Temperature-sensitive amorphous polyurethanes

被引：11

作者：

Park, SH ^{[1
]}

Kim, JW ^{[1
]}

Lee, SH ^{[1
]}

Kim, BK ^{[1
]}

机构：

[1] Pusan Natl Univ, Dept Polymer Sci & Engn, Pusan 609735, South Korea

来源：

JOURNAL OF MACROMOLECULAR SCIENCE-PHYSICS | 2004年 / B43卷 / 02期

关键词：

shape-memory polymer; 1,3-butane diol; hexamethylene diisocyanate; dynamic mechanical thermal analyzer;

D O I：

10.1081/MB-120029780

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Shape-memory polymers based on segmental polyurethanes (PUs) were synthesized from 1,3-butane diol (1,3-BD), hexamethylene diisocyanate (HDI), and 4,4'-diphenylmethane diisocyanate (MDI), and characterized in terms of thermomechanical, dynamic mechanical, theological, and thermal properties. It was found that soft segments (1,3-BD and HDI) and hard segments (1,3-BD and MDI) were well phase mixed to give a single glass transition temperature (T-g) that was easily controlled by hard segment content. With the increase in hard segment content, T-g, melt viscosity, rubbery plateau, modulus, relaxation time, and shape recovery increased, and shape fixability for repeated cycles decreased.

引用

页码：447 / 458

页数：12