Immobilization of semisoft colloidal crystals formed by polymer-brush-afforded hybrid particles.
Immobilization of semisoft colloidal crystals formed by polymer-brush-afforded hybrid particles.
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DOI：
10.1021/la5011488
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发表时间：
2014-06
期刊：
影响因子：
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通讯作者：
Yun Huang;T. Morinaga;Yugo Tai;Y. Tsujii;K. Ohno
中科院分区：
文献类型：
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作者：
Yun Huang;T. Morinaga;Yugo Tai;Y. Tsujii;K. Ohno
报道了一种表面引发活性自由基聚合(SI-LRP)合成的有序排列的聚合物刷杂化粒子半软胶体晶体的固定化技术。通过SI-LRP首次将二氧化硅粒子接枝到聚甲基丙烯酸甲酯-甲基丙烯酸羟乙酯-b-聚甲基丙烯酸甲酯、P(MMA-co-HEMA)-b-PMMA嵌段共聚物上，接枝密度高达0.7链/nm(2)。HEMA单元与甲基丙烯酸2-异氰酸乙酯反应，在聚合物刷壳的外层引入乙烯基。改性后的杂化粒子在含有少量带乙烯基团的自由聚合物的溶液中形成胶体晶体。胶体晶体在光引发剂存在的情况下被光照射，以通过乙烯基团之间的交联反应将其固定化。用激光共聚焦扫描显微镜对光照射前后的胶体晶体进行了结构分析，结果表明，固定化后的胶体晶体保持了周期性的结构。
An immobilization technique for semisoft colloidal crystals, which are ordered arrays of polymer-brush-afforded hybrid particles synthesized by surface-initiated living radical polymerization (SI-LRP), is reported. Silica particles were first grafted with well-defined block copolymers of poly(methyl methacrylate-co-hydroxyethyl methacrylate)-b-poly(methyl methacrylate), P(MMA-co-HEMA)-b-PMMA by SI-LRP, which gave a graft density as high as 0.7 chains/nm(2). The HEMA units reacted with 2-isocyanatoethyl methacrylate to introduce vinyl groups at the outer layer of the polymer-brush shell. The modified hybrid particles formed a colloidal crystal in a solution containing a small amount of free polymers with vinyl groups. The colloidal crystal was photoirradiated in the presence of a photoradical initiator to immobilize it through a cross-linking reaction among the vinyl groups. The structural analyses of the colloidal crystals before and after the photoirradiation were carried out by confocal laser scanning microscopy; the results showed that the periodic structures of the crystals were maintained after immobilization.