PMID- 19924319
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20100122
LR  - 20091120
IS  - 1463-9084 (Electronic)
IS  - 1463-9076 (Linking)
VI  - 11
IP  - 46
DP  - 2009 Dec 14
TI  - Physical properties of nanocomposites prepared by in situ polymerization of 
      high-density polyethylene on multiwalled carbon nanotubes.
PG  - 10851-9
LID - 10.1039/b913527h [doi]
AB  - In situ metallocence polymerization was used to prepare nanocomposites of 
      multiwalled carbon nanotubes (MWCNT) and high density polyethylene (HDPE). This 
      polymerization method consists of attaching a metallocene catalyst complex onto 
      the surface of MWCNT followed by surface-initiated polymerization to generate 
      polymer brushes on the surface. All the procedures of polymerization made 
      progress with one-pot process. The morphological observation of nanocomposites 
      using scanning electron microscopy (SEM) and transmission electron microscopy 
      (TEM) showed that the nanotubes are uniformly dispersed throughout HDPE matrix. 
      Physical properties of thermal and electrical conductivities and rheological 
      response have been characterized. Since the carbon nanotubes are wrapped by PE 
      molecules, the large interface provided by MWCNT's lead to strong phonon boundary 
      scattering. Thus, the enhancement of thermal conductivity by the inclusion of 
      nanotubes was quite restrictive. On the other hand, electrical conductivity and 
      rheological properties show the property transition at the critical concentration 
      of carbon nanotubes (percolation threshold). The DC conductivity increased with 
      increasing weight fraction of MWCNT from 1.0 x 10(-13) S cm(-1) (neat HDPE) to 
      1.3 x 10(-2) S cm(-1) (HDPE/7.3 wt% of MWCNT) at room temperature and the 
      electrical percolation threshold was ca. 7.3 wt%. The percolation threshold 
      concentration of MWCNT for the rheological properties was ca. 8.7 wt%, similar to 
      that of the electrical conductivity. Difference in the percolation behaviors 
      between the MWCNT mixed nanocomposites and the PE-coated MWCNT nanocomposites is 
      discussed in terms of the dispersion and the tube-tube distance of MWCNT.
FAU - Kim, Jihun
AU  - Kim J
AD  - Intellectual Textile Research Center and School of Materials Science and 
      Engineering, College of Engineering, Seoul National University, Shillimdong 56-1, 
      Kwanakgu, Seoul, 151-744, Korea.
FAU - Hong, Soon Man
AU  - Hong SM
FAU - Kwak, Soonjong
AU  - Kwak S
FAU - Seo, Yongsok
AU  - Seo Y
LA  - eng
PT  - Journal Article
DEP - 20090923
PL  - England
TA  - Phys Chem Chem Phys
JT  - Physical chemistry chemical physics : PCCP
JID - 100888160
EDAT- 2009/11/20 06:00
MHDA- 2009/11/20 06:01
CRDT- 2009/11/20 06:00
PHST- 2009/11/20 06:00 [entrez]
PHST- 2009/11/20 06:00 [pubmed]
PHST- 2009/11/20 06:01 [medline]
AID - 10.1039/b913527h [doi]
PST - ppublish
SO  - Phys Chem Chem Phys. 2009 Dec 14;11(46):10851-9. doi: 10.1039/b913527h. Epub 2009 
      Sep 23.