Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 114, Issue -, Pages 64-71Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2015.04.011
Keywords
Carbon fibers; Polymer-matrix composites (PMCs); Interfacial adhesion; Interface; Impact behavior
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Funding
- National Natural Science Foundation of China [21174034]
- Heilongjiang Province Nature Science Foundation [ZD201311 E031403]
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We report on a new application of branched polyethyleneimine as a coupling agent to functionalize carbon fibers in conventional and supercritical methods. The microstructure and mechanical properties of carbon fibers before and after modification were investigated. Polyethyleneimine could increase the polarity, wettability and roughness of the carbon fiber surface, and supercritical methanol was also able to improve the reaction efficiency. The interfacial shear strength and impact toughness improved significantly when using the two methods, especially in supercritical methanol. Reinforcing and toughening mechanisms have also been discussed. Functionalization does not decrease fiber tensile strength. (C) 2015 Elsevier Ltd. All rights reserved.
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