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The mechanical and thermal properties of graphitic carbon nitride ( g‐C 3 N 4 )‐based epoxy composites
Author(s) -
Baghdadi Yasmine N.,
Sinno Jihad,
Bouhadir Kamal,
Harb Mohammad,
Mustapha Samir,
Patra Digambara,
TehraniBagha Ali R.
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.51324
Subject(s) - materials science , epoxy , composite material , thermogravimetric analysis , scanning electron microscope , ultimate tensile strength , toughness , thermal stability , glass transition , fracture toughness , composite number , dynamic mechanical analysis , polymer , chemical engineering , engineering
Numerous ways to reinforce epoxy resin and improve its thermomechanical properties have been attempted using organic and inorganic nanoparticles. In this paper, graphitic carbon nitride (g‐C 3 N 4 ) nanoparticles were synthesized and used to improve the mechanical properties and thermal stability of epoxy composites. The g‐C 3 N 4 was synthesized from cheap melamine powder using a simple one‐step thermal treatment, then was used to reinforce the resin at different weight percentages (wt%). X‐ray diffraction, scanning electron microscopy (SEM), and Fourier infrared spectroscopy were used to characterize the g‐C 3 N 4 and ensure its successful synthesis by studying the changes in its crystal structure, morphology, and chemical structure. The filler was dispersed in the resin using a combination of ultrasonication and high shear mixing. The results showed that the mechanical properties were optimum when 0.5 wt% g‐C 3 N 4 was used. The tensile strength and fracture toughness of the resulting epoxy composite improved by 21.8% and 77.3%, respectively. SEM was used to investigate the morphologies of cracks formed in epoxy composite specimens after the tensile testing. The SEM micrographs of the fracture surface showed a transition from a brittle to a rough morphology, signifying the enhancement in the composites' toughness. Thermogravimetric analysis showed a good improvement in degradation temperature of up to 8.86% while dynamic mechanical analysis showed that the incorporation of g‐C 3 N 4 did not affect the material's glass transition temperature.