• 文献标题:   Development of polymer composites using modified, high-structural integrity graphene platelets
  • 文献类型:   Article
  • 作  者:   MA J, MENG QS, ZAMAN I, ZHU SM, MICHELMORE A, KAWASHIMA N, WANG CH, KUAN HC
  • 作者关键词:   functional composite, nano composite, nano particle, fracture toughnes, interface, graphene nominated
  • 出版物名称:   COMPOSITES SCIENCE TECHNOLOGY
  • ISSN:   0266-3538 EI 1879-1050
  • 通讯作者地址:   Far East Univ
  • 被引频次:   63
  • DOI:   10.1016/j.compscitech.2013.11.017
  • 出版年:   2014

▎ 摘  要

Previous studies on polymer/graphene composites have mainly utilized either reduced graphene oxide or graphite nanoplatelets of over 10 nm in thickness. In this study we covalently modified 3-nm thick graphene platelets (GnPs) by the reaction between the GnPs' epoxide groups and the end-amine groups of a commercial long-chain surfactant (M-w = 2000), compounded the modified GnPs (m-GnPs) with a model polymer epoxy, and investigated the structure and properties of both m-GnPs and their epoxy composites. A low Raman I-D/I-G ratio of 0.13 was found for m-GnPs corresponding to high structural integrity. A percolation threshold of electrical conductivity was observed at 0.32 vol% m-GnPs, and the 0.98 vol% m-GnPs improved the Young's modulus, fracture energy release rate and glass transition temperature of epoxy by 14%, 387% and 13%, respectively. These significantly improved properties are credited to: (i) the low Raman I-D/I-G ratio of GnPs, maximizing the structural integrity and thus conductivity, stiffness and strength inherited from its sister graphene, (ii) the low thickness of GnPs, minimizing the damaging effect of the poor through-plane mechanical properties and electrical conductivity of graphene, (iii) the high-molecular weight surfactant, leading to uniformly dispersed GnPs in the matrix, and (iv) a covalently bonded interface between m-GnPs and matrix, more effectively transferring load/electron across interface. (C) 2013 Elsevier Ltd. All rights reserved.