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Creep Analysis of Bamboo High-Density Polyethylene Composites: Effect of Interfacial Treatment and Fiber Loading Level

机译:竹高密度聚乙烯复合材料的蠕变分析:界面处理和纤维含量的影响

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摘要

The effect of chemical treatment at fiber-plastic interface and fiber loading level on creep property of bamboo fiber high-density polyethylene (BF/HDPE) composites was investigated. For single modifier systems, the use of maleic anhydride grafted polyethylene (PE-g-MA) as a coupling agent helped reduce the creep and achieved the optimum effect at the 5.7% loading level, The addition of either a semicrystalline or an amorphous MA grafted ethylene propylene rubber (sEPR-g-MA or aEPR-g-MA) as an impact modifier increased the creep. For the combined modifiers, the use of PE-g-MA in EPR-g-MA modified composites gradually improved creep performance. Four-element Burgers model was shown to fit measured creep data well only within the specified test period. However, both partially stretched Burgers (PSB) model and fully stretched Burgers (FSB) model could be applied for characterization and prediction when the stretching exponent was fixed at certain given values. The FSB model offered a better long-term prediction based on the short-term creep data. Time-temperature superposition technique produced smooth master creep curves through horizontal shifts, but it slightly over-predicted the long-term creep for most composite systems. POLYM. COMPOS., 32:692-699, 2011.
机译:研究了竹纤维高密度聚乙烯(BF / HDPE)复合材料在纤维-塑料界面和纤维含量下的化学处理对蠕变性能的影响。对于单改性剂体系,使用马来酸酐接枝的聚乙烯(PE-g-MA)作为偶联剂有助于减少蠕变并在5.7%的负载水平下达到最佳效果。添加半结晶或无定形的MA接枝乙丙橡胶(sEPR-g-MA或aEPR-g-MA)作为抗冲改性剂会增加蠕变。对于组合的改性剂,在EPR-g-MA改性的复合材料中使用PE-g-MA逐渐改善了蠕变性能。结果表明,只有在指定的测试期间内,四元素Burgers模型才能很好地拟合测得的蠕变数据。但是,当将拉伸指数固定在某些给定值时,部分拉伸的Burgers(PSB)模型和完全拉伸的Burgers(FSB)模型都可以用于表征和预测。 FSB模型基于短期蠕变数据提供了更好的长期预测。时间-温度叠加技术通过水平移位产生了平滑的主蠕变曲线,但是对于大多数复合系统而言,它稍微高估了长期蠕变。 POLYM。 COMPOS。,32:692-699,2011。

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