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231223s2011 xx |||||o 00| ||eng c |
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|a 10.1021/la104285z
|2 doi
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|a pubmed24n0686.xml
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|a eng
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|a Bernardini, C
|e verfasserin
|4 aut
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|a PMMA highlights the layering transition of PDMS in Langmuir films
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|c 2011
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 21.10.2014
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|a Date Revised 04.02.2014
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a We report a system consisting of a mixed Langmuir monolayer, made of water-insoluble, spreadable, fluid-like polymers polydimethylsiloxane (PDMS) and polymethylmethacrylate (PMMA) with a minority P(DMS-b-MMA) copolymer. We have performed both Langmuir trough pressure/area isotherm measurements and Brewster angle microscopy (BAM) observations and complement the experiments with molecularly detailed self-consistent field (SCF) calculations. PDMS undergoes a layering transition that is difficult to detect by BAM. Addition of PMMA gives contrast in BAM, now showing a two-phase system: if this would consist of separate two-dimensional (2D) PMMA and PDMS phases, a PDMS-PMMA diblock should accumulate at the phase boundary. However, the diblock copolymer of PDMS-PMMA failed to show the expected "lineactant" behavior, i.e., failed to accumulate at the phase boundary. The calculations point to a nontrivial arrangement of the polymer chains at the interface: in mixtures of the two homopolymers, in a rather wide composition ratio, we find a vertical (with respect to the air/water interfacial plane) configuration, with PMMA sitting preferably at the PDMS/water interface of the thicker PDMS film, during the PDMS layering phase transition. This also explains why the diblock copolymer is not a lineactant. Both PMMA and P(DMS-b-MMA) are depleted from the thin-thick PDMS film interface, and the line tension between the phases is, consequently, increased, in the binary mixtures as well as in the ternary ones
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|a Journal Article
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|a Stoyanov, S D
|e verfasserin
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|a Stuart, M A Cohen
|e verfasserin
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|a Arnaudov, L N
|e verfasserin
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|a Leermakers, F A 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 1992
|g 27(2011), 6 vom: 15. März, Seite 2501-8
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|x 1520-5827
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|g volume:27
|g year:2011
|g number:6
|g day:15
|g month:03
|g pages:2501-8
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|u http://dx.doi.org/10.1021/la104285z
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