SYNTHESIS AND CHARACTERIZATION OF HYPERBRANCHED POLYURETHANES PREPARED FROM BLOCKED ISOCYANATE MONOMERS BY STEP-GROWTH POLYMERIZATION

被引：161

作者：

SPINDLER, R ^{[1
]}

FRECHET, JMJ ^{[1
]}

机构：

[1] CORNELL UNIV,DEPT CHEM,BAKER LAB,ITHACA,NY 14853

来源：

MACROMOLECULES | 1993年 / 26卷 / 18期

关键词：

D O I：

10.1021/ma00070a013

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 step-growth polymerization of the AB2 blocked isocyanate monomr 3,5-bis((benzoxycarbonyl)imino)benzyl alcohol at a monomer concentration of 1 M results in the formation of a hyperbranched polyurethane with M(W) = 34 000. When the monomer concentration is increased to 2 M, a cross-linked polymer forms through the occurrence of a small amount of side reactions involving free isocyanate intermediates. Soluble polymers can be prepared, independent of the monomer concentration, when an end-capping alcohol is added at the start of the polymerization. The end-capping groups change the physical properties of the polymers such as T(g) and solubility.

引用

页码：4809 / 4813

页数：5

共 27 条

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