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231223s2005 xx ||||| 00| ||eng c |
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|a eng
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| 100 |
1 |
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|a Reihs, Karsten
|e verfasserin
|4 aut
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| 245 |
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|a A reversibly switching block copolymer surface
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|c 2005
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| 336 |
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
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|2 rdacarrier
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|a Date Completed 04.05.2007
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|a Date Revised 02.11.2005
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a We present linear (AB)(n)() multiblock copolymers that exhibit a thermally induced reversible alteration of the surface composition at a sharply defined transition temperature T(s) of 120-170 degrees C depending on the polymer structure. At temperatures below T(s) the surface consists of block A, a 4,4'-methylenediphenyl diisocyanate (4,4'-MDI) type polyurea, whereas above T(s) the hydrophobic block B, a poly(ricinoleic acid hexanediol ester) dominates the surface composition. The ratio of surface concentrations c(A)/c(B) changes by a factor of at least 1000 within an analyzed depth of approximately 10 A. The full A-B surface transition is obtained within minutes. A mechanism is proposed where microphase crystallization of block A in the bulk effectively locks surface segregation of the hydrophobic block B, yielding an A-rich surface. The topology of the copolymers imposes sufficient restrictions for the lateral separation of the connected constituents such that surface segregation is largely reduced. Only above the transition temperature T(s) of microphase crystallization of block A can block B segregate to the surface, yielding a B-rich surface. Such a scheme of competing self-organizing processes in copolymers may potentially be used to reversibly switch surface properties such as adhesion and wetting in various applications
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|a Journal Article
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1 |
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|a Voetz, Matthias
|e verfasserin
|4 aut
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| 773 |
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8 |
|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1991
|g 21(2005), 23 vom: 08. Nov., Seite 10573-80
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|x 0743-7463
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|g volume:21
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|g month:11
|g pages:10573-80
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