Linear vicoelastic rheology as a tool for the investigation of the chemical architecture of syndiotactic polypropylene

In this work we studied the rheology of a series of syndiotactic polypropylenes (sPP) of varying degree of tacticity. The linear viscoelastic properties of the different polymer samples were measured in the melt state. Experiments allowed the determination of the sPP plateau modulus and, as a consequence, of the molecular weight between entanglements. The experimental results show a well defined correlation between the molecular weight between entanglements and the degree of tacticity of sPP