Abstract

The miscibility of blends of Guargum (GG) and Pectin studied over an extended range of concentrations in
water using the viscosity, ultrasonic velocity, and refractive index above blend solutions have been measured at
300C. The interaction parameters suggested by Chee
 and Sun
) were computed using the viscosity data to
probe the blend miscibility. These values revealed that GG/Pectin blend is immiscible when the Guargum
content is more than 40% in the blend. The effects of composition of blends on miscibility have been studied.
The miscibility results obtained from viscometric method have been confirmed by the ultrasonic velocity and
refractive index studies. The GG/Pectin films were prepared by solution casting method using water as solvent.
The blends thus obtained were characterized by FTIR, DSC, X-RD and SEM techniques and the results are also
used to probe the miscibility of these blends and confirmed its semicompatibile nature which may be due to the
interactions between -OH groups of Guargum and ether groups Pectin.