Ultrasonic investigation on compatibility of PVC-modified liquid natural rubber blends

Abstract

The extent of compatibility of the blend solutions poly(vinyl chloride)–liquid natural blends (PVC–LNR), PVC–expodized LNR-20 (PVC–ELNR-20), and PVC–ELNR-50 has been studied using an ultrasonic technique. The variation of ultrasonic velocity with composition is nonlinear in the case of blends of PVC–LNR and PVC–ELNR-20, showing incompatibility. The ultrasonic velocity versus composition plot for PVC–ELNR-50 showed linear behavior showing compatibility. The above behavior was confirmed by heat of mixing calculations as well as ultrasonic attenuation measurements. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 785–790, 1998