期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 72, 期 2, 页码 218-224出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2011.11.005
关键词
Nano composites; carbon nanofiber; Electrical properties; Rheology
Carbon nanofiber (CNF)/poly(methyl methacrylate) (PMMA) nanocomposites were prepared via melt-compounding, solvent casting and in situ polymerization. Mechanical properties, rheological behavior and electrical resistivity were investigated in specimens with varying CNF loadings. The three processing techniques were compared. Improved properties were obtained in the solvent processed and in situ polymerized composites. The rheological and electrical percolation of these nanocomposites appeared in the same concentration set (between 1 and 5 wt%). No changes were found in melt-compounding, even by the addition of 10 wt% of CNFs. Electrical resistivity of the samples prepared by solvent casting was measured before and after pressing in the hot plate press. It is remarkable that in the non-pressed samples the CNFs formed an efficient 3-D conductive network, yielding composites with percolation thresholds even six orders of magnitude lower than after pressing, where this 3-D network was destroyed. (C) 2011 Elsevier Ltd. All rights reserved.
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