Preparation of graphene oxide/epoxy nanocomposites with significantly improved mechanical properties | Zendy

Dilini Galpaya | Zendy; Mingchao Wang | Zendy; Graeme A. George | Zendy; Nunzio Motta | Zendy; Eric R. Waclawik | Zendy; Cheng Yan | Zendy

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Preparation of graphene oxide/epoxy nanocomposites with significantly improved mechanical properties

Author(s) -

Dilini Galpaya,

Mingchao Wang,

Graeme A. George,

Nunzio Motta,

Eric R. Waclawik,

Cheng Yan

Publication year - 2014

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.4892089

Subject(s) - epoxy , diglycidyl ether , materials science , composite material , glass transition , graphene , nanocomposite , oxide , curing (chemistry) , fracture toughness , dynamic mechanical analysis , differential scanning calorimetry , triethylenetetramine , polymer , bisphenol a , chemistry , nanotechnology , organic chemistry , metallurgy , physics , thermodynamics

The effect of graphene oxide (GO) on the mechanical properties and the curing reaction of Diglycidyl Ether of Bisphenol A/F and Triethylenetetramine epoxy system was investigated. GO was prepared by oxidation of graphite flakes and characterized by spectroscopic and microscopic\udtechniques. Epoxy nanocomposites were fabricated with different GO loading by solution mixing technique. It was found that incorporation of small amount of GO into the epoxy matrix significantly enhanced the mechanical properties of the epoxy. In particular, model I fracture\udtoughness was increased by nearly 50% with the addition of 0.1 wt. % GO to epoxy. The toughening mechanism was understood by fractography analysis of the tested samples. The more irregular, coarse, and multi-plane fracture surfaces of the epoxy/GO nanocomposites were observed. This implies that the two-dimensional GO sheets effectively disturbed and deflected the crack propagation. At 0.5 wt. % GO, elastic modulus was ~35% greater than neat epoxy.\udDifferential scanning calorimetry (DSC) results showed that GO addition moderately affect the glass transition temperature (Tg) of epoxy. The maximum decrease of Tg by ~7 oC was shown for the nanocomposite with 0.5 wt. % GO. DSC results further revealed that GO significantly hindered\udthe cure reaction in the epoxy system

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