ISSN:
0021-8995
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Maschinenbau
,
Physik
Notizen:
The influences of caustic, zinc, by-product sulfur, and additives on the degree of swelling and the rate of neutralization of viscose are reported. A film technique showed a marked decrease in gel swell factors as the caustic concentration was increased from 5.5 to 7%. In the presence of zinc and by-product sulfur, the viscose additive retards the regeneration process and reduces the gel swell. On mixing various amounts of “white” and conventional viscoses, a minimum value in gel swell occurs with an equal mixture of “white” and regular viscoses. A similar relationship is obtained on adding a polyethylene oxide derivative or an amine to the viscose; namely, a minimum point is reached at 50-70% by-product sulfur, but in these cases as the by-product sulfur is increased to 100%, the gel swell values level off. The actual numerical values of the gel swells are considerably lower for the mixed viscoses which contain additives in comparison with those without an additive. A gradual retardation of the neutralization rate is observed as the amount of by-product sulfur is increased in viscoses containing a polyethylene oxide derivative. A mechanism explaining the retardation of neutralization rates and reduction of the gel swell is proposed, based on the formation of a coordination complex between the additive, zinc ions, by-product sulfur, and the xanthate.
Zusätzliches Material:
4 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/app.1959.070020511
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