Electrical and rheological properties of polycarbonate/multiwalled carbon nanotube nanocomposites
Electrical and rheological properties of polycarbonate/multiwalled carbon nanotube nanocomposites
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DOI：
10.1016/j.colsurfa.2007.04.104
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发表时间：
2008-02-01
影响因子：
5.2
通讯作者：
Lee, Dai Soo
中科院分区：
文献类型：
--
作者：
Jin, Sung Hun;Choi, Deok Kyu;Lee, Dai Soo
采用沉淀法制备了聚碳酸酯（PC）/多壁碳纳米管（MWCNT）纳米复合材料，并对其表面改性和流变性能进行了研究。的纳米复合材料显示出阈值降低，在其表面亲水性随着MWCNT含量的增加，在相对较低的浓度为0.91体积%。表面亲水性阈值降低所需的低浓度归因于原始的MWCNT，没有对导电填料不利的改性。随着剪切应力的变化，观察到稳态剪切粘度的屈服行为。纳米复合材料的粘度低于纯PC。据推测，降低的粘度已导致PC/MWCNT纳米复合材料中的PC分子和自由体积的迁移率的增加，这是由纳米复合材料的玻璃化转变温度相比，纯PC降低支持。(C)2007 Elsevier B. V.保留所有权利。
Nanocomposites of polycarbonate (PC) and multiwalled carbon nanotube (MWCNT) were prepared using a precipitation method, and the surface resistivities and theological properties of the nanocomposites were investigated. The nanocomposites showed a threshold decrease in their surface resistivities with increasing MWCNT content at a relatively low concentration of 0.91 vol.%. The low concentration required for the threshold decrease in the surface resistivities was attributed to the pristine MWCNT, without modifications unfavorable for the electrically conductive fillers. Yield behavior was observed with the change in the steady shear viscosities with shear stresses. The viscosities of the nanocomposites were lower than that of the neat PC. It is postulated that the decreased viscosity had resulted from the increase in the mobilities of the PC molecules and free volumes in the PC/MWCNT nanocomposites, which were supported by the decreased glass transition temperatures of the nanocomposites compared to the neat PC. (C) 2007 Elsevier B.V. All rights reserved.