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首页> 外文期刊>Colloid and polymer science >Effects of particle volume fraction on distortion of particle-arrayed structure during immobilization of colloidal crystals formed by poly (methyl methacrylate)-grafted silica in acetonitrile
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Effects of particle volume fraction on distortion of particle-arrayed structure during immobilization of colloidal crystals formed by poly (methyl methacrylate)-grafted silica in acetonitrile

机译:聚甲基丙烯酸甲酯接枝二氧化硅形成的胶体晶体固定在乙腈中时,颗粒体积分数对颗粒排列结构变形的影响

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摘要

Changes of particle array structure with particle volume fraction during immobilization of colloidal crystals, formed by poly(methyl methacrylate)-grafted silica in acetonitrile, were investigated. Immobilization of colloidal crystals formed in acetonitrile was carried out by two-step photo-radical copolymerization of methyl methacrylate and ethylene dimethacrylate to make organogel, followed by solidification after exchanging the solvent with methyl methacrylate. Crystallite size in colloidal crystals formed in acetonitrile was mostly unchanged with particle volume fraction in the range of 0.11-0.18, while the size and number of single crystals decreased during gelation. Disordering in particle array in immobilized colloidal crystals in gel and poly(methyl methacrylate) matrix was observed to decrease with increasing particle volume fraction less than 0.18 due to strong electrostatic repulsion between particles.
机译:研究了由聚甲基丙烯酸甲酯接枝的二氧化硅在乙腈中形成的胶体晶体固定过程中,颗粒阵列结构随颗粒体积分数的变化。通过甲基丙烯酸甲酯和二甲基丙烯酸乙二酯的两步光自由基共聚反应制得有机凝胶,然后在用甲基丙烯酸甲酯交换溶剂后进行固化,从而固定在乙腈中形成的胶体晶体。在乙腈中形成的胶体晶体中的微晶尺寸基本不变,颗粒体积分数在0.11-0.18范围内,而在胶凝过程中单晶的尺寸和数量减小。观察到凝胶和聚(甲基丙烯酸甲酯)基质中固定的胶体晶体中的颗粒阵列中的无序现象由于颗粒之间的强静电排斥作用而随着增加的颗粒体积分数小于0.18而减少。

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