Influence of polyacrylamide on the oxidative decomposition of sodium dithionite: Implications for vat dyeing processes
✍ Scribed by J. N. Etters
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- English
- Weight
- 432 KB
- Volume
- 47
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
A statistical analysis was made of the halftimes of oxidative decomposition of sodium dithionite at 25°C in alkaline aqueous solutions, having geometrically spaced specific surfaces and concentrations of polyacrylamide. The analysis reveals a strong relationship between solution-specific surface and resulting halftime, with halftime decreasing as specific surface increases; however, only the highest concentration of polyacrylamide, with a correspondingly high solution viscosity, is revealed to have a consistently significant effect on the rate of oxidative decomposition of dithionite. No significant effect on dithionite decomposition is observed for polyacrylamide concentrations that conceivably would be used in commercial vat dyeing processes. The findings suggest that the beneficial effect of high molecular weight polymers such as polyacrylamide in commercial vat dyeing is due solely to the function of the polymer to decrease the specific surface of the dithionite solution on the fabric, leading to decreased decomposition rates.