Precise synthesis of dendrimer-like star-branched poly(methyl methacrylate)s with different branched architectures up to third-generation by iterative methodology

被引：11

作者：

Watanabe, Takumi ^{[1
]}

Hirao, Akira ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Organ & Polymer Mat, Grad Sch Sci & Engn, Meguro Ku, H-127,2-12-1 Ohokayama, Tokyo 1528552, Japan

来源：

MACROMOLECULAR SYMPOSIA | 2006年 / 245卷

关键词：

branched architecture; dendrimer-like star-branched polymer; iterative divergent methodology; living anionic polymerization; poly(methyl methacrylate);

D O I：

10.1002/masy.200651302

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Four kinds of dendrimer-like star-branched poly(methyl methacrylate)s (PMMA)s with different branched architectures have been synthesized up to the third-generation by developing the iterative divergent methodology which involves the following two elementary reactions: (a) a coupling reaction between alpha-functionalized living anionic PMMA having two or four 3-tert-butyidimethyl-silyloxymethylphenyl (SMP) groups and benzyl bromide (BnBr)-multi-functionalized core compound(s) or BnBr-chain-end-multi-functionalized PMMA, and (b) a transformation reaction of the introduced SMP group into BnBr function. The number of segments branched at the junction point could be readily controlled by adjusting BnBr reaction sites of the core and the polymer chain-end in number. Characterization results on molecular weight, molecular weight distribution, and end-group functionality revealed that the resulting branched polymers all herein synthesized were well-defined in branched architecture and precisely controlled in chain length. in order to evaluate the solution properties of the third-generation polymers, their viscosities and hydrodynamic radii were measured by viscometer and RALLS, respectively, and discussed.

引用

页码：5 / 13

页数：9

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