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231223s2010 xx |||||o 00| ||eng c |
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|a 10.1021/la902285t
|2 doi
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|a eng
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| 100 |
1 |
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|a Laloyaux, Xavier
|e verfasserin
|4 aut
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| 245 |
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|a Surface and bulk collapse transitions of thermoresponsive polymer brushes
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|c 2010
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 11.03.2010
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|a Date Revised 13.01.2010
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a We elucidate the sequence of events occurring during the collapse transition of thermoresponsive copolymer brushes based on poly(di(ethyleneglycol) methyl ether methacrylate) chains (PMEO2MA) grown by atom-transfer radical polymerization (ATRP). The collapse of the bulk of the brush is followed by quartz crystal microbalance measurements with dissipation monitoring (QCM-D), and the collapse of its outer surface is assessed by measuring equilibrium water contact angles in the captive bubble configuration. The bulk of the brush collapses over a broad temperature interval (approximately 25 degrees C), and the end of this process is signaled by a sharp first-order transition of the surface of the brush. These observations support theoretical predictions regarding the occurrence of a vertical phase separation during collapse, with surface properties of thermoresponsive brushes exhibiting a sharp variation at a temperature of T(br)(surf). In contrast, the bulk properties of the brush vary smoothly, with a bulk transition T(br)(bulk) occurring on average approximately 8 degrees C below T(br)(surf) and approximately 5 degrees C below the lower critical solution temperature (LCST) of free chains in solution. These observations should also be valid for planar brushes of other neutral, water-soluble thermoresponsive polymers such as poly(N-isopropylacrylamide) (PNIPAM). We also propose a way to analyze more quantitatively the temperature dependence of the QCM-D response of thermoresponsive brushes and deliver a simple thermodynamic interpretation of equilibrium contact angles, which can be of use for other complex temperature-responsive solvophilic systems
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|a Journal Article
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1 |
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|a Mathy, Bertrand
|e verfasserin
|4 aut
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|a Nysten, Bernard
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Jonas, Alain M
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1991
|g 26(2010), 2 vom: 19. Jan., Seite 838-47
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|x 1520-5827
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|g volume:26
|g year:2010
|g number:2
|g day:19
|g month:01
|g pages:838-47
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| 856 |
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|u http://dx.doi.org/10.1021/la902285t
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