A versatile method to prepare RAFT agent anchored substrates and the preparation of PMMA grafted nanoparticles

被引：272

作者：

Li, C ^{[1
]}

Han, J ^{[1
]}

Ryu, CY ^{[1
]}

Benicewicz, BC ^{[1
]}

机构：

[1] Rensselaer Polytech Inst, NYS, Ctr Polymer Synthesis, Dept Chem & Chem Biol,Dept Chem & Biol Engn, Troy, NY 12180 USA

来源：

MACROMOLECULES | 2006年 / 39卷 / 09期

关键词：

D O I：

10.1021/ma051983t

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Well-defined polymer brushes grafted onto silica nanoparticles were prepared by reversible addition-fragmentation chain transfer polymerization (RAFT). A versatile RAFT agent, 4-cyanopentanoic acid dithiobenzoate (CPDB), was attached to amino-functionalized colloidal silica nanoparticles by direct condensation of the mercaptothiazoline-activated CPDB with the surface amino groups. RAFT polymerizations were then conducted from the particle surface to graft polymer brushes to the particles. The kinetics of methyl methacrylate and styrene surface RAFT polymerizations were investigated and compared with model polymerizations mediated by free CPDB. The MMA surface graft polymerization was more controlled than the solution polymerization mediated by free RAFT agent, indicated by the faster polymerization rate and narrower polydispersity. High-performance liquid chromatography techniques were used to quantitatively estimate the amount of ungrafted free polymer which was minimal compared with the grafted polymer.

引用

页码：3175 / 3183

页数：9

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