Abstract In the current era, sustainability and biodegradability are two necessary terms, which are related to the composite materials. Due to environmental sustainability use of the natural fibres as reinforcement is increased in composites for various applications as compared to glass fibre. In this research work, jute fibres are used as reinforcement due to the low cost and Polypropylene (PP) as matrix due to its ease of availability. The novelty of the work is to study the effect of plying of PP sheets on the tensile strength and thermal behavior of PP-Jute laminate composites by using simple hot press machine. Effect of polymer degradation due to repeated thermal processing on the mechanical performance of composite is also investigated. In this work the effect of the fibre cut length (3 cm, 6 cm and 9 cm), number of plies (1, 2 and 4) and fibre loading (0%, 5% and 10%) is studied. The structural, thermal and mechanical properties of the composites are investigated using X-Ray diffraction, tensile test, DSC and dynamic mechanical analysis. It is observed that the mechanical properties of composite improved up to 2 plies and deteriorate thereafter. Best results are obtained for 2-plied composites at all levels of fibre loading. Crystallinity percentage is reduced while crystallite size is increased in case of composites as compared to neat PP sheet. Jute-PP composites could be used for various applications in automobile industries, building components such as partitioning panels and similar applications.

中文翻译：

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黄麻纤维增强聚丙烯层压复合材料的拉伸强度和热性能

摘要 在当今时代，可持续性和生物降解性是与复合材料相关的两个必要术语。由于环境可持续性，与玻璃纤维相比，在各种应用的复合材料中增加了天然纤维作为增强材料的使用。在这项研究工作中，黄麻纤维由于成本低而被用作增强材料，而聚丙烯 (PP) 因其易于获得而被用作基质。这项工作的新颖之处在于通过使用简单的热压机研究了 PP 片材的合股对 PP-黄麻层压复合材料的拉伸强度和热行为的影响。还研究了由于重复热处理引起的聚合物降解对复合材料机械性能的影响。在这项工作中，纤维切割长度（3 厘米、6 厘米和 9 厘米）、层数（1、2 和 4) 和纤维负载 (0%、5% 和 10%) 进行了研究。使用X射线衍射、拉伸试验、DSC和动态力学分析研究了复合材料的结构、热和机械性能。据观察，复合材料的机械性能提高到 2 层，然后恶化。在所有纤维负载水平下，2 层复合材料都获得了最佳结果。与纯 PP 片材相比，复合材料的结晶度百分比降低，而微晶尺寸增加。黄麻-PP 复合材料可用于汽车工业、建筑部件（如隔板）和类似应用中的各种应用。DSC 和动态力学分析。据观察，复合材料的机械性能提高到 2 层，然后恶化。在所有纤维负载水平下，2 层复合材料都获得了最佳结果。与纯 PP 片材相比，复合材料的结晶度百分比降低，而微晶尺寸增加。黄麻-PP 复合材料可用于汽车工业、建筑部件（如隔板）和类似应用中的各种应用。DSC 和动态力学分析。据观察，复合材料的机械性能提高到 2 层，然后恶化。在所有纤维负载水平下，2 层复合材料都获得了最佳结果。与纯 PP 片材相比，复合材料的结晶度百分比降低，而微晶尺寸增加。黄麻-PP 复合材料可用于汽车工业、建筑部件（如隔板）和类似应用中的各种应用。