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Preparation and Characterization of EVA/Clay Nanocomposites with Improved Barrier Performance

Wilson, Runcy; Plivelic, Tomás LU ; Aprem, Abi Santhosh; Ranganathaiagh, C.; Kumar, S Anil and Thomas, Sabu (2012) In Journal of Applied Polymer Science 123(Online 30 September 2011). p.3806-3818
Abstract
Poly (ethylene-co-vinyl acetate) (EVA)/clay nanocomposites containing two different organoclays with different clay loadings were prepared. The transport of gases (oxygen and nitrogen) through the composite membranes

was investigated and the results were compared. These studies revealed that the incorporation of nanoclays in the polymer increased the efficiency of the membranes toward barrier properties. It was also found that the barrier

properties of the membranes decreased with clay loadings. This is mainly due to the aggregation of clay at higher loadings. The morphology of the nanocomposites was studied by scanning electron microscopy, transmission

electron microscopy and X-ray scattering. Small angle X-ray... (More)
Poly (ethylene-co-vinyl acetate) (EVA)/clay nanocomposites containing two different organoclays with different clay loadings were prepared. The transport of gases (oxygen and nitrogen) through the composite membranes

was investigated and the results were compared. These studies revealed that the incorporation of nanoclays in the polymer increased the efficiency of the membranes toward barrier properties. It was also found that the barrier

properties of the membranes decreased with clay loadings. This is mainly due to the aggregation of clay at higher loadings. The morphology of the nanocomposites was studied by scanning electron microscopy, transmission

electron microscopy and X-ray scattering. Small angle X-ray scattering results showed significant intercalation of the polymer chains between the organo-modified silicate layers in all cases. Better dispersed silicate layer stacking and more homogeneous membranes were obtained for Cloisite 25A based nanocomposites compared with Cloisite 20A samples. Microscopic observations (SEM and TEM) were coherent with those results. The dispersion of clay platelets seemed to be maximized for 3 wt % of clay and agglomeration increased with higher clay loading. Wide angle X-ray scattering results showed no significant modifications in the crystalline structure of the EVA matrix because of the presence of the clays. The effect of free volume on the transport behavior was studied using positron annihilation spectroscopy. The permeability results have been correlated with various permeation models. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
EVA/organoclay nanocomposites, X-ray scattering (SAXS and WAXS), TEM, free volume, gas transport
in
Journal of Applied Polymer Science
volume
123
issue
Online 30 September 2011
pages
3806 - 3818
publisher
John Wiley & Sons
external identifiers
  • wos:000298086500071
  • scopus:82955246716
ISSN
1097-4628
DOI
10.1002/app.34966
language
English
LU publication?
yes
id
b043c3d1-55e1-4d69-8d7c-9b8fcf9ea288 (old id 2172238)
date added to LUP
2011-10-06 11:07:27
date last changed
2017-11-05 03:00:14
@article{b043c3d1-55e1-4d69-8d7c-9b8fcf9ea288,
  abstract     = {Poly (ethylene-co-vinyl acetate) (EVA)/clay nanocomposites containing two different organoclays with different clay loadings were prepared. The transport of gases (oxygen and nitrogen) through the composite membranes<br/><br>
was investigated and the results were compared. These studies revealed that the incorporation of nanoclays in the polymer increased the efficiency of the membranes toward barrier properties. It was also found that the barrier<br/><br>
properties of the membranes decreased with clay loadings. This is mainly due to the aggregation of clay at higher loadings. The morphology of the nanocomposites was studied by scanning electron microscopy, transmission<br/><br>
electron microscopy and X-ray scattering. Small angle X-ray scattering results showed significant intercalation of the polymer chains between the organo-modified silicate layers in all cases. Better dispersed silicate layer stacking and more homogeneous membranes were obtained for Cloisite 25A based nanocomposites compared with Cloisite 20A samples. Microscopic observations (SEM and TEM) were coherent with those results. The dispersion of clay platelets seemed to be maximized for 3 wt % of clay and agglomeration increased with higher clay loading. Wide angle X-ray scattering results showed no significant modifications in the crystalline structure of the EVA matrix because of the presence of the clays. The effect of free volume on the transport behavior was studied using positron annihilation spectroscopy. The permeability results have been correlated with various permeation models.},
  author       = {Wilson, Runcy and Plivelic, Tomás and Aprem, Abi Santhosh and Ranganathaiagh, C. and Kumar, S Anil and Thomas, Sabu},
  issn         = {1097-4628},
  keyword      = {EVA/organoclay nanocomposites,X-ray scattering (SAXS and WAXS),TEM,free volume,gas transport},
  language     = {eng},
  number       = {Online 30 September 2011},
  pages        = {3806--3818},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Applied Polymer Science},
  title        = {Preparation and Characterization of EVA/Clay Nanocomposites with Improved Barrier Performance},
  url          = {http://dx.doi.org/10.1002/app.34966},
  volume       = {123},
  year         = {2012},
}