MORPHOLOGY, THERMAL AND MECHANICAL-PROPERTIES OF SOLUTION-CAST POLYURETHANE FILMS

被引：40

作者：

FOKS, J ^{[1
]}

JANIK, H ^{[1
]}

RUSSO, R ^{[1
]}

机构：

[1] IST RIC TECNOL POLIMERI & REOL,NAPLES,ITALY

来源：

EUROPEAN POLYMER JOURNAL | 1990年 / 26卷 / 03期

关键词：

D O I：

10.1016/0014-3057(90)90246-Z

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Solution-cast films of segmented polyurethanes based on poly(ethylene adipate)glycol, 4,4′-diphenylmethanediisocyanate and 1,4-butanediol have been investigated. Optical and electron microscopic studies revealed different amounts of birefringent aggregates, related to the casting temperature. In all the samples, the soft and hard segment crystallization took place and the samples were heterogeneous. Mechanical properties determined by stress-strain analysis, hysteresis at 50% elongation and dynamic mechanical analysis were consistent with phase-separated systems. Samples cast at higher temperatures (130, 145°) contained more soft and hard segment in the crystalline state than a sample cast at lower temperature (70°) and they had higher Young's modulus and hysteresis. The increase of hysteresis and permanent set was particularly attributed to the increase of crystallinity of the soft segment. © 1990.

引用

页码：309 / 314

页数：6

共 17 条

[1] INVESTIGATION OF 2 CRYSTAL FORMS IN MDI BDO-BASED POLYURETHANES [J].