Rate of densification of gel during coagulation of viscose

Autor: Eric Wellisch, Maharaj K. Gupta, Leon Marker, Orville J. Sweeting
Rok vydání: 1965
Předmět:
Zdroj: Journal of Polymer Science Part A: General Papers. 3:711-722
ISSN: 1542-6246
0449-2951
DOI: 10.1002/pol.1965.100030227
Popis: We have developed a simple method which permits measurement of the rate of densification of the gel forming during the coagulation of viscose and in effect experimentally separates the coagulation process from the regeneration process. The method is based on changes in density of a drop of viscose as it passes through a column of a salt solution. In devising the experimental program, three assumptions have been made: (1) Stokes' law is assumed to be valid for the movement of a drop of viscose through a column of a salt solution; (2) the volumes of sodium cellulose xanthate and water are assumed additive in viscose, permitting the calculation of the density of anhydrous xanthate; (3) the mechanics of loss of water initially from a surface are assumed to be the same whether the area is planar or spherical, i.e., a drop of viscose initially dehydrates in the same manner as does a thin film. Using this experimental technique, we have studied the coagulation of viscose as a function of salt index, ripening temperature, type of salt, and concentration of salt.
Databáze: OpenAIRE
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