Nucleating Effect and Dynamic Crystallization of a Poly(propylene)/Talc System |
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Authors: | de Medeiros E S Tocchetto R S de Carvalho L H Santos I M G Souza A G |
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Institution: | (1) Departamento de Engenharia de Materiais, CCT, Universidade Federal da Paraíba, C. P. 10034, 58109-970 Campina Grande, Paraíba, Brazil;(2) Departamento de Química, CCEN, Universidade Federal da Paraíba, 58059-900 Joăo Pessoa, Paraíba, Brazil |
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Abstract: | The addition of nucleating agents to semicrystalline polymersis largely used in the processing industry of plastic materials
to improve some properties of polymers as well as for economical and technological reasons. In this work, the influence of
talc concentration on the nucleation efficiency of poly(propylene) (PP), as well as on the non-isothermal kinetics of the
crystallization of that system were determined by differential scanning calorimetry (DSC). The nucleating efficiency was determined
by Fillon's method, and the dynamic nucleation by Ozawa's method at cooing rates of 2, 5 and 10°C min–1. The results show that both the degree of crystallinity and the crystallization temperature increase with the filler content
and decrease at higher cooling rates and that Ozawa's (n,) exponent and the nucleation efficiency increase with temperature and filler content. It was also shown that the nucleating
efficiency of talc in
poly(propylene) is comparable to the best heterogeneous nucleating agents available.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | DSC dynamic crystallization nucleation poly(propylene) |
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