TY - CONF UR - http://www.icpc-conference.org/previous_editions/2nd_icpc_valencia_2008 TI - Study of the Molecular Weight Influence on the Formation of the ß-polymorph in Metallocenic Isotactic Polypropylene Y1 - 2009/// AV - public PB - Wiley-VCH Verlag Berlin ID - upm3867 N2 - Isotactic polypropylene, iPP, is one of the most important thermoplastic polymers due to its low manufacturing cost and rather versatile properties. iPP exhibits a very interesting polymorphic behavior depending on the polymerization procedure, thermal history and use of different nucleating agents. Recently, studies on different aspects of the iPP ?-polymorph have been published [1, 2]. This paper completes these previous works by analyzing the formation of the ?-polymorph starting from samples of metallocenic iPP of different molecular weight. We also consider the effect of the cooling rate in the appearance of ?-polymorph in the iPP samples that were studied. T2 - 2nd International Conference on Polyolefin Characterization (ICPC 2008) CY - Weinheim, Alemania M2 - Valencia, España A1 - Benavente Castro, Mª del Rosario A1 - Polo-Corpa, M.J. A1 - Pérez Tabernero, Ernesto A1 - Lorenzo Esteban, Vicente ER -