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硅胶/聚苯乙烯--丙烯酸核壳结构复合粒子的制备和表征

Keywords: 无机非金属材料,?复合粒子,?核壳结构,?相转化法,?孔结构

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Abstract:

?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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