Effect of isocyanate index on the properties of rigid polyurethane foams blown by HFC 365mfc

被引：54

作者：

Kim, Sung Hee ^{[1
]}

Kim, Byung Kyu ^{[1
]}

Lim, Ho ^{[2
]}

机构：

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

[2] Korea Polyol Co, Ulsan 680090, South Korea

来源：

MACROMOLECULAR RESEARCH | 2008年 / 16卷 / 05期

关键词：

rigid polyurethane foam (RPUF); isocyanate index; cell structure; density; compression strength; dimensional stability; thermal conductivity;

D O I：

10.1007/BF03218546

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Rigid polyurethane foams (RPUFs) were fabricated from crude MDI (CMDI) and polypropylene glycols (PPGs) of various isocyanate indices with a physical blowing agent (HFC 365mfc). There was a tendency for the gel time to decrease and the tack-free time to increase with increasing index value. With increasing index value the foam density and compression strength decreased and the glass transition temperature, dimension stability and thermal insulation increased, while the cell size and closed cell content were virtually unchanged. Allophanate crosslinks and condensation reactions between the isocyanate groups, which are favored with a high index value, exerted significant effects on the properties of RPUFs.

引用

页码：467 / 472

页数：6

共 26 条

[1] Development and validation of novel DH-GC-ITMS methods for the determination of Freon F-141b in formulated polyol and rigid polyurethane foam [J].