Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 411051
Title Transient network topology of interconnected polyelectrolyte complex micelles
Author(s) Lemmers, M.; Voets, I.K.; Cohen Stuart, M.A.; Gucht, J. van der
Source Soft Matter 7 (2011)4. - ISSN 1744-683X - p. 1378 - 1389.
DOI https://doi.org/10.1039/c0sm00767f
Department(s) Physical Chemistry and Colloid Science
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) transfer radical polymerization - diblock copolymer micelles - coacervate core micelles - rheological properties - aqueous-solutions - associating polymers - poly(ethylene oxide) - telechelic polymers - methyl-methacrylate - triblock copolymer
Abstract In this paper we study transient networks formed by co-assembly of an ABA triblock copolymer with charged A blocks and neutral water-soluble B blocks, and an oppositely charged homopolymer. Above the CMC, the polymers associate into flowerlike micelles consisting of a polyelectrolyte complex core and a neutral corona of loops formed by the middle blocks. At higher concentrations, the micelles become connected to each other by bridging middle-blocks, leading to a physical network with visco-elastic properties. We use a combination of (dynamic) light scattering, small-angle X-ray scattering and rheometry, to characterize how the network structure changes with polymer concentration and ionic strength, and how these changes affect the macroscopic elastic properties of the network. We find that an increase in ionic strength leads to a decrease in aggregation number and size of the individual micelles, which simultaneously leads to an increase in the number density of micelles. These two effects compensate each other such that the probability of bridge formation is equal at all salt concentrations, meaning that the elastic modulus of the gels is independent of salt concentration
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