Biocomposites Based on Poly(Lactic Acid) Matrix and Reinforced with Lignocellulosic Fibers: The Effect of Fiber Type and Matrix Modification

ABSTRACT

In composite materials, two or more different components are combined to produce a new material with different characteristics from the individual components. In recent years, due to environmental concerns, the development of biocomposites based on natural fibers has attracted great interest of researchers. The mechanical properties of biocomposites are dependent, among other parameters, on matrix properties, fiber properties as well as fiber/matrix adhesion. There are different approaches to improve fiber/matrix adhesion, such as, the use of fiber surface treatments and the use of matrix modifiers, i.e.,: coupling agents. In this work, poly(lactic acid) matrix composites reinforced with two different lignocellulosic fibers (sisal and flax) were prepared and the mechanical properties of both types of composites were compared. On the other hand, poly(lactic acid) polymer was modified with maleic anhydride in the presence of dicumyl peroxide. The mechanical properties of PLA/lignocellulosic fiber composites modified with maleic anhydride-modified poly(lactic acid) were also studied.

摘要

在复合材料中，两个或多个不同的组分被组合起来，以产生与单个组分具有不同特性的新材料. 近年来，由于环境问题，基于天然纤维的生物复合材料的开发引起了研究者的极大兴趣. 除其他参数外，生物复合材料的力学性能取决于基质性能、纤维性能以及纤维/基质的粘附性. 提高纤维/基体结合力的方法有多种，如采用纤维表面处理和基体改性剂偶联剂. 本文采用两种不同的木质纤维素纤维（剑麻纤维和亚麻纤维）制备了聚乳酸基复合材料，并对两种复合材料的力学性能进行了比较. 另一方面，在过氧化二异丙苯的存在下，用马来酸酐改性聚乳酸聚合物. 研究了马来酸酐改性聚乳酸对聚乳酸/木质纤维素纤维复合材料力学性能的影响.

KEYWORDS:

• Poly(lactic acid)
• flax
• sisal
• composite
• mechanical properties
• coupling agent

关键词:

• 聚乳酸
• 亚麻
• 剑麻
• 混合成的
• 力学性能
• 偶联剂

Acknowledgments

Authors are grateful for the financial support from the Basque Country Government in the frame of Elkartek “Provimat” KK-2018/00046 and PIBA19-0044 projects and from the University of the Basque Country in the frame of GIU 18/216 project. The authors also thank for technical and human support provided by SGIker of UPV/EHU and European funding (ERDF and ESF).

Additional information

Funding

This work was supported by the Euskal Herriko Unibertsitatea [GIU 18/216]; Eusko Jaurlaritza [KK-2018/00046 and PIBA19-0044].