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The influence of the stretch ratio on the rate of diffusion in a wet‐spinning process
Author(s) -
Doppert H. L.,
Harmsen G. J.
Publication year - 1973
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.1973.070170319
Subject(s) - spinning , protein filament , diffusion , diffusion process , materials science , thermodynamics , coagulation , chemistry , composite material , physics , psychology , knowledge management , innovation diffusion , psychiatry , computer science
This article describes diffusion experiments on a single filament spinning set. The aim was to find phenomena which may occur in any wet‐spinning process. An alkaline poly(vinyl alcohol) solution containing an indicator was spun out into a coagulation bath containing Na 2 SO 4 , after which the filament was guided into an acidic second bath. The first bath served to deswell the filament in order to avoid contamination in the diffusion study. In the second bath the diffusion of H + and OH − ions was studied by measuring the distance which had to be covered by the filament in order to produce a color change of the indicator at the center of the filament. The equation for cylindrical diffusion was tested at various mechanical adjustments of the spinning set. It was found that the rate of diffusion decreases with increasing stretch ratio. Moreover, the relevant diffusion equation is qualitatively very well applicable to the phenomena considered, provided the applied stretch ratio is taken into account.