In:
Journal of Polymer Science, Wiley, Vol. 7, No. 2-3 ( 1951-08), p. 261-276
Abstract:
The intrinsic viscosity of cellulose xanthate solutions was studied as a function of the electrolyte content of the solvent, and found to decrease sharply with increase in electrolyte concentration. All electrolytes tested except sodium and lithium hydroxides produced essentially the same reduction in intrinsic viscosity for solutions of equivalent ionic strenghts, indicating that the effect was largely one of interaction between the solvent ions and the charged xanthate groups. Hydroxides induced a greater viscosity reduction. The reason for this was not fully resolved; however, indications were obtained that the hydroxides, in addition to behaving as electrolytes toward the charged xanthate groups, also interact with the hydroxyl groups on the parent cellulose chain. Light scattering measurements, as well as data on the variation of the intrinsic viscosity with molecular weight in various solvents, showed that the change in intrinsic viscosity with electrolyte concentration could be accounted for by a change in configuration, or degree of coiling of the molecule. Calculations indicated that in pure water cellulose xanthate should approach a rigid rod configuration whereas in 6% caustic coiling occurs and the molecule resembles more a random configuration.
Type of Medium:
Online Resource
ISSN:
0022-3832
,
1542-6238
DOI:
10.1002/pol.12.v7:2/3
DOI:
10.1002/pol.1951.120070212
Language:
English
Publisher:
Wiley
Publication Date:
1951
detail.hit.zdb_id:
2177610-6
detail.hit.zdb_id:
3004641-5
detail.hit.zdb_id:
1473448-5
