In this work, the effect of fumed silica on the long-term resistance of high-density polyethylene was investigated. Different amounts of functionalized fumed silica nanoparticles were dispersed in a high-density polyethylene matrix by melt compounding, and compression molded specimens were tested under tensile mode in the quasi-static ramp and creep conditions. In particular, tensile tests at different speeds and temperatures and the subsequent application of the modified Ree–Eyring model allowed the determination of an analytical expression correlating the strain rate with the yield stress and the testing temperature. It was demonstrated that the introduction of fumed silica led to a significant drop in the deformation rate, especially at elevated filler amounts. Creep tests showed that the nanofiller addition led to a progressive reduction of the critical deformation values. The application of this engineering approach evidenced how nanosilica introduction led to a systematic increase of the time-to-failure values, and good accordance between theoretical prediction and experimental measurements was found.

中文翻译：

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高密度聚乙烯-二氧化硅纳米复合材料的寿命评估

在这项工作中，研究了气相二氧化硅对高密度聚乙烯长期耐受性的影响。将不同量的功能化气相二氧化硅纳米粒子通过熔融复合分散在高密度聚乙烯基体中，并在准静态斜坡和蠕变条件下在拉伸模式下测试压缩成型样品。特别是，在不同速度和温度下进行拉伸试验以及随后应用修改后的 Ree-Eyring 模型可以确定将应变率与屈服应力和测试温度相关联的解析表达式。结果表明，气相法二氧化硅的引入导致变形率显着下降，尤其是在填料量增加的情况下。蠕变试验表明，纳米填料的添加导致临界变形值逐渐降低。这种工程方法的应用证明了纳米二氧化硅的引入如何导致失效时间值的系统增加，并且发现理论预测和实验测量之间具有良好的一致性。