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Non-Isothermal Crystallization Kinetic of Polyethylene/Carbon Nanotubes Nanocomposites Using an Isoconversional Method

Technological Institute of Aeronautics, Division of Fundamental Sciences, Laboratory of Plasmas and Process, São José dos Campos, SP 12.228-900, Brazil
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J. Compos. Sci. 2019, 3(1), 21; https://doi.org/10.3390/jcs3010021
Received: 30 January 2019 / Revised: 13 February 2019 / Accepted: 14 February 2019 / Published: 18 February 2019
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Abstract

Behavior studies of thermoplastic polymers during non-isothermal crystallization are extremely important since most of their properties are influenced by degree of crystallinity and the crystallization process. In general, an approach based on a model-fitting method is used to perform crystallization kinetic studies. Due to their inability to uniquely determine the reaction mode, many studies have used the isoconversional method, where it is not necessary to assume a crystallization model to obtain the kinetic parameters. Therefore, in this work, the influence of acid and octadecylamine functionalized carbon nanotubes (CNTs) in the crystallization kinetic of polyethylene (PE) was studied using an isoconversional method with differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The kinetic parameters and the crystallization model were determined. The incorporation of functionalized and non-functionalized CNTs into PE did not change the Johnson-Mehl-Avrami crystallization model. However, the CNTs increased the crystallization temperature and reduced the activation energy for crystallization. In addition, the Avrami coefficient values were lower for the nanocomposites when compared to pure PE. The incorporation of CNTs accelerated the crystallization of PE, reducing the crystallite sizes and modifying their morphology. View Full-Text
Keywords: carbon nanotubes; high-density polyethylene; crystallization kinetic; isoconversional method; functionalization carbon nanotubes; high-density polyethylene; crystallization kinetic; isoconversional method; functionalization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Menezes, B.R.C.; Campos, T.M.B.; Montanheiro, T.L.A.; Ribas, R.G.; Cividanes, L.S.; Thim, G.P. Non-Isothermal Crystallization Kinetic of Polyethylene/Carbon Nanotubes Nanocomposites Using an Isoconversional Method. J. Compos. Sci. 2019, 3, 21.

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