dc.contributor.author |
Massinga, Pedro Horacio
|
|
dc.contributor.author |
Focke, Walter Wilhelm
|
|
dc.contributor.author |
Del Fabbro, Olinto
|
|
dc.contributor.author |
Radusch, Hans-Joachim
|
|
dc.date.accessioned |
2015-06-26T06:11:06Z |
|
dc.date.available |
2015-06-26T06:11:06Z |
|
dc.date.issued |
2014-09 |
|
dc.description.abstract |
South African Koppies bentonite was organo-modified with single tail and double tail alkyl
ammonium cationic surfactants with the latter intercalated both below and above the clay CEC.
Corresponding poly(ethylene-co-vinylacetate) nanocomposites were prepared by twin-screw melt
compounding. Transmission electron microscopy indicated the presence of mixed nano- and
micron-sized clay morphologies. X-ray diffraction studies revealed that the crystallinity of the
particles improved and that the d-spacing values increased on incorporating the clays in the
polymer matrix. It is postulated that, rather than indicating polymer co-intercalation, this is caused
by further intercalation of either excess surfactants or surfactant residues that were released by
shear delamination of the clays during compounding. Improved mechanical properties were
realized especially when using the clay containing the longer double tail surfactant
intercalated at levels in excess of the cation exchange capacity of the clay. The
nanocomposites showed improved tensile modulus and elongation at break values at the expense of a reduction in impact strength while tensile strength was about the same as for the
neat polymer. |
en_ZA |
dc.description.embargo |
2015-09-30 |
en_ZA |
dc.description.librarian |
hb2015 |
en_ZA |
dc.description.sponsorship |
The Institutional Research Development Programme (IRDP), the South Africa/Mozambique Collaborative Programme of the National Research Foundation (NRF), and the Mozambican Research Foundation (FNI) |
en_ZA |
dc.description.uri |
http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1548-0585 |
en_ZA |
dc.identifier.citation |
Massinga Jr, PH, Focke, WW, Del Fabbro, O & Radusch, H-J 2014, 'EVA nanocomposites based on South African Koppies clay', Journal of Vinyl and Additive Technology, vol. 20, no. 3, pp. 143-151. |
en_ZA |
dc.identifier.issn |
1083-5601 (print) |
|
dc.identifier.issn |
1548-0585 (online) |
|
dc.identifier.other |
10.1002/vnl.21342 |
|
dc.identifier.uri |
http://hdl.handle.net/2263/45788 |
|
dc.language.iso |
en |
en_ZA |
dc.publisher |
Wiley |
en_ZA |
dc.rights |
© 2014 Society of Plastics Engineers. This is the pre-peer reviewed version of the following article : EVA nanocomposites based on South African Koppies clay, Journal of Vinyl and Additive Technology, vol. 20, no. 3, pp. 143-151, 2014, doi : 10.1002/vnl.21342. The definite version is available at : http://onlinelibrary.wiley.comjournal/10.1002/(ISSN)1548-0585 |
en_ZA |
dc.subject |
Clay |
en_ZA |
dc.subject |
Nanocomposites |
en_ZA |
dc.subject |
Poly(ethylene-co-vinylacetate) |
en_ZA |
dc.subject |
Exfoliation |
en_ZA |
dc.subject |
Intercalation |
en_ZA |
dc.subject |
South African Koppies bentonite |
en_ZA |
dc.title |
EVA nanocomposites based on South African Koppies clay |
en_ZA |
dc.type |
Postprint Article |
en_ZA |