Sound velocities in polymer blends and the compatibility

The longitudinal and transverse sound velocities in polymer blends of polyv inylchloride with polystyrene or polymethylmethacrylate were measured as a function of the polyvinylchloride content. The relationship between the sou nd velocity and composition deviated slightly from linearity. The shear, bu lk, Young's modulus and Poisson's ratio were evaluated from the sound veloc ities and density. These elastic properties changed monotonically with an i ncreasing content of polyvinylchloride. Young's modulus of polymer blends w as analyzed on the basis of compatible and incompatible models. The compati bility of the polymer blends was discussed on the basic of the sound veloci ty measurement, thermal analysis, dynamic thermomechanical analysis and aco ustic micrography.