以硅胶(SiO2)和聚苯乙烯-丙烯酸(PSA)为原料制备SiO2/PSA核壳结构型复合粒子.在相转化法制备聚合物薄膜的基础上,为避免粒子团聚提出以蒸汽方式代替传统的液滴方式,将非溶剂缓慢而均匀地加入SiO2与PSA溶液的混合物中.采用红外光谱、扫描电子显微镜、激光粒度分析仪、热重分析、压汞仪和氮气吸附/脱附等方法对粒子的化学组成、形貌、粒径分布以及多孔结构特性作了分析和表征.结果表明,SiO2/PSA复合粒子具有核壳结构,颗粒的分散性较好,PSA利用率几乎达到100%.聚合物溶液的浓度直接影响核壳粒子的表面形貌.与纯硅胶颗粒相比,由于致密的PSA膜覆盖在多孔硅胶上,SiO2/PSA核壳复合粒子的孔隙率、比表面积、孔体积和平均孔径都大幅下降.
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