Film-forming polystyrene/poly(n-butyl acrylate-co-glycidyl methacrylate) [PS/P(BA-co-GMA)] core-shell latex particles were prepared via a two-stage emulsion polymerization procedure using a polystyrene latex seed. Delayed addition of GMA was used in order to locate functional epoxy groups close to the particle surfaces. It was found that a temperature of 25 degrees C at the second-stage polymerization, in combination with a redox initiator system, was essential for the formation of a uniform shell of BA-GMA copolymer around the PS core. The latex particle morphology was investigated by transmission electron microscopy (TEM). Reactive double bonds were introduced into the particle shells in order to produce a film-forming latex system that could be cured by ultraviolet (UV)-radiation without any need to use reactive multifunctional monomers or oligomers as crosslinkers. The surface-bound epoxy groups were used as grafting sites for amine or carboxyl functional unsaturated monomers, respectively. The grafting was demonstrated by Fourier transform infrared (FTIR) spectroscopy. Films prepared from modified and unmodified latexes were exposed to UV radiation in the presence of a photoinitiator. Crosslinking was tested by thermal mechanical analysis (TMA) and by determination of swelling and gel content of exposed films. It was demonstrated that films from the modified latexes after irradiation had significantly higher stiffness and gel content and showed lower swelling than unmodified ones. (C) 1996 John Wiley & Sons, Inc. [References: 30]
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机译：形成膜的聚苯乙烯/聚（丙烯酸正丁酯-甲基丙烯酸共缩水甘油酯）[PS / P（BA-co-GMA）]核-壳胶乳颗粒是通过使用聚苯乙烯胶乳种子的两阶段乳液聚合方法制备的。使用延迟添加GMA的目的是将官能团环氧基团定位在靠近颗粒表面的位置。发现在第二阶段聚合时的温度为25℃，与氧化还原引发剂体系结合，对于在PS核周围形成BA-GMA共聚物的均匀壳至关重要。通过透射电子显微镜（TEM）研究了乳胶颗粒的形态。将反应性双键引入颗粒壳中，以产生可以通过紫外线（UV）辐射固化的成膜胶乳体系，而无需使用反应性多功能单体或低聚物作为交联剂。表面结合的环氧基分别用作胺或羧基官能不饱和单体的接枝位点。通过傅里叶变换红外（FTIR）光谱证明了接枝。在光引发剂的存在下，将由改性和未改性胶乳制备的薄膜暴露于紫外线辐射下。交联通过热机械分析（TMA）以及暴露薄膜的溶胀和凝胶含量测定进行测试。结果表明，改性后的乳胶膜在辐照后具有明显更高的刚度和凝胶含量，并且溶胀性低于未改性的膜。 （C）1996 John Wiley＆Sons，Inc. [参考：30]
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