Preparation of magnetic polystyrene nanoparticles by the controlled/"living" free radical polymerization of styrene

被引:4
作者
Chen Zhi-Jun [1 ]
Peng Kai
Fang Shao-Ming
Tian Jun-Feng
Li Ding-Ding
Jia Lu-Jun
Mao Xiao-Feng
机构
[1] Zhengzhou Univ Light Ind, Coll Mat & Chem Engn, Dept Polymer Sci & Engn, Zhengzhou 450002, Peoples R China
[2] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
关键词
magnetite; nanoparticles; graft; magnetic polystyrene; controlled/"living" free radical polymerization;
D O I
10.3866/PKU.WHXB20070313
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Magnetite nanoparticles were synthesized by chemical coprecipitation of ferrous chloride and ferric sulfate. The obtained magnetite nanoparticles were surface-modified with 3-methacryloxypropyltrimethoxy silane(3-MPS) to form terminal vinyl groups as grafting sites. The polystyrene (PS)-grafted magnetite nanoparticles were prepared by controlled/"living" free radical polymerization by using benzoyl peroxide (BPO) as an initiator in the presence of 4-hydroxyl-2,2,6,6-tetramethyl-1-piperidinyloxy (HTEMPO center dot). XRD measurement showed the spinel structure for the magnetite nanoparticles. GPC analysis suggested the relationship between number average molecular weight of PS and polymerization time to be with approximate linear. The PS-grafted magnetite nanoparticles are uniform with diameters in the range from 20 nm to 30 nm from TEM. The content of magnetite in magnetic PS nanoparticles was 62.6% from the analysis of TG. The results of magnetic performance by VSM displayed that the magnetic PS nanoparticles exhibited the characteristics of single domain system when saturated magnetization was equal to 31.7 emu . g(-1).
引用
收藏
页码:349 / 354
页数:6
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