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Light scattering studies on the ripening of viscose solution
Author(s) -
Ghosh Kalyan K.
Publication year - 1971
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1971.070150303
Subject(s) - viscose , xanthate , cellulose , degree of polymerization , chemistry , regenerated cellulose , polymer chemistry , alkali metal , materials science , polymerization , chemical engineering , organic chemistry , polymer , engineering
Investigations were made on cellulose xanthate molecular weights by light scattering during the ripening of the solutions of (a) viscose‐containing colored thio salts and (b) pure cellulose xanthate separated from viscose. Though an apparent reduction in molecular weight was recorded with time of ripening for the viscose solution, no such fall was observed with pure cellulose xanthate. The apparent fall of molecular weight in the case of viscose has been shown to be due to the increasing absorption of the incident beam and to the change in the value of dn/dc with progressive color formation. Reproducible results can be obtained for cellulose xanthate solutions freed from color. Intrinsic viscosity of the viscoses and the degree of polymerization (D.P.) of the regenerated cellulose from viscoses during ripening were also measured and found to be constant. The results indicate that no degradation of alkali cellulose molecule takes place during the ripening process, irrespective of the state of degradation of alkali cellulose from which the viscose is made.