Rheology of a cellulose graft copolymer. Comparison with other closely packed gel thickeners
✍ Scribed by N. W. Taylor; E. B. Bagley
- Publisher
- John Wiley and Sons
- Year
- 1977
- Tongue
- English
- Weight
- 369 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Hydrolyzed cellulose-polyacrylonitrile graft copolymer is a polyelectrolyte gel suspension with a high viscosity in water. It is a closely packed swollen gel particle suspension in the appropriate concentration range and has similar rheological properties to other thickeners of this type. Viscosities 7 in either water or salt solution are reduced to a single master curve by use of the reduced viscosity function q/cQ, where c is weight fraction of polymer and Q is swelling volume in excess solvent of the same ionic strength. The effective molecular weight between crosslinks, M c , determined from shear modulus, corresponds to M , values for other closely packed gel thickeners of similar qlcQ.
Among all examples of this class of thickener, the plateau values of q/cQ, which occur a t cQ > 2, are approximately inversely proportional to M , .