ABSTRACT

Optimal formulation of wood-plastic composites (WPCs) from recycled polypropylene (rPP) and rubberwood flour (RWF) was determined. Mechanical properties and long-term creep behaviour of rPP and WPCs were investigated. This study revealed that an increasing of rubberwood flour content clearly increases the flexural, compressive, and tensile values. The modulus of composite samples linearly increased with an increasing amount of RWF. The creep behaviour test with load levels at 20, 30, and 40% of the ultimate flexural strength were conducted for 1000 h. The deflection of the composites at the same load levels of rPP gave the higher creep behaviour (2.45, 4.65, and 6.68 mm) than that of WPCs (1.53, 2.41, and 3.37 mm), respectively. Six-element for determining Burger model parameters was well fitted with the long-term creep of WPCs, this deflection result was compared to four-element Burger and Power law models. Finally, the master curve could predict lifetime of composite materials.

摘要

确定了由再生聚丙烯 (rPP) 和橡胶木粉 (RWF) 制成的木塑复合材料 (WPC) 的最佳配方。研究了 rPP 和 WPC 的机械性能和长期蠕变行为。这项研究表明，橡胶木粉含量的增加明显增加了弯曲、压缩和拉伸值。复合材料样品的模量随着RWF量的增加而线性增加。蠕变行为试验在极限弯曲强度的 20%、30% 和 40% 的负载水平下进行了 1000 小时。在相同负载水平下，rPP 复合材料的挠度分别比 WPC（1.53、2.41 和 3.37 mm）具有更高的蠕变行为（2.45、4.65 和 6.68 mm）。确定 Burger 模型参数的六元模型很好地拟合了 WPC 的长期蠕变，该偏转结果与四元伯格模型和幂律模型进行了比较。最后，主曲线可以预测复合材料的寿命。