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231224s2014 xx |||||o 00| ||eng c |
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|a 10.1021/la501861t
|2 doi
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|a eng
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|a FitzGerald, Paul A
|e verfasserin
|4 aut
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|a Temperature- and pH-responsive micelles with collapsible poly(N-isopropylacrylamide) headgroups
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|c 2014
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|a Text
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|a ƒaComputermedien
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|a Date Completed 22.04.2015
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|a Date Revised 15.07.2014
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a We have studied the micelle formation and phase behavior of a series of temperature- and pH-responsive surfactants prepared by controlled radical (RAFT) polymerization. These C12NIPAMm surfactants consist of a dodecyl tail, a poly(N-isopropylacrylamide) (polyNIPAM) headgroup with average degrees of polymerization of between 7 and 96, and an ionizable carboxylate group. In the un-ionized state, these surfactants phase separate on warming toward a lower critical solution temperature (LCST), which decreases as the length of the NIPAM group is decreased. This is in agreement with the behavior of conventional nonionic poly(ethylene oxide)-based surfactants but is very different from that of polyNIPAM oligomer solutions. Small angle neutron scattering (SANS) shows that these surfactants self-assemble into micelles consisting of a nearly spherical hydrophobic core surrounded by a "hairy" polyNIPAM shell far below their LCST. Upon warming, the micelles undergo a sphere-to-rod transition induced by the collapse of the polyNIPAM shell, causing a reduction in the headgroup area. In the un-ionized state the demixing follows at the LCST, but a single charge on the free polymer end completely suppresses phase separation, allowing micelles to undergo a shape change but remain dissolved
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|a Journal Article
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|a Gupta, Sushen
|e verfasserin
|4 aut
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|a Wood, Kathleen
|e verfasserin
|4 aut
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|a Perrier, Sébastien
|e verfasserin
|4 aut
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|a Warr, Gregory G
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 30(2014), 27 vom: 15. Juli, Seite 7986-92
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|g volume:30
|g year:2014
|g number:27
|g day:15
|g month:07
|g pages:7986-92
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