Natural fibre-reinforced polymer composites are increasingly replacing commercial composite materials. The limitations of conventional composites materials are overcome by green composites, which are easily available, more eco-friendly and less toxic. In the current scenario, green composites are emerging in the field of material science that involves improving their physical, mechanical and thermal properties. The poor interfacial adhesion and surface incompatibility between natural fibre and biodegradable polymers lead to reduced physico-mechanical properties. In order to overcome this issue, physical and chemical modification methodologies of the natural fibre and polymer matrix are employed, among which the addition of coupling agents has a critical contribution. This paper compiles several recent research works in the utilization of coupling agents such as silane, maleic anhydride, isocyanate, triazine, etc., with the various combinations of natural fibres and polymers. In addition to this, the extents of influence of coupling agents on the characteristics of the natural fibre reinforced composite materials are also reported. This gives an overview for the future researchers to identify the gap in the field of green composite materials and novel coupling agents for different natural fibre/polymer matrix combination.

中文翻译：

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偶联剂对改变天然纤维掺入聚合物增强效率的影响——综述

天然纤维增强聚合物复合材料正越来越多地取代商业复合材料。绿色复合材料克服了传统复合材料的局限性，绿色复合材料易于获得、更环保且毒性更小。在目前的情况下，绿色复合材料正在材料科学领域出现，涉及改善其物理、机械和热性能。天然纤维和可生物降解聚合物之间较差的界面附着力和表面不相容性导致物理机械性能降低。为了克服这个问题，采用了天然纤维和聚合物基体的物理和化学改性方法，其中偶联剂的加入起到了关键作用。本文汇集了近年来在硅烷、马来酸酐、异氰酸酯、三嗪等偶联剂与天然纤维和聚合物的各种组合的利用方面的几项研究工作。除此之外，还报道了偶联剂对天然纤维增强复合材料特性的影响程度。这为未来的研究人员提供了一个概述，以确定绿色复合材料和用于不同天然纤维/聚合物基体组合的新型偶联剂领域的差距。