Deswelling of highly crosslinked polystyrene microgel colloids in colloid-polymer mixtures close to the glass transition lines
The question of osmotic deswelling of microgel colloids in mixtures with free polymer is of utmost importance for understanding the extraordinarily large shift of the glass transition line to higher volume fractions in these systems. To study the extent of osmotic deswelling we investigate the influence of linear polystyrene (PS) polymer addition to highly concentrated dispersions of PS microgels by measuring the particle form factor of fully deuterated PS tracer particles in an index-matched host of protonated PS microgels and protonated PS chains. In a previous beam time we demonstrated for two free polymer to microgel size ratios that is possible to resolve very small changes of the tracer radius using three detector positions and a doubled detector resolution on D11. Now we want to finish the project by measuring the tracer P(q) for additional state points in order to monitor systematically the variation of the microgel deswelling which will allow for a clear-cut comparison with macrogel deswelling data and to clarify the role of osmotic deswelling for the shift of the glass transition line.
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BURGER Stefanie; BARTSCH Eckhard; LINDNER Peter and WERNER Marcel. (2015). Deswelling of highly crosslinked polystyrene microgel colloids in colloid-polymer mixtures close to the glass transition lines. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-416
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