Anwer Muhammad A S, Wang Jintian, Guan Aaron Qi, Naguib Hani E
Department of Mechanical and Industrial Engineering, University of Toronto 5 King's College Street Toronto Ontario Canada.
BOCO Bio-Nanotechnologies Inc. 40 Pullman Court Toronto Canada.
RSC Adv. 2019 Apr 9;9(20):11063-11076. doi: 10.1039/c9ra00769e.
Chitin nano-whiskers (CNWs) are high performance nanomaterials that can be extracted from chitin, which is one of the most widely available bio-resources. Herein we investigate the effect of CNWs on the morphological, mechanical, dynamic mechanical and thermal properties of DGEBA epoxy. Optically transparent, bulk epoxy nano-composites with 0.25 wt%, 0.5 wt% and 0.75 wt% CNWs were evaluated in addition to neat epoxy. The composites were prepared based on a modified slurry compounding method. CNWs appear to be well dispersed within the epoxy matrix with increasing tendency for clustering as the CNW content is increased. The addition of 0.25 wt% CNWs to neat epoxy results in a decrease in the glass transition temperature and an increase in the tensile strength, modulus, damping and thermal degradation temperature. All the composites evaluated with CNWs showed distinct crack arrest events upon initiation of the first major crack growth during fracture toughness testing. Composites with 0.75 wt% CNWs showed the highest damping and an increase in the fracture toughness and resilience over neat epoxy.
几丁质纳米晶须（CNWs）是一种高性能纳米材料，可从几丁质中提取，几丁质是最丰富的生物资源之一。在此，我们研究了CNWs对二缩水甘油醚双酚A环氧树脂（DGEBA环氧树脂）的形态、力学、动态力学和热性能的影响。除了纯环氧树脂外，还评估了含有0.25 wt%、0.5 wt%和0.75 wt%CNWs的光学透明块状环氧纳米复合材料。复合材料是基于改进的浆料混合法制备的。随着CNW含量的增加，CNWs似乎能很好地分散在环氧基质中，但聚集趋势也在增加。向纯环氧树脂中添加0.25 wt%的CNWs会导致玻璃化转变温度降低，拉伸强度、模量、阻尼和热降解温度升高。在断裂韧性测试中，所有含CNWs的复合材料在首次出现主要裂纹扩展时均表现出明显的裂纹止裂现象。含0.75 wt%CNWs的复合材料表现出最高的阻尼，并且与纯环氧树脂相比，其断裂韧性和弹性有所提高。
