• 文献标题:   Gas phase mineralized graphene as core/shell nanosheet supports for single-site olefin polymerization catalysts and in-situ formation of graphene/polyolefin nanocomposites
  • 文献类型:   Article
  • 作  者:   KIRSCHVINK F, STURZEL M, THOMANN Y, MULHAUPT R
  • 作者关键词:   graphene, silica, nanocomposite
  • 出版物名称:   POLYMER
  • ISSN:   0032-3861 EI 1873-2291
  • 通讯作者地址:   Univ Freiburg
  • 被引频次:   7
  • DOI:   10.1016/j.polymer.2014.07.017
  • 出版年:   2014

▎ 摘  要

A versatile gas phase mineralization process affords nanosheets containing a functionalized graphene (FG) core and a thin silica shell. The number of cycles, exposing FG to sequenced tetrachlorosilane and water vapors, controls the silica content and the silica shell thickness. The resulting high surface area core/shell nanosheets, containing 22 to 34 wt.-% silica, are used to immobilize single-site catalysts. During polymerization, the FG/silica nanosheets are uniformly dispersed in ultrahigh molecular weight polyethylene. This catalytic polymerization filling process, exploiting the encapsulation of graphene in a silica shell, is of interest to prepare electrically insulating carbon/polyolefin composite materials with high thermal conductivity useful in lightweight engineering. (C) 2014 Elsevier Ltd. All rights reserved.