Synthesis,mechanical, and barrier properties of LDPE/graphene nanocomposites using vinyl triethoxysilane as a coupling agent |
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Authors: | Jingchao Wang Chunhui Xu Huating Hu Li Wan Rong Chen Han Zheng Fangming Liu Min Zhang Xiaopeng Shang Xianbao Wang |
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Institution: | (1) Ministry of Education, Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Wuhan, 430062, People’s Republic of China;(2) Faculty of Materials Science and Engineering, Hubei University, Wuhan, 430062, People’s Republic of China |
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Abstract: | Precise interface control and dispersal of graphene nanosheets in polymer hosts are challenging to develop high performance
graphene-based nanocomposites due to their strong interlayer cohesive energy and surface inertia. Here, we firstly report
an efficient and novel method to functionalize graphene nanosheets with vinyl triethoxysilane (VTES) and successfully blend
them with low density polyethylene (LDPE) to prepare nanocomposites. Fourier transforms infrared spectra (FTIR), Raman spectra,
and thermogravimetric analysis (TGA) proved that the graphene sheets were covalently bonded with VTES. The resulting nanocomposites
obtained the increases of up to 27.0 and 92.8% in the tensile strength and Young’s modulus, respectively, compared to neat
LDPE. The VTES–graphene not only remarkably improved the tensile strength of the composites, but also enhanced its toughness
by 17.7%. Oil permeability measurements showed that the absorption ratio of toluene by the LDPE/graphene composites decreased
from 56 to 39%, and its barrier properties have obviously been improved. This study opens a new route to optimize interface
structures and improve the comprehensive performances of graphene–polymer nanocomposites. |
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