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Title: Thermal degradation kinetics and modeling study of ultra high molecular weight polyethylene (Uhmwp)/graphene nanocomposite
Authors: Jafari, Iman
Shakiba, Mohamadreza
Khosravi, Fatemeh
Ramakrishna, Seeram 
Abasi, Ehsan
Teo, Ying Shen
Kalaee, Mohammadreza
Abdouss, Majid
Ahmad Ramazani, S.A.
Moradi, Omid
Ghomi, Erfan Rezvani
Keywords: Graphene
Thermal degradation
Thermal properties
Ultra-high molecular weight polyethylene
Issue Date: 13-Mar-2021
Publisher: MDPI AG
Citation: Jafari, Iman, Shakiba, Mohamadreza, Khosravi, Fatemeh, Ramakrishna, Seeram, Abasi, Ehsan, Teo, Ying Shen, Kalaee, Mohammadreza, Abdouss, Majid, Ahmad Ramazani, S.A., Moradi, Omid, Ghomi, Erfan Rezvani (2021-03-13). Thermal degradation kinetics and modeling study of ultra high molecular weight polyethylene (Uhmwp)/graphene nanocomposite. Molecules 26 (6) : 1597. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: The incorporation of nanofillers such as graphene into polymers has shown significant improvements in mechanical characteristics, thermal stability, and conductivity of resulting polymeric nanocomposites. To this aim, the influence of incorporation of graphene nanosheets into ultra-high molecular weight polyethylene (UHMWPE) on the thermal behavior and degradation kinetics of UHMWPE/graphene nanocomposites was investigated. Scanning electron microscopy (SEM) analysis revealed that graphene nanosheets were uniformly spread throughout the UHMWPE’s molecular chains. X-Ray Diffraction (XRD) data posited that the morphology of dispersed graphene sheets in UHMWPE was exfoliated. Non-isothermal differential scanning calorimetry (DSC) studies identified a more pronounced increase in melting temperatures and latent heat of fusions in nanocomposites compared to UHMWPE at lower concentrations of graphene. Thermogravimetric analysis (TGA) and derivative thermogravimetric (DTG) revealed that UHMWPE’s thermal stability has been improved via incorporating graphene nanosheets. Further, degradation kinetics of neat polymer and nanocomposites have been modeled using equations such as Friedman, Ozawa–Flynn–Wall (OFW), Kissinger, and Augis and Bennett’s. The "Model-Fitting Method” showed that the auto-catalytic nth-order mechanism provided a highly consistent and appropriate fit to describe the degradation mechanism of UHMWPE and its graphene nanocomposites. In addition, the calculated activation energy (Ea ) of thermal degradation was enhanced by an increase in graphene concentration up to 2.1 wt.%, followed by a decrease in higher graphene content. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Source Title: Molecules
ISSN: 1420-3049
DOI: 10.3390/molecules26061597
Rights: Attribution 4.0 International
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