Graphene Oxide as a Prospective Graft in Polyethylene Glycol for Enhancing the Toughness of Epoxy Nanocomposites

Polyethylene glycol (PEG) was successfully grafted onto the surface of graphene oxide (GO) by the “grafting to” technique. PEG, GO as well as the PEG grafted GO (GO‐g‐PEG) was successfully incorporated into an epoxy matrix and subsequently cured using diethylenetoluenediamine (DETDA) to make epoxy n...

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Bibliographic Details
Published in:Polymer engineering and science 2020-04, Vol.60 (4), p.773-781
Main Authors: Jayan, Jitha S, Saritha, Appukuttan, Deeraj, Battula Durga Siva, Joseph, Kuruvilla
Format: Article
Language:English
Subjects:
Analysis
Epoxy matrix composites
Epoxy resins
Fillers
Fracture toughness
Glycols (Class of compounds)
Grafting
Graphene
Graphite
Homogeneity
Mechanical properties
Nanocomposites
Polyethylene glycol
Polymers
Polyols
Rheological properties
Rheology
Thermal stability
Time
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Summary:Polyethylene glycol (PEG) was successfully grafted onto the surface of graphene oxide (GO) by the “grafting to” technique. PEG, GO as well as the PEG grafted GO (GO‐g‐PEG) was successfully incorporated into an epoxy matrix and subsequently cured using diethylenetoluenediamine (DETDA) to make epoxy nanocomposites. Mechanical, thermal, and rheological properties of the epoxy nanocomposites were studied to check the effectiveness of these fillers in the epoxy matrix. An improvement of 255% and 334% at a very low filler loading of about 0.1 wt% was observed in the fracture toughness of GO and GO‐g‐PEG loaded systems versus the neat epoxy. Toughening mechanisms are also explained by analyzing SEM images of the fractured surface. Modeling of rheological properties was carried out by following time‐independent Newtonian model. The homogeneity of the epoxy filler systems are explained with the help of Cole–Cole plots. The thermal stability of the filler loaded epoxy composites was examined in detail by TGA. Improvements in mechanical properties reveal the potential benefit of the grafting process in epoxy toughening. POLYM. ENG. SCI., 60:773–781, 2020. © 2020 Society of Plastics Engineers
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.25335