In this study, mechanical characteristics of pre-strained polyisocyanurate foam were investigated based on the uniaxial compression test. The compression test procedure was divided into two steps: pre-straining and the typical compression test for the recovered specimen. To evaluate the effect of pre-straining, four different compressive strains were considered, and the temperature and the strain rate dependencies on its mechanical characteristics were analyzed. Test results showed that the recovery ratio decreased substantially for 0.85 (ambient temperature) and 0.25 (cryogenic temperature), and polyisocyanurate foam pre-strained at cryogenic temperature revealed an earlier start of densification. Based on the deformation mechanism of the polymeric foam, the collapse of cells in the pre-strained polyisocyanurate foam was addressed to explain the distinguished features in compressive mechanical characteristics regarding test conditions.

在这项研究中，基于单轴压缩试验研究了预应变聚异氰脲酸酯泡沫的力学特性。压缩测试程序分为两个步骤：预应变和对回收样品的典型压缩测试。为了评估预应变的效果，考虑了四种不同的压缩应变，并分析了温度和应变速率对其力学特性的依赖性。测试结果表明，在0.85（环境温度）和0.25（低温）下，回收率显着降低，并且在低温下预应变的聚异氰脲酸酯泡沫显示了较早的致密化开始。根据聚合物泡沫的变形机理，