Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 43, Issue 9, Pages 1561-1568Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2012.04.011
Keywords
Polymer-matrix composites (PMCs); Creep; Electron microscopy; Extrusion
Funding
- National Nature Science Foundation of China [51073044]
- Ministry of Science and Technology of China [2011DFR50200]
- Chinese Academy of Science [KJCX2-YW-M20]
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Materials subject to cyclic stress can succumb to fatigue, causing failure at stress levels much lower than those in static loading cases. Herein we discussed the viscoelastic behaviors of polystyrene/multi-walled carbon nanotube (MWCNT) composites during short-term creep and recovery under tensile cyclic loading. Both unmodified and ozone oxidized MWCNTs were applied. It was found in general that the creep strain of thermoplastics dropped with decreasing temperature and stress, and with increasing content of carbon nanotubes. Moreover, with the increased cycle number, the creep strain reduced remarkably. This trend would be even more obvious at high levels of stress and temperature. Further mechanism analysis indicated the network-like structure formed by the molecule chains and nanotubes caused the reduction of the creep strain, the increasing of recovery ratio and the restriction on the mobility of amorphous molecule chains. (c) 2012 Elsevier Ltd. All rights reserved.
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