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231224s2014 xx |||||o 00| ||eng c |
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|a 10.1021/la403666y
|2 doi
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|a pubmed24n1401.xml
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|a (DE-627)NLM234413395
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|a (NLM)24417283
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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1 |
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|a Alswieleh, Abdullah M
|e verfasserin
|4 aut
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|a Spatial control over cross-linking dictates the pH-responsive behavior of poly(2-(tert-butylamino)ethyl methacrylate) brushes
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|c 2014
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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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|2 rdacarrier
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|a Date Completed 21.10.2014
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|a Date Revised 08.05.2024
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Surface-initiated atom transfer radical polymerization (ATRP) of 2-(tert-butylamino)ethyl methacrylate (TBAEMA) produced pH-responsive secondary amine-functionalized polymer brushes with dry thicknesses ranging from 4 to 28 nm, as determined by ellipsometry. At low pH, linear PTBAEMA brushes became protonated and highly swollen; brush collapse occurred when the solution pH was increased to ca. 7.7 due to deprotonation. PTBAEMA brushes were subsequently cross-linked using tolylene-2,4-diisocyanate-terminated poly(propylene glycol) (PPG-TGI) in either THF (a good solvent for PTBAEMA) or n-hexane (a poor solvent). The intensity of the C-C-O component (286.5 eV) in the C1s X-ray photoelectron spectrum increased after reaction with PPG-TDI, suggesting that cross-linking was successful in both solvents. Ellipsometry studies indicated that the pH-responsive behavior of these cross-linked brushes is dictated by the spatial location of the PPG-TDI cross-linker. Thus, uniformly cross-linked brushes prepared in THF became appreciably less swollen at a given (low) pH than surface-cross-linked brushes prepared in n-hexane. Micro- and nanopatterned PTBAEMA brushes were prepared via UV irradiation and interference lithography, respectively, and characterized by atomic force microscopy. The change in brush height was determined as a function of pH, and these AFM observations correlated closely with the ellipsometric studies
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Cross-Linking Reagents
|2 NLM
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|a Methacrylates
|2 NLM
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|a poly(2-(tert-butylamino)ethyl methacrylate)
|2 NLM
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|a Cheng, Nan
|e verfasserin
|4 aut
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|a Leggett, Graham J
|e verfasserin
|4 aut
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| 700 |
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|a Armes, Steven P
|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 30(2014), 5 vom: 11. Feb., Seite 1391-400
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
1 |
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|g volume:30
|g year:2014
|g number:5
|g day:11
|g month:02
|g pages:1391-400
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|u http://dx.doi.org/10.1021/la403666y
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