PMID- 30124039
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20180917
LR  - 20180917
IS  - 1944-8252 (Electronic)
IS  - 1944-8244 (Linking)
VI  - 10
IP  - 36
DP  - 2018 Sep 12
TI  - Enhanced Electrical and Electromagnetic Interference Shielding Properties of 
      Polymer-Graphene Nanoplatelet Composites Fabricated via Supercritical-Fluid 
      Treatment and Physical Foaming.
PG  - 30752-30761
LID - 10.1021/acsami.8b10745 [doi]
AB  - Lightweight high-density polyethylene (HDPE)-graphene nanoplatelet (GnP) 
      composite foams were fabricated via a supercritical-fluid (SCF) treatment and 
      physical foaming in an injection-molding process. We demonstrated that the 
      introduction of a microcellular structure can substantially increase the 
      electrical conductivity and can decrease the percolation threshold of the 
      polymer-GnP composites. The nanocomposite foams had a significantly higher 
      electrical conductivity, a higher dielectric constant, a higher electromagnetic 
      interference (EMI) shielding effectiveness (SE), and a lower percolation 
      threshold compared to their regular injection-molded counterparts. The SCF 
      treatment and foaming exfoliated the GnPs in situ during the fabrication process. 
      This process also changed the GnP's flow-induced arrangement by reducing the melt 
      viscosity and cellular growth. Moreover, the generation of a cellular structure 
      rearranged the GnPs to be mainly perpendicular to the radial direction of the 
      bubble growth. This enhanced the GnP's interconnectivity and produced a unique 
      GnP arrangement around the cells. Therefore, the through-plane conductivity 
      increased up to a maximum of 9 orders of magnitude and the percolation threshold 
      decreased by up to 62%. The lightweight injection-molded nanocomposite foams of 
      9.8 vol % GnP exhibited a real permittivity of epsilon' = 106.4, which was superior to 
      that of their regular injection-molded (epsilon' = 6.2). A maximum K-band EMI SE of 
      31.6 dB was achieved in HDPE-19 vol % GnP composite foams, which was 45% higher 
      than that of the solid counterpart. In addition, the physical foaming reduced the 
      density of the HDPE-GnP foams by up to 26%. Therefore, the fabricated polymer-GnP 
      nanocomposite foams in this study pointed toward the further development of 
      lightweight and conductive polymer-GnP composites with tailored properties.
FAU - Hamidinejad, Mahdi
AU  - Hamidinejad M
AUID- ORCID: 0000-0003-3137-1990
FAU - Zhao, Biao
AU  - Zhao B
FAU - Zandieh, Azadeh
AU  - Zandieh A
FAU - Moghimian, Nima
AU  - Moghimian N
AD  - NanoXplore Inc. , 25 Boul. Montpellier , Saint-Laurent , Quebec H4N 2G3 , Canada.
FAU - Filleter, Tobin
AU  - Filleter T
AUID- ORCID: 0000-0003-2609-4773
FAU - Park, Chul B
AU  - Park CB
AUID- ORCID: 0000-0002-1702-1268
LA  - eng
PT  - Journal Article
DEP - 20180830
PL  - United States
TA  - ACS Appl Mater Interfaces
JT  - ACS applied materials & interfaces
JID - 101504991
OTO - NOTNLM
OT  - dielectric permittivity
OT  - electrical conductivity
OT  - electromagnetic interference shielding effectiveness
OT  - microcellular structure
OT  - physical foaming
OT  - polymer-graphene nanoplatelet composites
EDAT- 2018/08/21 06:00
MHDA- 2018/08/21 06:01
CRDT- 2018/08/21 06:00
PHST- 2018/08/21 06:00 [pubmed]
PHST- 2018/08/21 06:01 [medline]
PHST- 2018/08/21 06:00 [entrez]
AID - 10.1021/acsami.8b10745 [doi]
PST - ppublish
SO  - ACS Appl Mater Interfaces. 2018 Sep 12;10(36):30752-30761. doi: 
      10.1021/acsami.8b10745. Epub 2018 Aug 30.