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首页> 外文期刊>Journal of Applied Polymer Science >The fiber-matrix interface in Ioncell cellulose fiber composites and its implications for the mechanical performance
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The fiber-matrix interface in Ioncell cellulose fiber composites and its implications for the mechanical performance

机译：离子细胞纤维素纤维复合材料中的纤维 - 基质界面及其对机械性能的影响

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摘要

Fiber-reinforced composites based on natural fibers are promising alternatives for materials made of metal or synthetic polymers. However, the inherent inhomogeneity of natural fibers limits the quality of the respective composites. Man-made cellulose fibers (MMCFs) prepared from cellulose solutions via wet or dry-jet wet spinning processes can overcome these limitations. Herein, MMCFs are used to prepare single fiber epoxy composites and UD composites with 20, 30, 40, and 60 wt% fiber loads. The mechanical properties increase gradually with fiber loading. Young's modulus is improved three times while tensile strength doubles at a loading of 60 wt%. Raman spectroscopy is employed to follow conformational changes of the cellulose chains within the fibers upon mechanical deformation of the composites. The shift of the characteristic Raman band under strain indicates the deformation mechanisms in the fiber. Provided stress transfer occurs through the interface, it is a direct measure of the fiber-matrix interaction, which is investigated herein. The shift rate of the 1095 cm(-1) band decreases in single fiber composites compared to the neat fibers and continues to decrease as the fiber loading increased.
机译：基于天然纤维的纤维增强复合材料是金属或合成聚合物材料的有前途的替代品。然而，天然纤维固有的不均匀性限制了各自复合材料的质量。通过湿纺或干喷湿纺工艺从纤维素溶液制备的人造纤维素纤维（MMCFs）可以克服这些限制。在此，MMCFs用于制备单纤维环氧复合材料和UD复合材料，其纤维负载量分别为20、30、40和60 wt%。随着纤维含量的增加，复合材料的力学性能逐渐提高。杨氏模量提高了三倍，而拉伸强度在60 wt%的载荷下翻了一番。拉曼光谱用于跟踪复合材料机械变形时纤维内纤维素链的构象变化。应变下特征拉曼谱带的移动表明了光纤中的变形机制。如果应力传递通过界面发生，它是纤维-基体相互作用的直接量度，本文对此进行了研究。与纯纤维相比，单纤维复合材料中1095cm（-1）带的位移率降低，并随着纤维负载量的增加而继续降低。

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