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231223s2010 xx |||||o 00| ||eng c |
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|a 10.1021/la902671r
|2 doi
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|a pubmed24n0639.xml
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|a DE-627
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|e rakwb
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|a eng
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| 100 |
1 |
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|a Lee, Sangwoo
|e verfasserin
|4 aut
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|a Path-dependent morphologies in oil/water/diblock copolymer mixtures
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|c 2010
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 24.03.2010
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|a Date Revised 26.01.2010
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Amphiphilic block copolymer surfactants have been studied primarily in binary or pseudobinary systems, where they form a variety of dispersions, including micelles and vesicles, characterized by extremely low critical micelle concentrations (CMCs). In this study, a poly(1,2-butadiene-b-ethylene oxide) (OB) diblock copolymer (M(n) = 33 kg/mol, and 72 wt % PEO) was combined with water (W) and 1,5-cyclooctadiene (C) in binary (OB/W and OB/C) and ternary (OB/W/C and OB/C/W) mixtures, where the order of components indicates the mixing sequence. The resulting morphologies were characterized by small-angle X-ray scattering (SAXS) and cryogenic scanning electron microscopy (cryo-SEM). Addition of 1,5-cyclooctadiene to premicellized OB in water (OB/W) leads to swelling of the initially spherical hydrophobic micelle cores followed by micelle fusion leading to three-dimensional network structures. Combining water with premixed OB in 1,5-cyclooctadiene (OB/C) transforms a periodic sheet-like lamellar microstructure into a complex state of phase separation built on water-swollen poly(ethylene oxide) bilayers, which are manifested as uniformly sized small vesicles. Thus, two entirely different microstructures, which are stable for at least a month, have been prepared from a single three-component formulation. This pronounced nonequilibrium phase behavior, attributed to the non-ergodic character of amphiphilic block copolymers, may offer new processing strategies for the preparation of desirable self-assembled structures
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|a Journal Article
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|a Arunagirinathan, Manickam Adhimoolam
|e verfasserin
|4 aut
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|a Bates, Frank S
|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 26(2010), 3 vom: 02. Feb., Seite 1707-15
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|x 1520-5827
|7 nnns
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| 773 |
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|g volume:26
|g year:2010
|g number:3
|g day:02
|g month:02
|g pages:1707-15
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|u http://dx.doi.org/10.1021/la902671r
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