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Reinforcing effect of amine‐functionalized and carboxylated porous graphene on toughness, thermal stability, and electrical conductivity of epoxy‐based nanocomposites
Author(s) -
Naderi Mehdi,
Ebrahimi Farnaz,
Najafi Mohammad,
Naderi Hamed
Publication year - 2019
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.47475
Subject(s) - epoxy , materials science , nanocomposite , graphene , thermal stability , composite material , nanomaterials , surface modification , glass transition , fracture toughness , toughness , percolation threshold , scanning electron microscope , polymer , electrical resistivity and conductivity , chemical engineering , nanotechnology , electrical engineering , engineering
Epoxy‐based nanocomposites reinforced with nonfunctionalized porous graphene (NPG), carboxylated porous graphene (CNPG), and amine‐functionalized porous graphene (ANPG) were investigated with regard to mechanical properties, thermal stability, and electrical conductivity. Nanomaterials were added to the epoxy matrix in varying contents of 0.5, 1, and 2 wt %. Generally, mechanical properties were improved as a result of introducing nanomaterials into the epoxy resin. However, the amelioration of toughness was only observed in functionalized NPGs/epoxy nanocomposites. Field emission scanning electron microscopy images showed that functionalized nanomaterials induced a rougher fracture surface compared to the neat epoxy. Dynamic mechanical analysis along with differential scanning calorimetry confirmed an increment in the glass‐transition temperature ( T g ) of the reinforced nanocomposites. Also, they proved that functionalization made the epoxy network tougher and more flexible. The electrical conductivity and thermal stability of the epoxy resin were also improved when loaded with nanomaterials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47475.