Effect of dispersion conditions on the thermo-mechanical and toughness properties of multi walled carbon nanotubes-reinforced epoxy
Effect of dispersion conditions on the thermo-mechanical and toughness properties of multi walled carbon nanotubes-reinforced epoxy
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DOI：
10.1016/j.compositesb.2012.01.070
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发表时间：
2012-09-01
影响因子：
13.1
通讯作者：
Paipetis, A. S.
中科院分区：
文献类型：
--
作者：
Gkikas, G.;Barkoula, N. -M.;Paipetis, A. S.
在这项工作中，多壁碳纳米管（MWCNTs）分散在聚合物基体已被用来提高所得的纳米复合材料的热机械和韧性性能。对未填充的、0.5和1重量%的聚碳酸酯进行动态力学分析（DMA）、拉伸试验和单边缺口3点弯曲试验。碳纳米管（CNT）填充的环氧树脂，以确定加载对上述性能的影响。分散条件的影响已被彻底调查方面的CNT含量，超声处理时间和总超声能量输入。CNT分散条件对改性体系的热机械性能和韧性性能都至关重要。对于0.5wt. %和1 wt.%，1h的超声处理持续时间对于储能模量和玻璃化转变温度（T-g）的提高是最有效的。CNT负载。储能模量和T-g在特定的超声处理条件下的显着增加与改善的分散和碳纳米管和环氧树脂基体之间的界面结合。超声能量是影响韧性的主要因素。超声处理2小时和50%的超声幅度获得最佳结果。有人建议，这种水平的超声处理允许适当分散的碳纳米管的环氧树脂基质，而不破坏碳纳米管的结构。(C)2012爱思唯尔有限公司保留所有权利。
In this work, multi wall carbon nanotubes (MWCNTs) dispersed in a polymer matrix have been used to enhance the thermo-mechanical and toughness properties of the resulting nanocomposites. Dynamic mechanical analysis (DMA), tensile tests and single edge notch 3-point bending tests were performed on unfilled, 0.5 and 1 wt.% carbon nanotube (CNT)-filled epoxy to identify the effect of loading on the aforementioned properties. The effect of the dispersion conditions has been thoroughly investigated with regard to the CNT content, the sonication time and the total sonication energy input. The CNT dispersion conditions were of key importance for both the thermo-mechanical and toughness properties of the modified systems. Sonication duration of 1 h was the most effective for the storage modulus and glass transition temperature (T-g) enhancement for both 0.5 and I wt.% CNT loadings. The significant increase of the storage modulus and T-g under specific sonication conditions was associated with the improved dispersion and interfacial bonding between the CNTs and the epoxy matrix. Sonication energy was the influencing parameter for the toughness properties. Best results were obtained for 2 h of sonication and 50% sonication amplitude. It was suggested that this level of sonication allowed appropriate dispersion of the CNTs to the epoxy matrices without destroying the CNT's structure. (C) 2012 Elsevier Ltd. All rights reserved.