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231224s2015 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.5b00817
|2 doi
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|a pubmed24n0827.xml
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|a (NLM)25879684
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a de Molina, Paula Malo
|e verfasserin
|4 aut
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|a Phase Behavior of Nonionic Microemulsions with Multi-end-capped Polymers and Its Relation to the Mesoscopic Structure
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|c 2015
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 08.07.2015
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|a Date Revised 12.05.2015
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a The polymer architecture of telechelic or associative polymers has a large impact on the bridging of self-assembled structures. This work presents the phase behavior, small angle neutron scattering (SANS), dynamic light scattering (DLS), and fluorescence correlation spectroscopy (FCS) of a nonionic oil-in-water (O/W) microemulsion with hydrophobically end-capped multiarm polymers with functionalities f = 2, 3, and 4. For high polymer concentrations and large average interdroplet distance relative to the end-to-end distance of the polymer, d/R(ee), the system phase separates into a dense, highly connected droplet network phase, in equilibrium with a dilute phase. The extent of the two-phase region is larger for polymers with similar length but higher f. The interaction potential between the droplets in the presence of polymer has both a repulsive and an attractive contribution as a result of the counterbalancing effects of the exclusion by polymer chains and bridging between droplets. This study experimentally demonstrates that higher polymer functionalities induce a stronger attractive force between droplets, which is responsible for a more extended phase separation region, and correlate with lower collective droplet diffusivities and higher amplitude of the second relaxation time in DLS. The viscosity and the droplet self-diffusion obtained from FCS, however, are dominated by the end-capped chain concentration
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|a Journal Article
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|a Ihlefeldt, Franziska Stefanie
|e verfasserin
|4 aut
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|a Prévost, Sylvain
|e verfasserin
|4 aut
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|a Herfurth, Christoph
|e verfasserin
|4 aut
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|a Appavou, Marie-Sousai
|e verfasserin
|4 aut
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|a Laschewsky, André
|e verfasserin
|4 aut
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|a Gradzielski, Michael
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 31(2015), 18 vom: 12. Mai, Seite 5198-209
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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|g volume:31
|g year:2015
|g number:18
|g day:12
|g month:05
|g pages:5198-209
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|u http://dx.doi.org/10.1021/acs.langmuir.5b00817
|3 Volltext
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