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Epoxy/graphene platelets nanocomposites with two levels of interface strength

Zaman, Izzuddin and Phan, Tam Thanh and Kuan, Hsu-Chiang and Meng, Qingshi and La, Ly Truc Bao and Luong, Lee and Youssf, Osama and Ma, Jun (2011) Epoxy/graphene platelets nanocomposites with two levels of interface strength. Polymer, 52 (7). pp. 1603-1611. ISSN 0032-3861

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Abstract

Graphene platelets (GP) are a novel class of nanofillers due to its good compatibility with most polymers, high aspect ratio, high absolute strength and cost-effectiveness. We in this study synthesised two types of epoxy/GP nanocomposites with different interface strength using the combination of sonication and chemical modification. Although the surface-modified graphene platelets (m-GP) formed clusters, a higher degree of dispersion and exfoliation of graphene was observed in each cluster owning to the improved interface by modification. The scrolling of graphene was found predominantly in the interface- modified nanocomposite. At 4 wt%, the modified nanocomposite shows fracture energy release rate G1c 613.4 J m-2 while the unmodified nanocomposite indicates 417.3 J m-2, in comparison with neat epoxy G1c 204.2 J m-2. The interface modification enhanced the glass transition temperature of neat epoxy from 94.7 to 108.6 °C, 14.7% increment. Toughening mechanisms are attributed to the voiding, microcracking and breakage of GP, while matrix may not consume as much fracture energy as m-GP do.

Item Type: Article
Uncontrolled Keywords: graphene; interface; toughening
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Engineering Mechanics
Depositing User: Dr Izzuddin Zaman
Date Deposited: 08 Dec 2014 06:38
Last Modified: 08 Dec 2014 06:38
URI: http://eprints.uthm.edu.my/id/eprint/6232
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