Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 81, Issue -, Pages 61-68Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2013.04.005
Keywords
Polymer-matrix composites; Nanocomposites; Fibers; Mechanical properties; Melt-spinning
Categories
Funding
- Tianjin Municipal Science and Technology Development Plan [09JCZDJC22300]
- Ministry of Science and Technology, China [2010CB334711]
- State Key Laboratory of Hollow Fiber Membranes Materials and Process (Tianjin Polytechnic University)
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An in situ polymerization technique was used to develop localized polymers grafted onto the surface of dispersed pristine graphene sheets. A 4-substituted benzoic acid monomer was grafted to the surface of expanded graphene by Direct Friedel-Crafts acylation. The chains of poly(epsilon-caprolactam) (PA6) that were grafted on the functionalized graphene (FG) were prepared by in situ polymerization of epsilon-caprolactam in the presence of FG. Nanocomposite fibers with different loadings of FG were melt-spun with a piston spinning machine and a hot-roller drawing machine. FG is evenly distributed in the nanocomposite. A significant mechanical property increase of FG/PA6 nanocomposite is obtained at a low FG loading; e.g., a 65% improvement of tensile strength and a 290% improvement of Young's modulus compared to a pure PA6 fiber is achieved at a FG loading of 0.1 wt.%. The compatibility of FG and PA6 in the nanocomposite fiber improves the thermal stability of the polymer matrix. This functionalization method paves the way for the facile fabrication of graphene-based nanocomposite fibers without disrupting the primary structures of the graphene. (C) 2013 Elsevier Ltd. All rights reserved.
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