期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 81, 期 -, 页码 61-68出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2013.04.005
关键词
Polymer-matrix composites; Nanocomposites; Fibers; Mechanical properties; Melt-spinning
资金
- 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)
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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