Precise synthesis of dendrimer-like star-branched poly(methyl methacrylate)s up to seventh generation by an iterative divergent approach involving coupling and transformation reactions

被引：75

作者：

Hirao, A ^{[1
]}

Matsuo, A ^{[1
]}

Watanabe, T ^{[1
]}

机构：

[1] Tokyo Inst Technol, Grad Sch Sci & Engn, Dept Organ & Polymer Mat, Meguro Ku, Tokyo 1528552, Japan

来源：

MACROMOLECULES | 2005年 / 38卷 / 21期

关键词：

D O I：

10.1021/ma050762k

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The synthesis of dendrimer-like star-branched poly(methyl methacrylate)s (PMMAs) were carried out by an iterative divergent approach which involved a coupling reaction of alpha-functionalized living PMMA with two tert-butyldimethylsilyloxymethylphenyl (SMP) groups with benzyl bromide (BnBr) chain-end-functionalized PMMA and a transformation reaction of the introduced SMP groups into BnBr functionalities. The dendrimer-like star-branched PMMAs up to the seventh generation have been successfully synthesized by repeating these two reactions seven times. The resulting polymers all were well-defined in branched architecture, precisely controlled in chain length and degree of end-functionality, and extremely narrow in molecular weight distribution (M-w/M-n < 1.03). The seventh-generation PMMA herein synthesized was 1.97 x 10(6) in M-w value and consisted of 508 PMMA segments. Furthermore, the 512 SMP termini were presented along its periphery. Viscosity measurement indicates that the dendrimer-like star-branched polymer in each generation possesses smaller hydrodynamic volume than the corresponding linear polymer with the same molecular weight. The g' value became smaller as the generation proceeded.

引用

页码：8701 / 8711

页数：11

共 52 条

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