Effect of a novel green modification of alumina nanoparticles on the curing kinetics and electrical insulation properties of epoxy composites

A novel green surface modification was successfully implemented on alumina nanoparticles using chitosan (CS) to prevent nanoparticles' aggregation. To evaluate the surface changes of nanoparticles, FTIR, TGA, TEM, and SEM analyses were used. The cure kinetics of the uncured samples was analyzed...

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Bibliographic Details
Published in:Polymers for advanced technologies 2022-01, Vol.33 (1), p.49-65
Main Authors: Mousavi, Seyed Rasoul, Estaji, Sara, Rostami, Elham, Khonakdar, Hossein Ali, Arjmand, Mohammad
Format: Article
Language:English
Subjects:
Activation energy
Alumina
Aluminum oxide
Chitosan
cure kinetics
Curing
Electrical insulation
electrical insulation properties
epoxy resin
Glass transition temperature
Medicin och hälsovetenskap
Nanoparticles
Reaction kinetics
surface modification
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Summary:A novel green surface modification was successfully implemented on alumina nanoparticles using chitosan (CS) to prevent nanoparticles' aggregation. To evaluate the surface changes of nanoparticles, FTIR, TGA, TEM, and SEM analyses were used. The cure kinetics of the uncured samples was analyzed by DSC. Different methods such as KAS, Friedman, Starink, and FWO were applied to measure the activation energy. The activation energy of epoxy reinforced with chitosan‐functionalized alumina (epoxy/[CS‐EPO‐alumina]) was less than that of epoxy reinforced with alumina (epoxy/alumina), which was a confirmation of the positive effect of CS on curing reaction kinetics. Using the Malek method, the Sestak‐Berggren autocatalytic equation was chosen to investigate the cure kinetics of the epoxy. It was found that the Sestak‐Berggren equation is well matched with the experimental data and the model was suitable to predict the epoxy curing reaction reliably. Moreover, the glass transition temperatures of all samples were approximately the same. The effect of surface modification of alumina on the electrical insulating behavior of epoxy was also studied. It was found that CS functionalized alumina (CS‐EPO‐alumina) increased volume resistivity of epoxy at a temperature range of 30 to 80°C more than that of alumina. Electric stability and breakdown strength of epoxy/alumina and epoxy/(CS‐EPO‐alumina) also enhanced, where epoxy/(CS‐EPO‐alumina) experienced a further increase compared to epoxy.
ISSN:1042-7147
1099-1581
DOI:10.1002/pat.5490