Thermodynamic considerations of microgel swelling behavior

Langmuir : the ACS Journal of Surfaces and Colloids
V T PinkrahM J Snowden

Abstract

A simple but novel thermodynamic model is presented, based upon van't Hoff analysis, for the reversible swelling behavior of colloidal microgels. The swelling, as a function of temperature, of poly(N-isopropylacrylamide/N,N'-methylenebisacrylamide) as well as poly(N-isopropylacrylamide/vinylpyridine/N,N'-methylenebisacrylamide) and poly(N-isopropylacrylamide/acrylic acid/N,N'-methylenebisacrylamide) microgel dispersions in H2O and D2O has been studied by photon correlation spectroscopy (PCS). PCS data was used to obtain the hydrodynamic diameter and hence the volume of the microgels (before and after reconstitution following freeze-drying) as a function of temperature. The choice of standard reference states, for analyzing the data attained, is discussed, and the one selected is that of the volume of the microgels at 333 K in H2O. For all microgels examined the volume, at this temperature, is shown to be independent of solvent (H2O, D2O). The derived data has allowed the exploration of a novel thermodynamic approach to the study of the swelling behavior of the microgels. The constant volume, at 333 K, for each of the polymer systems constituting the microgels is suggested to be an intrinsic property of the polymers themselves.

Citations

Mar 22, 2008·Journal of Colloid and Interface Science·Orawan PinprayoonBrian R Saunders
May 29, 2007·Journal of Colloid and Interface Science·Begum ElmasAli Tuncel
Jan 28, 2006·Angewandte Chemie·Jongseong KimL Andrew Lyon
Oct 4, 2008·Angewandte Chemie·Manuel Serrano RuizAntonio Fernandez-Barbero
Apr 15, 2008·Soft Matter·Tony J Freemont, Brian R Saunders
Feb 23, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Helene DalmontBrian R Saunders
Jun 24, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Michael FraylichBrian Saunders

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