Article

Journal of Thermal Analysis and Calorimetry

, 93:947

First online:

Carbon nanoparticles as effective nucleating agents for polypropylene

  • S. Reyes-de VaabenAffiliated withUniversidad Autónoma de Coahuila, Facultad de Ciencias Químicas
  • , A. AguilarAffiliated withUniversidad Autónoma de Coahuila, Facultad de Ciencias Químicas
  • , F. AvalosAffiliated withUniversidad Autónoma de Coahuila, Facultad de Ciencias Químicas
  • , L. F. Ramos-de ValleAffiliated withCentro de Investigación en Química Aplicada (CIQA)

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Abstract

The effect of four nucleating agents on the crystallization of isotactic polypropylene (iPP) was studied by differential scanning calorimetry (DSC) under isothermal and non-isothermal conditions. The nucleating agents are: carbon nanofibers (CNF), carbon nanotubes (CNT), lithium benzoate and dimethyl-benzylidene sorbitol.

Avramișs model is used to analyze the isothermal crystallization kinetics of iPP.

Based on the increase in crystallization temperature (T c) and the decrease in half-life time (τ½) for crystallization, the most efficient nucleating agents are the CNF and CNT, at concentrations as low as 0.001 mass%. Sorbitol and lithium benzoate show to be less efficient, while the sorbitol needs to be present at concentrations above 0.05 mass% to even act as nucleating agent.

Keywords

carbon nanofibers carbon nanotubes dimethyl-benzylidene sorbitol isothermal kinetics lithium benzoate nucleating agents polypropylene