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Clay Intercalation and its Influence on the Morphology and Transport Properties of EVA/Clay Nanocomposites

Wilson, Runcy; George, Sajeev M.; Maria, Hanna J.; Plivelic, Tomás LU ; Kumar S, Anil and Thomas, Sabu (2012) In Journal of Physical Chemistry C 116(37). p.20002-20014
Abstract
Nanocomposite membranes based on poly-(ethylene-co-vinyl acetate) copolymer (18% vinyl acetate content)and two different organomodified clays have been prepared by

mechanical mixing using two roll mill method. The morphology of the nanocomposites was investigated using small angle X-ray scattering, scanning electron microscopy, and transmission electron microscopy. The mechanical and thermal studies were

also performed using universal testing machine and differential scanning calorimeter, respectively. Samples with low filler content showed excellent dispersion of layered silicates resulting in a partially exfoliated structure. The diffusion and transport of organic solvents through the membranes have been investigated in... (More)
Nanocomposite membranes based on poly-(ethylene-co-vinyl acetate) copolymer (18% vinyl acetate content)and two different organomodified clays have been prepared by

mechanical mixing using two roll mill method. The morphology of the nanocomposites was investigated using small angle X-ray scattering, scanning electron microscopy, and transmission electron microscopy. The mechanical and thermal studies were

also performed using universal testing machine and differential scanning calorimeter, respectively. Samples with low filler content showed excellent dispersion of layered silicates resulting in a partially exfoliated structure. The diffusion and transport of organic solvents through the membranes have been investigated in detail as a function of clay content, nature of solvent and clay, and temperature in the temperature range of 28−70 °C. The influence of free volume on the transport properties of the membranes was studied using positron annihilation lifetime spectroscopy. The solvent uptake was minimum for composites with 3 wt % of filler, and it get increased with increasing filler content, which is presumably due to aggregation of clay filler at higher loading. The transport phenomenon was found to follow an anomalous mode. Activation parameters were estimated, and the molar mass between cross-links was calculated. Finally, the experimental transport data were compared with theoretical predictions. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
EVA/clay nanocomposite, X-ray scattering, Diffusion, Free volume
in
Journal of Physical Chemistry C
volume
116
issue
37
pages
20002 - 20014
publisher
The American Chemical Society
external identifiers
  • wos:000308855600048
  • scopus:84866705026
ISSN
1932-7447
DOI
10.1021/jp302177y
language
English
LU publication?
yes
id
5519ecce-24c1-435c-b590-0b02fc46c258 (old id 3051340)
date added to LUP
2012-09-13 08:44:30
date last changed
2017-11-12 03:17:14
@article{5519ecce-24c1-435c-b590-0b02fc46c258,
  abstract     = {Nanocomposite membranes based on poly-(ethylene-co-vinyl acetate) copolymer (18% vinyl acetate content)and two different organomodified clays have been prepared by<br/><br>
mechanical mixing using two roll mill method. The morphology of the nanocomposites was investigated using small angle X-ray scattering, scanning electron microscopy, and transmission electron microscopy. The mechanical and thermal studies were<br/><br>
also performed using universal testing machine and differential scanning calorimeter, respectively. Samples with low filler content showed excellent dispersion of layered silicates resulting in a partially exfoliated structure. The diffusion and transport of organic solvents through the membranes have been investigated in detail as a function of clay content, nature of solvent and clay, and temperature in the temperature range of 28−70 °C. The influence of free volume on the transport properties of the membranes was studied using positron annihilation lifetime spectroscopy. The solvent uptake was minimum for composites with 3 wt % of filler, and it get increased with increasing filler content, which is presumably due to aggregation of clay filler at higher loading. The transport phenomenon was found to follow an anomalous mode. Activation parameters were estimated, and the molar mass between cross-links was calculated. Finally, the experimental transport data were compared with theoretical predictions.},
  author       = {Wilson, Runcy and George, Sajeev M. and Maria, Hanna J. and Plivelic, Tomás and Kumar S, Anil and Thomas, Sabu},
  issn         = {1932-7447},
  keyword      = {EVA/clay nanocomposite,X-ray scattering,Diffusion,Free volume},
  language     = {eng},
  number       = {37},
  pages        = {20002--20014},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry C},
  title        = {Clay Intercalation and its Influence on the Morphology and Transport Properties of EVA/Clay Nanocomposites},
  url          = {http://dx.doi.org/10.1021/jp302177y},
  volume       = {116},
  year         = {2012},
}