Controlled cyclotrimerization in hyperbranched polymer synthesis

被引：22

作者：

Higuchi, M ^{[1
]}

Kanazawa, H ^{[1
]}

Tsuruta, M ^{[1
]}

Yamamoto, K ^{[1
]}

机构：

[1] Keio Univ, Fac Sci & Technol, Dept Chem, Yokohama, Kanagawa 2238522, Japan

来源：

MACROMOLECULES | 2001年 / 34卷 / 26期

关键词：

D O I：

10.1021/ma0111461

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Cyclization in hyperbranched polymer synthesis was first controlled on the basis of a steric effect using a Lewis acid with a bulky ligand. Only phenylazomethine oligomers having a cyclic structure were formed during the polymerization of 4,4'-diaminobenzophenone in the presence of TiCl4(THF)(2) as a Lewis acid with bulky ligands. The structure of a cavity in an isolated cyclic oligomer was determined by X-ray crystal analysis. Controlled cyclization is applied for hyperbranched polymer synthesis, and a novel dendrimer with a cyclic structure was quantitatively obtained via controlled cyclization on the basis of a steric effect using a monomer with a bulky dendron.

引用

页码：8847 / 8850

页数：4

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