In this study, it was investigated that the validity of small punch (SP) test for the lifetime prediction of polyvinyl chloride (PVC) resin used as an electric insulation material for the electric cable. The degradation behavior of PVC resin under the accelerated high-temperature condition was analyzed using Fourier transform-infrared spectroscopy (FT-IR), tensile testing, and SP testing. The activation energies and estimated lifetime obtained from the Arrhenius method were compared. The peak ratio of the carbonyl group obtained by FT-IR, the elastic modulus obtained by tensile testing, and the apparent elastic modulus obtained by SP testing were used as indicators for lifetime estimation, and the logarithm of these values showed a linear correlation with exposure time. The activation energy obtained from the apparent elastic modulus using SP testing was the smallest and the predicted lifetime was the shortest among all mechanical properties in this research. It indicates that SP testing is sensitive to the degradation. This is because the stress at the surface becomes maximum for SP testing, and the degradation occurs at the surface of the materials by priority degradation. SP testing is an excellent minimally destructive lifetime prediction method for detecting of early-stage degradation.

在这项研究中，调查了小冲孔（SP）测试对于用作电缆电绝缘材料的聚氯乙烯（PVC）树脂的寿命预测的有效性。使用傅里叶变换红外光谱（FT-IR），拉伸测试和SP测试分析了PVC树脂在加速高温条件下的降解行为。比较了从Arrhenius方法获得的活化能和估计寿命。通过FT-IR获得的羰基的峰比率，通过拉伸试验获得的弹性模量和通过SP试验获得的表观弹性模量被用作寿命估计的指标，并且这些值的对数与暴露量呈线性相关。时间。在这项研究中，使用SP测试从表观弹性模量获得的活化能最小，预计寿命最短。这表明SP测试对降级很敏感。这是因为表面的应力在SP测试中变为最大，并且由于优先降解而在材料表面发生了降解。SP测试是一种用于检测早期退化的极好的最小破坏性寿命预测方法。并且通过优先降解在材料表面发生降解。SP测试是一种用于检测早期退化的极好的最小破坏性寿命预测方法。并且通过优先降解在材料表面发生降解。SP测试是一种用于检测早期退化的极好的最小破坏性寿命预测方法。