Precise surface structure control of inorganic solid and metal oxide nanoparticles through surface-initiated radical polymerization
Precise surface structure control of inorganic solid and metal oxide nanoparticles through surface-initiated radical polymerization
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DOI：
10.1016/j.stam.2006.07.008
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发表时间：
2006-10-01
影响因子：
5.5
通讯作者：
Takahara, Atsushi
中科院分区：
文献类型：
--
作者：
Kobayashi, Motoyasu;Matsuno, Ryosuke;Takahara, Atsushi
采用表面引发自由基聚合法对无机固体和金属氧化物纳米粒子进行表面改性。通过聚合物直接接枝反应，在纳米Fe 3 O 4（d = 10和25 nm）和纳米TiO 2（d = 15 nm）表面制备了新型（无机纳米粒子/聚合物）纳米复合材料。将含磷酸基团的氮氧自由基聚合引发剂化学吸附到纳米粒子上，在其表面形成可控的聚苯乙烯（PS）和聚（3-乙烯基吡啶）（P3 VP）接枝层。PS和P3 VP修饰的纳米粒子在有机溶剂中分散良好，而质子化的P3 VP修饰的磁铁矿纳米粒子分散在水相中。通过显微镜观察证实了纳米颗粒在聚合物基体中的精细分散。为了实现摩擦学控制，甲基丙烯酸（2，2-二甲基-1，3-二氧戊环-4-基）甲酯的原子转移自由基聚合也从固定化引发剂在平坦的硅片上进行，导致高密度聚合物刷，其随后转化为由甲基丙烯酸2，3-二羟丙酯单元组成的亲水性聚合物刷。聚（2，3-二羟丙基甲基丙烯酸酯）刷固定表面在水中表现出低的动摩擦系数，由于高度稳定的亲水性。(c)2006 NIMS和Elsevier Ltd.保留所有权利。
Surface-initiated radical polymerization was carried out in order to modify the surface of inorganic solid and metal oxide nanoparticles. Novel (inorganic nanoparticles/polymer) nanocomposites were prepared through a direct polymer grafting reaction from the surfaces of magnetite (Fe3O4) (d = 10 and 25 nm) and titanium oxide (TiO2) (d = 15 nm) nanoparticles. The initiator for nitroxide-mediated radical polymerization with a phosphoric acid group was chemisorbed onto the nanoparticles and gave controlled polystyrene (PS) and poly(3-vinylpyridine) (P3VP) graft layers on their surfaces. The PS- and P3VP-modified nanoparticles were finely dispersed in organic solvents, whereas protonated P3VP-modified magnetite nanoparticles were dispersed in aqueous phase. The fine dispersion of nanoparticles in the polymer matrix was confirmed by microscopic observation. In order to realize tribological control, atom transfer radical polymerization of (2,2-dimethyl-1,3-dioxolan-4-yl)methyl methacrylate was also carried out from an immobilized initiator on a flat silicon wafer, resulting in a high-density polymer brush that was subsequently converted to a hydrophilic polymer brush consisting of 2,3-dihyroxypropyl methacrylate units. The poly(2,3-dihydroxypropyl methacrylate) brush-immobilized surface showed a low dynamic friction coefficient in water due to the highly stable hydrophilicity. (c) 2006 NIMS and Elsevier Ltd. All rights reserved.