A comparison of the mechanical characteristics of kenaf and lyocell fibre reinforced poly(lactic acid) (PLA) and poly(3-hydroxybutyrate) (PHB) composites
A comparison of the mechanical characteristics of kenaf and lyocell fibre reinforced poly(lactic acid) (PLA) and poly(3-hydroxybutyrate) (PHB) composites
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DOI：
10.1016/j.compositesa.2011.09.007
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发表时间：
2011-12-01
影响因子：
8.7
通讯作者：
Muessig, Joerg
中科院分区：
文献类型：
--
作者：
Graupner, Nina;Muessig, Joerg
纤维素纤维增强聚乳酸（PLA）和聚（3-羟基丁酸酯）（PHB）复合材料因其生物降解性和力学性能而受到越来越多的关注。使用不同的矩阵导致可变的复合特性。本研究提供了压缩成型的30质量%的莱赛尔纤维和40质量%的红麻纤维增强的PLA和PHB的机械特性的比较。拉伸试验结果表明，质量分数为30%的Lyocell/PLA复合材料的拉伸强度和弯曲强度最高，分别为89和148 N/mm（2）。对于30质量%的莱赛尔纤维/PLA还测量到最高杨氏模量为9.3GPa，并且对于40质量%的洋麻/PHB测量到最高弯曲模量为7.1GPa。到目前为止，lyocell/PHB的冲击强度最高，为70 kJ/m2，其次是lyocell/PLA，为52 kJ/m2。对海岸D硬度的研究表明，PLA基质的硬度值较高，为81.5。PHB的硬度达到67.5。通过添加纤维作为增强材料，莱赛尔/PLA的海岸D硬度增加到83.6，洋麻/PHB的硬度增加到73.1。密度测量表明，与理论密度相比，具有较高纤维负载的复合材料（洋麻/PLA和洋麻/PHB）的密度较低。这说明复合材料中含有较高比例的空气，这可能对复合材料的机械特性产生负面影响。(C)2011爱思唯尔有限公司版权所有。
Cellulose fibre-reinforced poly(lactic acid) (PLA) and poly(3-hydroxybutyrate) (PHB) composites have become increasingly interesting with regard to their biodegradability and mechanical characteristics. The use of different matrices leads to variable composite characteristics. This study provides a comparison of the mechanical characteristics of compression-moulded 30 mass% lyocell and 40 mass% kenaf fibre-reinforced PLA and PHB. The results of the tensile tests showed that 30 mass% lyocell/PLA composites reached the highest tensile and bending strength with 89 and 148 N/mm(2), respectively. The highest Young's modulus was also measured for 30 mass% lyocell/PLA with 9.3 GPa, and the highest flexural modulus was measured for 40 mass% kenaf/PHB with 7.1 GPa. By far, the best impact strength was determined for lyocell/PHB with 70 kJ/m(2), followed by lyocell/PLA with 52 kJ/m(2). The investigation of the Shore D hardness resulted in a higher value for the PLA matrix with 81.5. PHB achieved a hardness of 67.5. By adding fibres as reinforcement, the Shore D hardness increased up to 83.6 for lyocell/PLA and 73.1 for kenaf/PHB. Density measurements showed lower densities for the composites with higher fibre loads (kenaf/PLA and kenaf/PHB) in comparison to the theoretical density. This speaks for a higher proportion of air inclusion in the composites which could negatively affect the mechanical composite characteristics. (C) 2011 Elsevier Ltd. All rights reserved.