Abstract
Evaporation of dimethyl formamide (DMF) from acrylonitrile polymer solution was investigated at various temperatures. The diffusion constants of DMF in the acrylonitrile polymer film were calculated. The evaporation mechanism of DMF from acrylonitrile polymer solution was compared with that of acetone from cellulose acetate solution and their real spinning condition was discussed.
The results of the study are as follows:
1) Existence of solidified film forming period and falling rate period are recognized.
2) There is a linear relationship between the atmosphere temperature and the diffusion constants.
3) The diffusion constant of DMF is smaller than that of acetone.
4) The diffusion constants obtained in this experiment is smaller than the literature values obtained from wet spinning of acrylonitrile polymer solution.
