STUDIES ON THE PRODUCTION OF ACRYLIC FIBER BY WET SPINNING

(3) ON THE PHYSICAL PROPERTIES OF NaCNS AQUEOUS SOLUTION

Abstract

1. Specific gravity -Specific gravity of NaCNS aqueous solution of concentration from 10.35wt % to 57.62% was measured at the temperature of 0°C to 40°C. y=-0.0003585z+0.00001344x²+0.0055x+0.9999 was the result. y=specific gravity z=measuring temperature °C x=NaCNS concentration in weight percentage.
2. Refractive Index -Refractive index of NaCNS aqueous solution of concentration from of wt 0% to 60% was measured at 30°C, using Abbe Refractometer.
3. Freezing point -Freezing point of NaCNS aqueous solutions of which concentration ranged from 0% to 58% were measured. Up to the 20% NaCNS concentration, the degree of depression of freezing point was about 0.67°C/1% NaCNS
4. Specific heat -A formula, c (specific heat)=-0.000579x+0.988 was obtained in the range 10% to 58% NaCNS concentration.
5. Viscosity -The relative viscosity of NaCNS aqueous solution against water was measured at 30°C. The values of relative viscosity at the NaCNS concentration of 10.8% and 58.2% were 1.055 and 6.453 respectively. In the temperature range from 9°C to 60°C, the relative viscosity of NaCNS aqueous solution of 10%, 35% and 60% concentration was measured. The relative viscosity of NaCNS aqueous solution at 9°C was 9.801, while at 60°C it became 4.155.
6. Boiling point and latent heat of evaporation -Boiling points of NaCNS aqueous solution of 35% and 58% weignt concentration were measured at the pressure of 760 to 240mm Hg. For instance, the boiling points of the above solutions at 240mm Hg were 78.8°C and 96.7°C. Latent heat of evaporation was calculated in relation with pressure and boiling point.
7. Solubility of alkali metal salts into concentrated NaCNS aqueous solution -Various alkali metal salts were tested. The result proved that nitrate should be noticed for its higher soluble nature.