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Development of polymer composites using modified, high-structural integrity graphene platelets

Ma, Jun and Meng, Qingshi and Zaman, Izzuddin and Zhu, Shenmin and Michelmore, Andrew and Nobuyuki, Kawashima and Wang, Chun H. and Kuan, Hsu-Chiang (2014) Development of polymer composites using modified, high-structural integrity graphene platelets. Composites Science and Technology, 91. pp. 82-90. ISSN 02663538

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Previous studies on polymer/graphene composites have mainly utilized either reduced graphene oxide or graphite nanoplatelets of over 10 nm in thickness. In this study we covalently modified 3-nm thick graphene platelets (GnPs) by the reaction between the GnPs’ epoxide groups and the end-amine groups of a commercial long-chain surfactant (Mw = 2000), compounded the modified GnPs (m-GnPs) with a model polymer epoxy, and investigated the structure and properties of both m-GnPs and their epoxy composites. A low Raman ID/IG ratio of 0.13 was found for m-GnPs corresponding to high structural integrity. A percolation threshold of electrical conductivity was observed at 0.32 vol% m-GnPs, and the 0.98 vol% m-GnPs improved the Young’s modulus, fracture energy release rate and glass transition temperature of epoxy by 14%, 387% and 13%, respectively. These significantly improved properties are credited to: (i) the low Raman ID/IG ratio of GnPs, maximizing the structural integrity and thus conductivity, stiffness and strength inherited from its sister graphene, (ii) the low thickness of GnPs, minimizing the damaging effect of the poor through-plane mechanical properties and electrical conductivity of graphene, (iii) the high-molecular weight surfactant, leading to uniformly dispersed GnPs in the matrix, and (iv) a covalently bonded interface between m-GnPs and matrix, more effectively transferring load/electron across interface.

Item Type: Article
Uncontrolled Keywords: A. functional composites; A. nano composites; A. nano particles; B. fracture toughness; B. interface; graphene (nominated)
Subjects: T Technology > TP Chemical technology > TP1080-1185 Polymers and polymer manufacture
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Engineering Mechanics
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 31 Dec 2018 07:18
Last Modified: 31 Dec 2018 07:18
URI: http://eprints.uthm.edu.my/id/eprint/10435
Statistic Details: View Download Statistic

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