The experimental results show that the impact strength of PVC/EVA blend strongly depends on EVA content

blending temperature and blending time. It reaches a maximum at 10 parts of EVA per 100 parts of PVC

and will be further increased when PE is added in. TEM observation confirms that the formation of EVA continuous network in PVC/EVA is responsible tor the high impact strength of the blend. EVA could promote the gelation of PVC

while PE could reduce the apparent viscosity of the Mend and has a delayed action on the gelation of PVC. A series of mathematic models are established by means of binary linear regression to correlate the melt viscosity of the blend with both shear stress and temperature. The flow activation energy of PVC/EVA decreases with increasing EVA content. The addition of EVA re-duces the non-Newtonian flow index

indicating the increased dependence of the melt viscosity of the blend on the shear stress.