Miscibility Studies of Blends of PPG and PEG using Viscosity Technique.

Viscosity method is simple and it offers very useful information about the relationship between dilute solution properties and bulk structure of the polymer blend. In the present study, an attempt has been made to blend PPG 500 with PPG 4000 and PEG 4000 in Toluene at 303K at 1% concentration. The blend compositions were formed in the ratio 0:1, 0.2:0.8, 0.4:0.6, 0.5:0.5, 0.6:0.4, 0.8:0.2, 1:0. Relative viscosity of the blend compositions was determined and the values are nonlinear which showed incompatibility. Miscibility nature of the blends were determined further using additive law, log additive law and free volume additive law and the experimental values in all the cases showed negative deviation, which is a characteristic of immiscible blend. The miscibility nature of the blend was further confirmed through ultrasonic velocity and optical microscopic techniques. Both the blends showed immiscibility. [ABSTRACT FROM AUTHOR]