A novel processing technique for thermoplastic manufacturing of unidirectional composites reinforced with jute yarns
A novel processing technique for thermoplastic manufacturing of unidirectional composites reinforced with jute yarns
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DOI：
10.1016/j.compositesa.2005.12.030
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发表时间：
2006-01-01
影响因子：
8.7
通讯作者：
Hamada, H.
中科院分区：
文献类型：
--
作者：
Khondker, O. A.;Ishiaku, U. S.;Hamada, H.
本文主要研究了用黄麻纱(未处理和处理)制备长纤维增强单向热塑性复合材料的工艺。采用管状编织技术，以黄麻纱为直插轴向增强纤维，在增强黄麻纱周围编织聚合物基纤维，生产出一种名为“微细编织纱”(MBY)的中间材料。然后，将MicroBraid纱线平行缠绕到金属框架上，并进行压缩模压，以制备单向复合材料试件。在本研究中，使用了两种类型的聚合物材料(可生物降解的聚乳酸和不可生物降解的均聚聚丙烯)作为基质纤维。通过拉伸试验和三点弯曲试验评价了复合材料的基本静态力学性能。对试验结果进行了分析，研究了成型温度和压力对力学行为和界面行为的影响。结果表明，对于黄麻纤维/聚乳酸单向复合材料，在175℃、2.7 Mpa的压力下成型更适合获得最佳的性能。由于适当的基质熔融改善了润湿性，有利于彻底浸渍，从而促进了纤维/基质界面的相互作用，从而有效地将应力从基质传递到纤维，并改善了黄麻纱的增强效果。对于黄麻纤维含量仅为20%的黄麻/PP单向复合材料，与纯PP相比，黄麻纤维含量仅为20%的样品具有显著的拉伸和弯曲性能改善。力学性能的提高广泛地与各种因素有关，如树脂熔体在纤维束中的润湿性、界面粘附性、基质纤维的取向和均匀分布以及管状编织过程中纤维的磨损和衰减。(C)2006爱思唯尔有限公司。保留所有权利。
This paper primarily investigates the fabrication process of long-fibre reinforced unidirectional thermoplastic composites made using jute yarns (both untreated and treated). Tubular braiding technique was used to produce an intermediate material called "microbraid yarn" (MBY) with jute yarn as the straightly inserted axial reinforcement fibre and polymer matrix fibre being braided around the reinforcing jute yarns. Microbraid yarns were then wound in a parallel configuration onto a metallic frame and compression molded to fabricate unidirectional composite specimens. In this study, two types of polymeric materials (biodegradable poly(lactic) acid and non-biodegradable homo -polypropylene) were used as matrix fibres. Basic static mechanical properties were evaluated from tensile and 3 point bending tests. Test results were analyzed to investigate the effects of molding temperature and pressure on the mechanical and interfacial behaviour. For the unidirectional jute fibre/poly(lactic) acid (PLA) composites, the results indicated that the molding condition at 175 degrees C and 2.7 MPa pressure was more suitable to obtain optimized properties. Improved wettability due to proper matrix fusion facilitated thorough impregnation, which contributed positively to the fibre/matrix interfacial interactions leading to effective stress transfer from matrix to fibre and improved reinforcing effects of jute yarns. For the jute/PP unidirectional composites, specimens with only 20% of jute fibre content have shown remarkable improvement in tensile and bending properties when compared to those of the virgin PP specimens. The improvements in the mechanical properties are broadly related to various factors, such as the wettability of resin melts into fibre bundles, interfacial adhesion, orientation and uniform distribution of matrix-fibres and the lack of fibre attrition and attenuation during tubular braiding process. (c) 2006 Elsevier Ltd. All rights reserved.