Effect of processing variables on the mechanical properties of sisal-fiber-reinforced polypropylene composites
Effect of processing variables on the mechanical properties of sisal-fiber-reinforced polypropylene composites
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DOI：
10.1016/s0266-3538(99)00024-x
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发表时间：
1999-01-01
影响因子：
9.1
通讯作者：
Thomas, S
中科院分区：
文献类型：
--
作者：
Joseph, PV;Joseph, K;Thomas, S
采用熔融混炼法和溶液混炼法制备了短剑麻纤维增强聚丙烯复合材料。在熔体混合技术。通过改变搅拌时间、转速和腔室温度对搅拌参数进行优化。搅拌时间为10 min，转速为50 rpm，搅拌温度为170℃为最佳搅拌条件。比较了熔融混合和溶液混合复合材料的拉伸性能。在最佳混合条件下，熔融混合复合材料的拉伸性能优于溶液混合复合材料。研究了纤维长度、纤维载荷和纤维取向对PP/剑麻复合材料力学性能的影响。从纤维长度分布曲线和光学显微照片分析了熔融混合过程中纤维的断裂和损伤。研究了化学处理对剑麻/PP复合材料拉伸性能的影响。采用氢氧化钠、马来酸酐、聚氨酯衍生物PPG和高锰酸盐等化学物质进行处理，以改善纤维/聚合物界面的结合。结果表明，所有处理均显著提高了复合材料的拉伸性能，但程度不同。1999爱思唯尔科学有限公司版权所有。
Composite consisting of polypropylene reinforced with short sisal fibers were prepared by melt-mixing and solution-mixing methods. In the melt-mixing technique. mixing parameters were optimised by varying the mixing time, rotor speed and chamber temperature. A mixing time of 10 min, rotor speed of 50 rpm and a mixing temperature of 170 degrees C were found to be the optimum mixing conditions. Tensile properties of melt-mixed and solution-mixed composites were compared. Under optimum mixing conditions melt-mixed composites showed better tensile properties than those of solution-mixed composites. The influence of fiber length, fiber loading and fiber orientation on the mechanical properties of PP/sisal composites has been evaluated. The fiber breakage and damage during melt-mixing were analysed from fiber-length distribution curves and optical photomicrographs. The effect of chemical treatment on the tensile properties of sisal/PP composites was investigated. Treatments with chemicals such as sodium hydroxide, maleic anhydride, urethane derivative of PPG, and permanganate were carried out to improve the bonding at the fiber/polymer interface. It hits been observed that all the treatments enhanced the tensile properties of the composites considerably, but to varying degrees. (C) 1999 Elsevier Science Ltd. All rights reserved.