Carbon nanoparticles as effective nucleating agents for polypropylene |
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| Authors: | S Reyes-de Vaaben A Aguilar F Avalos L F Ramos-de Valle |
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| Institution: | (1) Universidad Autónoma de Coahuila, Facultad de Ciencias Químicas, Blvd. V. Carranza and Glz. Lobo, 25000 Saltillo Coahuila, Mexico;(2) Centro de Investigación en Química Aplicada (CIQA), Blvd. E. Reyna #140, 25253 Saltillo Coahuila, Saltillo Coahuila, Mexico |
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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. Avrami?s 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. |
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| Keywords: | carbon nanofibers carbon nanotubes dimethyl-benzylidene sorbitol isothermal kinetics lithium benzoate nucleating agents polypropylene |
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