MORPHOLOGY OF BLOCK COPOLYURETHANES .4. EFFECT OF SYNTHETIC PROCEDURE ON CHAIN STRUCTURE

被引：26

作者：

WANG, TLD ^{[1
]}

LYMAN, DJ ^{[1
]}

机构：

[1] UNIV UTAH,DEPT MAT SCI & ENGN,SALT LAKE CITY,UT 84112

来源：

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | 1993年 / 31卷 / 08期

关键词：

COPOLYURETHANES; COPOLYETHER-URETHANE-UREAS; SYNTHESIS; MORPHOLOGY; INFRARED SPECTRA;

D O I：

10.1002/pola.1993.080310806

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Analysis of products formed in the end-capping step during the synthesis of two block copolyurethanes being studied as biomedical materials has shown the presence of dimeric soft segments and free diisocyanate. In this standard two-step synthesis, the presence of these compounds lead to block copolyether-urethane-ureas containing sizeable amounts of dimeric hard and soft segments. These standard copolymers are compared in terms of IR spectra, stress-strain properties, and dynamic mechanical properties to their pure analogs which contain no dimeric segments.

引用

页码：1983 / 1995

页数：13