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首页> 美国卫生研究院文献>Molecules >Effect of Fiber Surface Modification on the Interfacial Adhesion and Thermo-Mechanical Performance of Unidirectional Epoxy-Based Composites Reinforced with Bamboo Fibers
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Effect of Fiber Surface Modification on the Interfacial Adhesion and Thermo-Mechanical Performance of Unidirectional Epoxy-Based Composites Reinforced with Bamboo Fibers

机译：纤维表面改性对竹纤维增强单向环氧树脂基复合材料界面粘合和热机械性能的影响

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摘要

In this work, bamboo fibers are chemically modified with NaOH solution of 1, 4, and 7 wt% concentrations at room temperature, respectively, and subsequently the untreated and treated fibers are prepared with epoxy resin for unidirectional composites by hot pressing molding technique. Tensile and micro-bond tests are conducted on the composite specimens to obtain mechanical properties, such as tensile strength and modulus, elongation at break, and interfacial strength. Besides, scanning electron microscopy (SEM) is employed to perform morphological observations for constituent damages. In addition, the influence of alkali concentration on the thermal performance of epoxy-based composites is examined by using differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis. It is found that composite tensile strength reaches the maximum when the alkali concentration is 4%, increased by 45.24% compared with untreated composites. The composite elongation at break increases on increasing the concentration. Inversely, the composite modulus decreases as the concentration increases. Besides, the results demonstrate that the chemical treatment on the fiber surface could improve interface adhesion, as observed from its topography by SEM. Micro-bond test reveals that there is maximum interfacial shear strength when the alkali concentration is 4%, which increases by 100.30% in comparison with the untreated samples. In case of thermal properties, the DSC analysis indicates that the glass transition temperature is maximized at 4% alkali concentration, which is increased by 12.95%, compared to those from unmodified fibers. In addition, TG results show that the 4% concentration also facilitates thermal stability improvement, indicative of superior interfacial bonding.
机译：在这项工作中，竹纤维分别在室温下分别用浓度为1、4和7 wt％的NaOH溶液进行化学改性，然后通过热压成型技术用单向复合材料用环氧树脂制备未经处理和处理过的纤维。对复合材料试样进行拉伸和微粘结试验，以获得机械性能，例如拉伸强度和模量，断裂伸长率和界面强度。此外，采用扫描电子显微镜（SEM）进行成分破坏的形态观察。此外，使用差示扫描量热法（DSC）和热重分析（TG）分析了碱浓度对环氧基复合材料热性能的影响。发现当碱浓度为4％时，复合材料的抗张强度达到最大，与未处理的复合材料相比增加了45.24％。复合物的断裂伸长率随着浓度的增加而增加。相反，复合模量随浓度增加而降低。此外，结果表明，对纤维表面进行化学处理可以改善界面附着力，从SEM的形貌可以看出。微键测试表明，当碱浓度为4％时，界面剪切强度最大，与未处理样品相比，界面剪切强度提高了100.30％。在热性能的情况下，DSC分析表明，与未改性纤维相比，在4％的碱浓度下，玻璃化转变温度最高，增加了12.95％。另外，TG结果表明4％的浓度也促进了热稳定性的改善，表明优异的界面结合。

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