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231224s2012 xx |||||o 00| ||eng c |
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|a 10.1021/la302468j
|2 doi
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|a eng
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1 |
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|a Niskanen, Jukka
|e verfasserin
|4 aut
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| 245 |
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|a Interfacial and fluorescence studies on stereoblock poly(N-isopropylacryl amide)s
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|c 2012
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 06.03.2013
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|a Date Revised 20.11.2014
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Aqueous solution and water-air interfacial properties of associative thermally responsive A-B-A stereoblock poly(N-isopropylacryl amide), PNIPAM, polymers were studied and compared to atactic PNIPAM. The A-B-A polymers consist of atactic PNIPAM as a hydrophilic block (either A or B) and a water-insoluble block of isotactic PNIPAM. The surface tensions of aqueous PNIPAM solutions were measured as a function of both temperature and concentration. The isotactic blocks did not have an effect on the surface activity of the solutions. Rheological measurements on the water-air interface showed that the aggregated PNIPAMs containing isotactic blocks increased the elasticity of the surface significantly as compared to the atactic reference upon heating. Two fluorescence probes, pyrene and (4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (4HP), added to the aqueous polymer solutions were concluded to reside in surroundings with lower polarity and increased microviscosity in cases when the polymers contained isotactic blocks, as compared to ordinary atactic polymers
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Acrylamides
|2 NLM
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|a Acrylic Resins
|2 NLM
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|a Polymers
|2 NLM
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|a poly-N-isopropylacrylamide
|2 NLM
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|a 25189-55-3
|2 NLM
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|a Wu, Cynthia
|e verfasserin
|4 aut
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1 |
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|a Ostrowski, Maggie
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Fuller, Gerald G
|e verfasserin
|4 aut
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1 |
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|a Tenhu, Heikki
|e verfasserin
|4 aut
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| 700 |
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|a Hietala, Sami
|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 1992
|g 28(2012), 41 vom: 16. Okt., Seite 14792-8
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|x 1520-5827
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|g volume:28
|g year:2012
|g number:41
|g day:16
|g month:10
|g pages:14792-8
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