文献类型：期刊文献

英文题名：Dispersion of nano-carbon filled polyimide composites using self-degradated low molecular poly(amic acid) as impurity-free dispersant

作者：Wu, Guozhang[1];Tang, Yuchang[1];Weng, Renxiu[1]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Adv Polymer Mat, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2010

卷号：95

期号：9

起止页码：1449

外文期刊名：POLYMER DEGRADATION AND STABILITY

收录：;EI(收录号：20103313153370);WOS:【SCI-EXPANDED(收录号:WOS:000281369500002)】；

基金：This work was supported by grants from the National Natural Science Foundation of China (20974033).

语种：英文

外文关键词：Polyimide; Conducitve polymer composites; Dispersion; Carbon nanotube

摘要：Polyimide (PI)-based composite films incorporated with carbon black (CB), carbon nanotube (CNT) and carbon nanofiber (CNF), respectively, were prepared using low-molecular-weight poly(amic acid) (PAA), a precursor of PI, as an impurity-free dispersant. High-energy ball mill was employed not only to downsize the nano-carbon agglomerates, but also to cut off the PAA chains for in-situ stabilizing the dispersion. Effect of the ball milling time, procedure, and filler species on the filler dispersion was investigated by means of electrical resistivity reproducibility, morphology observation, and mechanical testing. Comparing with direct dispersion of the nano-carbon in PAA, the composite films fabricated by a two-step approach, that is dispersion from the in-situ degradated low-molecular-weight PAA stabilized nano-carbon slurry, presented a uniform electrical conductivity with a lower percolation concentration and excellent reproducibility in the percolation region. A significant improvement in the Young's modulus for the CNT loaded PI film was achieved, which was much more effective than those filled with CB or CNF. (C) 2010 Elsevier Ltd. All rights reserved.