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.
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Reyes-de Vaaben, S., Aguilar, A., Avalos, F. et al. Carbon nanoparticles as effective nucleating agents for polypropylene. J Therm Anal Calorim 93, 947–952 (2008). https://doi.org/10.1007/s10973-007-8591-9
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DOI: https://doi.org/10.1007/s10973-007-8591-9