Effects of environment on the properties of low-density polyethylene composites reinforced with pineapple-leaf fibre
Effects of environment on the properties of low-density polyethylene composites reinforced with pineapple-leaf fibre
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DOI：
10.1016/s0266-3538(97)00161-9
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发表时间：
1998-01-01
影响因子：
9.1
通讯作者：
Thomas, S
中科院分区：
文献类型：
--
作者：
George, J;Bhagawan, SS;Thomas, S
通过浸泡在28、50和70℃蒸馏水中，研究了水环境对菠萝叶短纤维增强低密度聚乙烯复合材料（PALF/LDPE）吸附特性的影响，并评估了纤维负载、温度和化学处理对吸附行为的影响。由于纤维素含量增加，吸水率随着纤维负载量的增加而增加。复合材料在高温下的重量变化曲线表明扩散接近 Fickian。所有经过处理的复合材料的吸收率都低于未改性的复合材料。确定了扩散、吸附和渗透系数等参数并计算了活化能。评估了熵、焓和一级动力学速率常数等热力学常数。评估了理论和实验吸附结果之间的相关性。还研究了吸水率对单轴拉伸性能的影响。接触水后机械性能会下降，具体取决于浸泡时间、纤维负载和化学处理。最后，对PALF/LDPE复合材料在紫外线照射下的弯曲性能进行了研究。 (C) 1998 Elsevier Science Ltd. 保留所有权利。
The influence of water environment on the sorption characteristics of low-density polyethylene composites reinforced with short pineapple-leaf fibers (PALF/LDPE) has been studied by immersion in distilled water at 28, 50 and 70 degrees C. The effects of fiber loading, temperature and chemical treatment on the sorption behavior are also evaluated. Water uptake is found to increase with fiber loading owing to the increased cellulose content. Weight change profiles for the composites at high temperature indicated that the diffusion is close to Fickian. All of the treated composites showed lower uptake than the unmodified composites. Parameters like diffusion, sorption and permeability coefficients were determined and activation energies were calculated. The thermodynamic constants such as entropy, enthalpy and first-order kinetic rate constant have been evaluated. A correlation between theoretical and experimental sorption results was evaluated. The effect of water uptake on uniaxial tensile properties has also been studied. Mechanical properties decreased after exposure to water, depending on time of immersion, fiber loading and chemical treatment. Finally, studies were carried out on the flexural properties of PALF/LDPE composites exposed to ultraviolet radiation. (C) 1998 Elsevier Science Ltd. All rights reserved.