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Time-Lag Technique of Diffusion-Coefficient Measurement in Solution Spinning
- Wu, W., Paul, D.R.
- Textile research journal 1978 v.48 no.4 pp. 230-233
- coagulation, diffusivity, fabrics, polymers, solvents, spinning, sulfuric acid, textile fibers
- A simplified time-lag technique was developed to measure the average diffusion coefficient for solvent extraction during coagulation in wet spinning. The accumulated amount of solvent diffused from the uncoagulated fiber while dry-jet wet spinning into a finite spin bath was measured as a function of time. From this experiment a time-lag θ in the solvent built-up can he measured easily. From this, the average diffusion coefficient D can be determined from D = R ²/8θ, where R is the filament radius. Some experimental results using the time-lag technique in a polymer/sulfuric acid/water system were obtained and compared with results using a conventional measuring method.