【摘要】 采用室内贮存试验、人工加速湿热老化试验和红外光谱法研究了硬质聚氨酯泡沫塑料在室内贮存条件下的老化机理。结果表明:随着老化时间的增加,10%定应变压缩应力和氨基甲酸酯指数不断下降,二者之间具有显著的相关性,室内贮存过程中,酯基水解是导致硬质聚氨酯泡沫塑料压缩性能下降的主要原因。更多还原

【Abstract】 The aging mechanism of rigid polyurethane foams at indoor storage conditions was investigated with indoor storage tests, accelerated hygrothermal aging tests and IR spectra. The results show that compressive stress at 10% strain and amino formic acid ester index decrease with aging time. It indicates that the hydrolysis of ester group is the main reason resulting in the decrease of compressive property of rigid polyurethane foams at indoor storage conditions.更多还原