Regenerated cellulose/multiwalled carbon nanotube composite films with efficient electric heating performance
Regenerated cellulose/multiwalled carbon nanotube composite films with efficient electric heating performance
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DOI：
10.1016/j.carbpol.2015.06.053
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发表时间：
2015-11-20
影响因子：
11.2
通讯作者：
Jeong, Young Gyu
中科院分区：
文献类型：
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作者：
Lee, Tae-Won;Jeong, Young Gyu
我们通过简单浇铸含有 0.2-10.0 wt% MWCNT 的纤维素/DMAc/LiCI 溶液，制造了用原始多壁碳纳米管 (MWCNT) 增强的再生纤维素基复合薄膜，并通过检查微观结构、热稳定性和电性能研究了它们作为电加热材料的应用。 TEM 图像显示原始 MWCNT 在再生纤维素基质中分散良好。研究发现，复合薄膜在高达 275 摄氏度的温度下仍具有热稳定性。随着 MWCNT 负载量的增加，再生纤维素/MWCNT 复合薄膜的电阻率从大约 10(9) Omega cm 显着降低至大约 10(1) Omega cm，特别是在 MWCNT 含量在 2.0 至 3.0 wt% 之间时。因此，MWCNT含量为5.0-10.0 wt%的复合薄膜具有接近10(2)-10(1) Omega cm的低电阻率，在恒定施加电压下的温度响应性、稳态最高温度和电能效率方面表现出优异的电加热性能。例如，具有10.0 wt% MWCNT的复合薄膜在20-80V下具有良好控制的稳态最高温度40-189℃，特征温度生长常数接近1s，电功率效率接近5.4mW/℃，在几个小时的重复实验下性能保持不变。 (C) 2015 Elsevier Ltd. 保留所有权利。
We have manufactured regenerated cellulose-based composite films reinforced with pristine multiwalled carbon nanotube (MWCNT) by a facile casting of cellulose/DMAc/LiCI solutions containing 0.2-10.0 wt% MWCNT and have investigated their application as electric heating materials by examining microstructure, thermal stability, and electrical properties. TEM images showed that the pristine MWCNT was dispersed well in the regenerated cellulose matrix. The composite films were found to be stable thermally up to similar to 275 degrees C. The electrical resistivity of the regenerated cellulose/MWCNT composite films decreased significantly from similar to 10(9) Omega cm to similar to 10(1) Omega cm with increasing the MWCNT loading, particularly at a certain MWCNT content between 2.0 and 3.0 wt%. Accordingly, the composite films with 5.0-10.0 wt% MWCNT contents, which possessed low electrical resistivity of similar to 10(2)-10(1) Omega cm, exhibited excellent electric heating performance in aspects of temperature responsiveness, steady-state maximum temperature, and electrical energy efficiency at constant applied voltages. For instance, the composite film with 10.0 wt% MWCNT had well-controlled steady-state maximum temperatures of 40-189 degrees C at 20-80V, characteristic temperature growth constant of similar to 1 s, and electric power efficiency of similar to 5.4 mW/degrees C, which performance remained unchanged under repeated experiments for several hours. (C) 2015 Elsevier Ltd. All rights reserved.