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231223s2006 xx ||||| 00| ||eng c |
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|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Carroll, Gregory T
|e verfasserin
|4 aut
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| 245 |
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|a Photoactive additives for cross-linking polymer films
|b Inhibition of dewetting in thin polymer films
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|c 2006
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
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|2 rdamedia
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|b nc
|2 rdacarrier
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|a Date Completed 21.09.2007
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|a Date Revised 22.08.2006
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|a published: Print
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|a Citation Status MEDLINE
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|a In this report, we describe a versatile photochemical method for cross-linking polymer films and demonstrate that this method can be used to inhibit thin polymer films from dewetting. A bifunctional photoactive molecule featuring two benzophenone chromophores capable of abstracting hydrogen atoms from various donors, including C-H groups, is mixed into PS films. Upon exposure to UV light, the bis-benzophenone molecule cross-links the chains presumably by hydrogen abstraction followed by radical recombination. Photoinduced cross-linking is characterized by infrared spectroscopy and gel permeation chromatography. Optical and atomic force microscopy images show that photocrosslinked polystyrene (PS) thin films resist dewetting when heated above the glass transition temperature or exposed to solvent vapor. PS films are inhibited from dewetting on both solid and liquid substrates. The effectiveness of the method to inhibit dewetting is studied as a function of the ratio of cross-linker to macromolecule, duration of exposure to UV light, film thickness, the driving force for dewetting, and the thermodynamic nature of the substrate
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Research Support, U.S. Gov't, Non-P.H.S.
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|a Cross-Linking Reagents
|2 NLM
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| 650 |
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|a Polystyrenes
|2 NLM
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|a Sojka, Melissa E
|e verfasserin
|4 aut
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1 |
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|a Lei, Xuegong
|e verfasserin
|4 aut
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|a Turro, Nicholas J
|e verfasserin
|4 aut
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|a Koberstein, Jeffrey T
|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 22(2006), 18 vom: 29. Aug., Seite 7748-54
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:22
|g year:2006
|g number:18
|g day:29
|g month:08
|g pages:7748-54
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