Nanoclay-modified rigid polyurethane foam

被引:146
作者
Widya, T [1 ]
Macosko, CW [1 ]
机构
[1] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA
来源
JOURNAL OF MACROMOLECULAR SCIENCE-PHYSICS | 2005年 / B44卷 / 06期
关键词
montmorillonite-based organo clay; polyurethane foams; thermal insulation;
D O I
10.1080/00222340500364809
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Montmorillonite-based organoclay was incorporated into rigid polyurethane foams. Clay was dispersed first in the isocyanate component ultrasonically. The dispersion was investigated using small angle X-ray scattering and rheology. It was found that using toluene as common solvent enhanced dispersion significantly. The addition of 1 wt% clay resulted in reduced cell size from 0.40 to 0.28 mm and increased cell number density on 300-index foams. Gas chromatography showed that diffusion of blowing agent out of the closed cells of the foam decreased by more than 82% with clay loading. The reduction in permeability is caused by the combined effect of smaller cell size and dispersed nanoclay acting as diffusion barrier. At 1% clay no mechanical strength improvements were observed. Higher levels of clay loading caused significant viscosity increase and a yield stress that made mixing the reactive components difficult.
引用
收藏
页码:897 / 908
页数:12
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