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中文摘要：
以硅胶（SiO_2）和聚苯乙烯-丙烯酸（PSA）为原料制备SiO_2/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SiO_2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,SiO_2/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,SiO_2/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。
英文摘要：
SiO_2/PSA core-shell particles were prepared by silica（SiO_2） coated with poly（styreneco -acrylic acid）（PSA） membrane which was performed based on phase inversion principles.Non-solvent was introduced into the mixture of SiO_2 and PSA solution by vapor phase instead of liquid phase in the traditional way,in order to avoid the aggregation of particles.The resulting core-shell particles were characterized by Fourier transfer infrared spectrometry（FTIR）,scanning electron microscopy（SEM）,laser scattering particle analyzer,thermogravimetric analysis,mercury injection and nitrogen adsorption/desorption isotherms.The results showed that SiO_2/PSA composite particles obtained core-shell structure and the surface morphologies were regulated by the concentration of PSA solution.Compared to the SiO_2 particles, the porosity,surface area,pore volume and pore diameter of SiO_2/PSA core-shell composite particles significantly decreased because of the dense PSA shell on silica.
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