Reduction in percolation threshold of injection molded high-density polyethylene/exfoliated graphene nanoplatelets composites by solid state ball milling and solid state shear pulverization
Reduction in percolation threshold of injection molded high-density polyethylene/exfoliated graphene nanoplatelets composites by solid state ball milling and solid state shear pulverization
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DOI：
10.1002/app.34891
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发表时间：
2012-04-05
影响因子：
3
通讯作者：
Drzal, Lawrence T.
中科院分区：
文献类型：
--
作者：
Jiang, Xian;Drzal, Lawrence T.
以往的工作表明，熔体挤出-注射成型制备的高密度聚乙烯(HDPE)/剥离石墨烯纳米片(GNP)纳米复合材料具有较高的渗流阈值，GNP负载量在10%~15%之间。为了降低注射成型HDPE/GNP纳米复合材料的渗流阈值，研究了两种特殊的加工方法：固态球磨(SSBM)和固态剪切粉碎(SSSP)。结果表明，采用这两种方法可以将HDPE/GNP纳米复合材料的渗流阈值降低到3%~5%。SSBM和SSSP能够产生较低渗流的机理是在聚合物表面覆盖GNP片层，这有助于在注射成型过程中形成导电网络。然而，研究发现，用这两种方法制备的HDPE/GNP纳米复合材料在高GNP负载下的力学性能较差。(C)2011年威利期刊公司J Appl Polym Sci，2012
Previous work showed that high density polyethylene (HDPE)/exfoliated graphene nanoplatelets (GNP) nanocomposites fabricated with melt extrusion followed by injection molding had a relatively high percolation threshold of between 10 and 15 vol % GNP loading. To lower the percolation threshold of injection molded HDPE/GNP nanocomposites, two special processing methods were investigated: solid state ball milling (SSBM) and solid state shear pulverization (SSSP). Results have confirmed that the percolation threshold of HDPE/GNP nanocomposites could be reduced to between 3 and 5 vol % GNP loading by these two approaches. The mechanism by which SSBM and SSSP are capable of producing lower percolation is to coat the polymer surface with GNP platelets which facilitates the formation of conductive networks during injection molding. However, it was found that HDPE/GNP nanocomposites obtained from these two techniques exhibited lower mechanical properties at high GNP loadings. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012