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Crystallization Kinetics in Isotactic Polypropylene Films with Carbon Nanotubes

Published online by Cambridge University Press:  01 February 2011

Georgi Georgiev ,
Scott Schoen ,
Devin Ivy ,
Lauren Wielgus ,
Yaniel Cabrera  and
Peggy Cebe
Georgi Georgiev
Affiliation:
Department of Natural Sciences, Assumption College, Worcester, MA 01609 Department of Physics and Astronomy, Tufts University, Medford, MA 02155
Scott Schoen
Affiliation:
Department of Physics and Astronomy, Tufts University, Medford, MA 02155
Devin Ivy
Affiliation:
Department of Physics and Astronomy, Tufts University, Medford, MA 02155
Lauren Wielgus
Affiliation:
Department of Physics and Astronomy, Tufts University, Medford, MA 02155
Yaniel Cabrera
Affiliation:
Department of Physics and Astronomy, Tufts University, Medford, MA 02155
Peggy Cebe
Affiliation:
Department of Physics and Astronomy, Tufts University, Medford, MA 02155
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Abstract

Polymer nanocomposites are the largest commercial application for carbon nanotubes (CNTs) which determines the interest in their effect on crystallization processes of polymers. We chose Isotactic Polypropylene (iPP) as one of the most widely used polymers. Nanocomposites with multiwall carbon nanotubes (MWCNTs) 0-5% by weight were studied, using differential scanning Calorimetry to measure the crystal nucleation and kinetics effects of MWCNTs. Isothermal crystallization at 138°C was performed and the data were analyzed using Avrami analysis. We obtained results for the effect of MWCNTs on the crystallization kinetics. The Avrami analysis showed a dramatic increase in the crystallization rate constant and constancy of the Avrami exponent with increase of the CNTs concentration. The full width at half maximum (FWHM) of the heat flow exotherm and the peak time for crystallization (tp) change dramatically. The crystallinity shows a slight variation with the CNTs concentration dipping at 2% CNTs which can be explored further at higher concentrations.

Keywords

polymerkineticscrystal
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1312: Symposium HH/II/JJ – Polymer-Based Materials and Composites—Synthesis, Assembly and Applications , 2011 , mrsf10-1312-jj05-36
Copyright
Copyright © Materials Research Society 2011

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