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

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 crystallizatio...

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Bibliographic Details
Published in:Journal of composites science 2019, Vol.3 (1), p.21
Main Authors: Menezes, Beatriz, Campos, Tiago, Montanheiro, Thais, Ribas, Renata, Cividanes, Luciana, Thim, Gilmar
Format: Article
Language:English
Subjects:
Carbon
Carbon nanotubes
Chemical compounds
Crystallites
Crystallization
crystallization kinetic
Degree of crystallinity
functionalization
Graphene
High density polyethylenes
high-density polyethylene
isoconversional method
Kinetics
Low density polyethylenes
Mathematical models
Morphology
Nanocomposites
Nanoparticles
Optical microscopy
Parameters
Polyethylene
Polyethylenes
Polymerization
Polymers
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Summary: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.
ISSN:2504-477X
2504-477X
DOI:10.3390/jcs3010021