The effect of surface chemistry of graphene on rheological and electrical properties of polymethylmethacrylate composites

被引:284
作者
Zhang, Hao-Bin [2 ]
Zheng, Wen-Ge [1 ]
Yan, Qing [1 ]
Jiang, Zhi-Guo [2 ]
Yu, Zhong-Zhen [2 ]
机构
[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo Key Lab Polymer Mat, Div Polymers & Composites, Ningbo 315201, Zhejiang, Peoples R China
[2] Beijing Univ Chem Technol, Coll Mat Sci & Engn, Dept Polymer Engn, State Key Lab Organ Inorgan Composites, Beijing 100029, Peoples R China
基金
中国国家自然科学基金;
关键词
FUNCTIONALIZED GRAPHENE; POLYMER NANOCOMPOSITES; CARBON NANOTUBES; GRAPHITE OXIDE; CONDUCTIVITY; PERCOLATION; REDUCTION; NETWORKS; FATIGUE; SHEETS;
D O I
10.1016/j.carbon.2012.06.052
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Graphene sheets with different oxygen contents were prepared to functionalize the electrically insulating polymethylmethacrylate (PMMA). The influences of surface chemistry of graphene on rheological, electrical and electromagnetic interference (EMI) shielding properties of its PMMA composites were investigated. The appearance of frequency-independent storage modulus at low frequency suggests a solid-like viscoelastic behavior and the formation of an interconnected network of graphene in the matrix. Due to the favorable interfacial interactions arising from polarity matching, the graphene with a C/O ratio of 13.2 (graphene-13.2) shows a better dispersion in PMMA than those with lower C/O ratios, and thus its PMMA composites exhibit lower rheological and electrical percolation thresholds. The EMI shielding properties of the graphene/PMMA composites exhibit similar dependence on the oxygen content of graphene. A high EMI shielding effectiveness of similar to 30 dB was obtained for the PMMA composite with 4.2 vol.% of graphene-13.2 with microwave absorption as the dominant EMI shielding mechanism. (c) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:5117 / 5125
页数:9
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