Nanocellulose enhanced interfaces in truly green unidirectional fibre reinforced composites
Nanocellulose enhanced interfaces in truly green unidirectional fibre reinforced composites
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DOI：
10.1163/156855407782106573
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发表时间：
2007-01-01
影响因子：
2.6
通讯作者：
Bismarck, Alexander
中科院分区：
文献类型：
--
作者：
Juntaro, Julasak;Pommet, Marion;Bismarck, Alexander
制造天然纤维增强聚合物的主要问题之一是固有极性植物纤维和非极性聚合物基质之间的粘合性差。我们已经开发出一种真正的绿色技术，通过将纳米级细菌纤维素附着到纤维表面来改性天然纤维（大麻和剑麻）表面，以改善纤维和聚合物之间的相互作用。然后将这些改性的天然纤维掺入可再生聚合物乙酸丁酸纤维素（CAB）和聚-L-乳酸（PLLA）中。制备了单向天然纤维增强复合材料，研究了表面改性对纤维和界面主导的复合材料性能的影响。平行以及垂直于细菌纤维素改性的天然纤维增强的复合材料的纤维的拉伸强度被发现显着增加，特别是在PLLA矩阵的情况下。在改性剑麻增强PLLA的情况下，平行强度增加了44%，离轴复合强度增加了68%。复合材料断裂表面的扫描电子显微镜观察证实了纤维和聚合物基体之间的相互作用得到了改善。
One of the main problems in fabricating natural fibre reinforced polymers is the poor adhesion between intrinsically polar plant fibres and non-polar polymer matrices. We have developed a truly green technique of modifying natural fibre (hemp and sisal) surfaces to improve the interaction between the fibres and polymers by attaching nano-scale bacterial cellulose to the fibre surfaces. These modified natural fibres were then incorporated into the renewable polymers cellulose acetate butyrate (CAB) and poly-L-lactic acid (PLLA). Unidirectional natural fibre reinforced composites were manufactured to investigate the impact of the surface modification on the fibre and interface dominated composite properties. Both the tensile strength parallel as well as perpendicular to the fibres of the composites reinforced by bacterial cellulose modified natural fibres were found to increase significantly, especially in the case of a PLLA matrix. In case of modified sisal reinforced PLLA the parallel strength increases by 44% and the off-axis composite strength by 68%. Scanning electron microscopy observations of the composite fracture surfaces confirm the improved interaction between the fibre and the polymer matrix.