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Moisture Effect on Mechanical Properties of Graphene/Epoxy Nanocomposites

Published online by Cambridge University Press:  16 March 2016

H.-K. Liu ,
Y.-C. Wang  and
T.-H. Huang
H.-K. Liu*
Affiliation:
Department of Mechanical and Computer Aided EngineeringFeng-Chia UniversityTaichung, Taiwan
Y.-C. Wang
Affiliation:
Material and Chemical Research LaboratoriesIndustrial technology Research InstituteHsinchu, Taiwan
T.-H. Huang
Affiliation:
Department of Mechanical and Computer Aided EngineeringFeng-Chia UniversityTaichung, Taiwan
*
*Corresponding author (hkliu@fcu.edu.tw)
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Abstract

2-D graphene nanosheets (GNS) not only have superior mechanical properties, but stacking of GNS in composites is expected to inhibit moisture absorption. In this paper, moisture effect on tensile strength of graphene/epoxy nanocomposites is investigated. Two kinds of graphene reinforcements are used including graphene oxide (GO) and reduced graphene oxide (RGO) with reinforcement weight fraction WGO or WRGO in the range of 0.5 to 3.0wt%. A dispersion agent acetone is added in nanocomposites to enhance graphene dispersion. To evaluate moisture influence, those nanocomposites are soaked in two kinds of liquid including deionized water (DIW) and salt water (saline solution) for seven kinds of soaking periods of time including 24, 48, 72, 100, 400 hours, 30 days, and 60 days. After soaking test, diffusion coefficients of various composites are evaluated; besides tensile strengths of composites are measured by microforce testing machine. In order to correlate the strength with microstructure evolution, several techniques are adopted to analyze morphologies and functionalities of reinforcements and fracture surface of composites. They include Raman spectroscope, X-ray photoelectron spectroscope, and SEM. 2-D GNS are found to effectively enhance nanocomposites by moisture attack, and their corresponding reinforcing mechanisms are proposed.

Keywords

NanocompositeMoistureDiffusionFunctionalities
Type
Research Article
Information
Journal of Mechanics , Volume 32 , Issue 6 , December 2016 , pp. 673 - 682
Copyright
Copyright © The Society of Theoretical and Applied Mechanics 2016 

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