Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 67, Issue 5, Pages 789-794Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2006.01.038
Keywords
semicrystalline polyimide; crystallization; carbon fillers; nucleating effect
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A new semicrystalline polyimide, based on 1,3-bis-(3,3',4,4'-dicarboxyphenoxy)benzene (R) and 4,4'-bis-(4-aminophenoxy)biphenyl (BAPB), was modified by carbon nanotubes and other carbon type fillers. This R-BAPB type polyimide, with a molecular weight M-w = 30,000 g/mol has a low melting temperature of 320 degrees C and a melt viscosity of about 1000 Pa s at 340 degrees C that gives the possibility to mix it with carbon particles by using solvent- and melt-based mixing. This study, based on calorimetric and rheological measurements, presents the nucleating effect on the polyimide of four types of carbon fillers, namely, carbon nanotubes, vapor grown carbon fibers and regular and graphitized carbon black. The strongest nucleating effect is observed for fillers with highly ordered graphitic structure, for which the highest degree of crystallinity of the polyimide matrix can be regenerated. (c) 2006 Elsevier Ltd. All rights reserved.
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