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The thermoreversible gelation of blends of polystyrene-block-poly(ethylene/butylene)-block-polystyrene (SEBS) and polystyrene-block-poly(ethylene/propylene) (SEP) copolymers in n-octane was studied. The solvent is selective for the polyolefine blocks of the copolymers. The influence of the composition of the hybrid gels on the sol–gel transition and on the mechanical properties of the gels was analyzed...
The thermorheological properties of a range of hydroxypropyl methylcellulose (HPMC) solutions have been studied with a view to determining the concentration and substitution dependence of the gelation process. Solutions containing up to 20% w/v HPMC were prepared using three grades of material (METHOCEL 1 1Trademark of The Dow Chemical Company. E4M, F4M, K4M). Rheological studies were performed...
We report on a study of the gelation phenomenon of poly(vinyl alcohol) in water through freezing-thawing cycles. From self-exclusion chromatography experiments carried out on redissolved gels and microcalorimetry measurements performed on gels we come to the conclusion that gelation is rather of chemical than of physical nature.
In situ refractive index technique was used to study the gelation process in the free-radical cross-linking copolymerization (RCC) of N,N-dimethylacrylamide with N,N'-methylenebisacrylamide as the cross-linker. The change of refractive index was measured and used to monitor the gelation process. The influence of different polymerization conditions on the gelation process, such as monomer, cross-linker...
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