯酰氧丙基三甲氧基硅烷（MPS）为单体，通过乳液聚合成功合成出以聚氨酯为壳、聚硅氧烷（PMPS）为核的一系列不同PMPS（由 MPS 单体聚合而成）含量的稳定的 WPU/PMPS 复合乳液，且 PMPS 的最高含量能达到 50%（基于乳液中不挥发组分的质量分数）时，复合乳液也很稳定。 通过透射电镜（TEM）发现复合乳液粒子的核壳结构很明显，动态光散射（DLS）测定了乳液的粒径分布，Zeta 电位测试表明了乳液稳定性与MPS 加入量有关，固体29Si核磁谱图证实了 WPU/PMPS 复合乳液在室温下成膜时，PMPS 会发生水解缩合反应，并在 WPU 涂膜中生成Si-O-Si交联型的无机结构。

关键词: 溶胶－凝胶, 乳液聚合, 大分子乳化剂, 核壳结构, 位阻保护, 甲基丙烯酰氧基丙基三甲氧基硅烷

Abstract: A series of stable latex of core-shell particles comprising PMPS poly(3-as cores and waterbome polyurethane (WPU)as shells methacryloxypropyltrimethoxysilane)]with different PMPS content have been successfully synthesized by emulsion polymerization of MPS(3 methacryloxypropyltrimethoxysilane )wherein WPU was used as a macromolecular emulsifier. Even though the latex was incorporated with PMPS based on solid of the latex )up to 50%, no coagulum occurred. The transmission electron microscopy (TEM )was used to confirm the core-shell morphology of composite latex particle. The particle size distribution of PMPS/WPU composite latex is determined by dynamic light scattering(DLS). Zeta potential tests showed the composite latex stability was associated with the MPS content. Solid-state  ²⁹Si NMR spectroscopy was used to confirm that PMPS led to hydrolysis and condensation reaction and thus a crosslinking inorganic structure Si-O-Si was formed in film of WPU/PMPS composite latex as cured at room temperature.

Key words: sol-gel, emulsion polymerizal, macromolecular emulsifier, core-shell structure, steric protection, 3-methacryloxypropyltrimethoxysilane