Application of different macrokinetic models to the isothermal crystallization of PP/talc blends |
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Authors: | Carmen Albano, Jos Papa, Miren Ichazo, Jeanette Gonz lez,Carmen Ustariz |
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Affiliation: | a Lab. De Polímeros, Centro de Química, Instituto Venezolano de Investigaciones Científicas (IVIC), Apartado. 21827, Caracas 1020-A, Venezuela b Facultad de Ingeniería, Universidad Central de Venezuela, Escuela de Ingeniería Química, Caracas, Venezuela c Departamento de Mecánica, Universidad Simón Bolívar, Caracas, Venezuela |
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Abstract: | The crystallization kinetics of neat polypropylene (PP) and of PP composites containing 2, 5, 10 and 30 wt% of talc was studied. Various kinetic equations, namely the Avrami, Velisaris–Seferis, Dietz, Khanna, Malkin models, have been applied to describe the kinetics of crystallization from the melt state under isothermal conditions. The results suggested that experimental data of the Avrami’s exponent, “n”, is approximately 2, meaning that the crystallization of PP alone and of its composites with talc is a two-dimensional growth process. Experimental data of PP alone can be best described by the Avrami, Velisaris–Seferis, Dietz and Malkin models; whereas the models that in the case of composites better correlate their behavior are those of Velisaris–Seferis, followed by Avrami’s. |
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Keywords: | Polypropylene Solidification process Crystallinity Kinetic models Crystallization profiles |
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