PMID- 29745647
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20180731
LR  - 20180731
IS  - 1944-8252 (Electronic)
IS  - 1944-8244 (Linking)
VI  - 10
IP  - 23
DP  - 2018 Jun 13
TI  - Ultralight Microcellular Polymer-Graphene Nanoplatelet Foams with Enhanced 
      Dielectric Performance.
PG  - 19987-19998
LID - 10.1021/acsami.8b03777 [doi]
AB  - Dielectric polymer nanocomposites with high dielectric constant (epsilon') and low 
      dielectric loss (tan delta) are extremely desirable in the electronics industry. 
      Percolative polymer-graphene nanoplatelet (GnP) composites have shown great 
      promise as dielectric materials for high-performance capacitors. Herein, an 
      industrially-viable technique for manufacturing a new class of ultralight polymer 
      composite foams using commercial GnPs with excellent dielectric performance is 
      presented. Using this method, the high-density polyethylene (HDPE)-GnPs 
      composites with a microcellular structure were fabricated by melt-mixing. This 
      was followed by supercritical fluid (SCF) treatment and physical foaming in an 
      extrusion process, which added an extra layer of design flexibility. The SCF 
      treatment effectively in situ exfoliated the GnPs in the polymer matrix. 
      Moreover, the generation of a microcellular structure produced numerous 
      parallel-plate nanocapacitors consisting of GnP pairs as electrodes with 
      insulating polymer as nanodielectrics. This significantly increased the real 
      permittivity and decreased the dielectric loss. The ultralight extruded HDPE-1.08 
      vol % GnP composite foams, with a 0.15 g.cm(-3) density, had an excellent 
      combination of dielectric properties (epsilon' = 77.5, tan delta = 0.003 at 1 x 10(5) Hz), 
      which were superior to their compression-molded counterparts (epsilon' = 19.9, tan delta = 
      0.15 and density of = 1.2 g.cm(-3)) and to those reported in the literature. This 
      dramatic improvement resulted from in situ GnP's exfoliation and dispersion, as 
      well as a unique GnP parallel-plate arrangement around the cells. Thus, this 
      facile method provides a scalable method to produce ultralight dielectric polymer 
      nanocomposites, with a microscopically tailored microstructure for use in 
      electronic devices.
FAU - Hamidinejad, Mahdi
AU  - Hamidinejad M
AUID- ORCID: 0000-0003-3137-1990
FAU - Zhao, Biao
AU  - Zhao B
FAU - Chu, Raymond K M
AU  - Chu RKM
FAU - Moghimian, Nima
AU  - Moghimian N
AD  - NanoXplore Inc. , 25 Boul. Montpellier , Saint-Laurent , Quebec H4N 2G3 , Canada.
FAU - Naguib, Hani E
AU  - Naguib HE
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 - 20180524
PL  - United States
TA  - ACS Appl Mater Interfaces
JT  - ACS applied materials & interfaces
JID - 101504991
OTO - NOTNLM
OT  - dielectric loss
OT  - dielectric permittivity
OT  - graphene nanoplatelets
OT  - microcellular structure
OT  - physical foaming
OT  - polymer nanocomposites
EDAT- 2018/05/11 06:00
MHDA- 2018/05/11 06:01
CRDT- 2018/05/11 06:00
PHST- 2018/05/11 06:00 [pubmed]
PHST- 2018/05/11 06:01 [medline]
PHST- 2018/05/11 06:00 [entrez]
AID - 10.1021/acsami.8b03777 [doi]
PST - ppublish
SO  - ACS Appl Mater Interfaces. 2018 Jun 13;10(23):19987-19998. doi: 
      10.1021/acsami.8b03777. Epub 2018 May 24.