Preparation of silica-poly styrene core-shell particles up to micron sizes
Preparation of silica-poly styrene core-shell particles up to micron sizes
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DOI：
10.1016/j.jcis.2004.01.056
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发表时间：
2004-04-15
影响因子：
9.9
通讯作者：
Konno, M
中科院分区：
文献类型：
--
作者：
Gu, SC;Kondo, T;Konno, M
提出了一种制备具有聚苯乙烯壳的二氧化硅核复合颗粒的方法。以正硅酸乙酯为原料，在水-乙醇-氨水溶液中，采用Stober法通过缩合和水解制备了二氧化硅颗粒。用偶联剂甲基丙烯酰氧基丙基三甲氧基硅烷（MPTMS）对二氧化硅颗粒进行表面改性，以将乙烯基基团引入到颗粒表面上。苯乙烯的聚合是在二氧化硅颗粒的存在下用引发剂过硫酸钾（KPS）和阴离子单体对苯乙烯磺酸钠（NaSS）进行的。在这些涂覆实验中，二氧化硅颗粒的平均尺寸随着MPTMS（0-10 mmol/l）、NaSS（0 - 10 mmol/l）、KPS（4-12 mmol/l）和苯乙烯（0.12-0.4 mol/l）的浓度范围从339 nm变化至1210 nm。反应条件的选择使得能够制备含有一个二氧化硅核的复合颗粒。复合粒子的粒径分布的变异系数小于7%，壳层厚度在125至410 nm的范围内。(C)2004年爱思唯尔公司All rights reserved.
A method for producing silica-core composite particles with a polystyrene shell is proposed. Silica particles were prepared by the Stober method through condensation and hydrolysis of tetraethyl orthosilicate in a water-ethanol-ammonia solution. The silica particles were the surface-modified with a coupling reagent, methacryloxypropyltrimethoxysilane (MPTMS), to introduce vinyl groups onto the particle surfaces. Polymerization of styrene was conducted with an initiator, potassium persulfate (KPS), and an anionic monomer, sodium p-styrenesulfonate (NaSS), in the presence of the silica particles. In these coating experiments, the average size of the silica particles was varied from 339 to 1210 nm with the concentration ranges of MPTMS (0-10 mmol/1), NaSS (0-10 mmol/1), KPS (4-12 mmol/1), and styrene (0.12-0.4 mol/1). Selection of reaction conditions enabled the preparation of composite particles that contained one core of silica. The coefficient of variance of size distribution of the composite particles was less than 7%, and shell thickness was in the range 125 to 410 nm. (C) 2004 Elsevier Inc. All rights reserved.