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首页> 外文会议>International Conference on Advanced Fibers and Polymer Materials(ICAFPM 2005) vol.2; ICAFPM 2005 vol.2; 20051019-21; 20051019-21; Shanghai(CN); Shanghai(CN) >Preparation of Particle-arrayed Polymer Matrix via Immobilization of Colloidal Crystals Formed by Polymer-grafted Silica Particles in Gels
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Preparation of Particle-arrayed Polymer Matrix via Immobilization of Colloidal Crystals Formed by Polymer-grafted Silica Particles in Gels

机译：固定化凝胶中聚合物接枝二氧化硅颗粒形成的胶体晶体制备颗粒排列的聚合物基质

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摘要

Colloidal crystallization of polymer-modified silica in organic solvent and incorporation of the colloid crystals into polymer matrix were investigated. Colloidal crystallization of Polymer-grafted silica (78 or 136 nm) was observed in organic solvents, which were polar and good ones for modified polymer. The crystallization was confirmed to occur due to the electrostatic repulsion between the modified silica in the suspension. Neighbouring inter-particle distances in the colloidal crystals were fairly longer than length of grafted polymer chains. Colloidal crystals formed by polymer-grafted silica particles were immobilized by a step-wise procedure consisting of gelation by radical copolymerization followed by solidification by further polymerization. In the first step, the poly(methyl methacrylate)-grafted silica colloidal crystal suspension was successfully incorporated into the gel by copolymerization of methyl methacrylate (MMA) and 1,2-dimethylacryloyloxyethane (DME). The second radical polymerization of vinylidene-1,3-dioxolane, MMA or trifluoroethyl methacrylate (TFEMA) was performed after substituting the solvent with each monomer. By this two-step procedure, the silica particle array of colloidal crystals was immobilized to make into durable material.
机译：研究了聚合物改性二氧化硅在有机溶剂中的胶体结晶以及将胶体晶体掺入聚合物基质的过程。在有机溶剂中观察到聚合物接枝的二氧化硅（78或136 nm）的胶体结晶，该溶剂是极性的，是改性聚合物的良好溶剂。确认由于悬浮液中改性二氧化硅之间的静电排斥而发生结晶。胶体晶体中相邻的粒子间距离远长于接枝的聚合物链的长度。由聚合物接枝的二氧化硅颗粒形成的胶体晶体通过逐步步骤固定化，该逐步步骤包括通过自由基共聚进行凝胶化，然后通过进一步聚合进行固化。第一步，通过甲基丙烯酸甲酯（MMA）和1,2-二甲基丙烯酰氧基乙烷（DME）的共聚，成功地将聚甲基丙烯酸甲酯接枝的二氧化硅胶体晶体悬浮液掺入凝胶中。用各单体取代溶剂后，进行亚乙烯基-1，3-二氧戊环，MMA或甲基丙烯酸三氟乙酯（TFEMA）的第二次自由基聚合。通过该两步法，将胶体晶体的二氧化硅颗粒阵列固定化以制成耐用材料。

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