Nanostructure of PEO-polyurethane-PEO triblock copolymer micelles in water.

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dc.contributor.authorCaba, BLen_AU
dc.contributor.authorZhang, Qen_AU
dc.contributor.authorCarroll, MRJen_AU
dc.contributor.authorWoodward, RCen_AU
dc.contributor.authorSt Pierre, TGen_AU
dc.contributor.authorGilbert, EPen_AU
dc.contributor.authorRiffle, JSen_AU
dc.contributor.authorDavis, RMen_AU
dc.date.accessioned2010-04-19T04:12:37Zen_AU
dc.date.accessioned2010-04-30T05:09:35Zen_AU
dc.date.available2010-04-19T04:12:37Zen_AU
dc.date.available2010-04-30T05:09:35Zen_AU
dc.date.issued2010-04-01en_AU
dc.date.statistics2010-04-01en_AU
dc.description.abstractNovel hydrophilic triblock copolymers which form micelles in aqueous solution were studied by static and dynamic light scattering (SLS and DLS), small angle neutron scattering (SANS) and densitometry. The polymers were symmetric A–B–A block copolymers having two poly(ethylene oxide) (PEO) tail blocks and a polyurethane (PU) center segment that contained pendant carboxylic acids. The aggregation number of the micelles decreased with increasing PEO mass content. When attempting to fit the SANS data it was found that no single model was suitable over the entire range of block lengths and PEO mass concentrations investigated here. For the polymer with the highest aggregation number, the data were fitted with a triblock model consisting of a homogeneous core with a corona of non-interacting Gaussian chains for which only two free parameters were required: the radius of the core and the radius of gyration of the corona. In this case, the core was found to be effectively dry. At lower aggregation numbers, a star polymer model generated significantly better fits, suggesting the absence of any identifiable central core structure. Good agreement was found between the sizes measured by DLS, SANS and theoretical predictions of micelle size from a density distribution theory. These results show that when significant changes in aggregation number occur, the nanostructure of the micelle can change substantially even for polymers that are remarkably similar. © 2010, Elsevier Ltd.en_AU
dc.identifier.citationCaba, B. L., Zhang, Q., Carroll, M. R. J., Woodward, R. C., St Pierre, T. G., Gilbert, E. P., Riffle, J.S., & Davis, R.M. (2010). Nanostructure of PEO-polyurethane-PEO triblock copolymer micelles in water. Journal of Colloid and Interface Science, 344(1), 81-89. doi:10.1016/j.jcis.2009.12.049en_AU
dc.identifier.govdoc1618en_AU
dc.identifier.issn0021-9797en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleJournal of Colloid and Interface Scienceen_AU
dc.identifier.pagination81-89en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jcis.2009.12.049en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3201en_AU
dc.identifier.volume344en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectCopolymersen_AU
dc.subjectWateren_AU
dc.subjectNanostructuresen_AU
dc.subjectPolyethylene glycolsen_AU
dc.subjectPolyurethanesen_AU
dc.subjectSmall angle scatteringen_AU
dc.titleNanostructure of PEO-polyurethane-PEO triblock copolymer micelles in water.en_AU
dc.typeJournal Articleen_AU
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