V K Aswal et al 2007 J. Phys.: Condens. Matter 19 116101 doi:10.1088/0953-8984/19/11/116101
V K Aswal1, A G Wagh1 and M Kammel2
Show affiliationsSANS measurements have been performed on the water-soluble PEO–PPO–PEO triblock copolymer P85 [(EO)26(PO)39(EO)26] in the presence of salts KCl, KF and K2CO3 in aqueous solution. Addition of these salts entropically favours dehydration from the micelles (similar to that of increasing temperature) and this leads to the formation of rodlike block copolymer micelles at ambient temperature. The rodlike micelles coexist with spherical micelles at higher salt concentrations or temperatures in these systems even up to the onset of phase separation. The hydration properties of the salt anions determine the population of the rodlike micelles.
61.25.H- Macromolecular and polymers solutions; polymer melts
61.05.fg Neutron scattering (including small-angle scattering)
Issue 11 (21 March 2007)
Received 12 December 2006, in final form 20 January 2007
Published 27 February 2007
V K Aswal et al 2007 J. Phys.: Condens. Matter 19 116101
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