Abstract
Filterability of dimethyl formamide solution (20 and 26wt. %) of acrylonitrile polymer was measured at 50°C. The KW value was taken as a measure of filterability and the effects of dissolving temperature and dissolving time on the KW value were studied. The KW value was calculated by means of the following equation:
where V1 is the weight of filtrate for 10 min., V2 is the weight of filtrate for 20 min. after that, KW is the KW value.
The results obtained are as follows:
1) The solution dissolved at higher temperature and for longer time has smaller KW values and better filterability than that dissolved at lower temperature and for shorter time.
2) No special correlation exists between solution viscosity and KW value.
