The role of microstructure, molar mass and morphology on local relaxations in isotactic polypropylene. The α relaxation

Among the factors considered, microstructure and n1 in particular have been found to drive mainly the quality of the α relaxation. Concerning the intensity, it has been observed that some microstructural features related to n1 must be fulfilled for this dynamics to take place. Provided this requirements are met, the intensity of the α relaxation depends on the final crystalline distribution resulting from a given molar mass, microstructure and processing conditions.