Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 116, Issue -, Pages 206-215Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2018.10.035
Keywords
Polymer-matrix composites (PMCs); Graphene; Admicellar polymerization; Thermal conductivity
Funding
- National Research Foundation of Korea (NRF) grant - Korea government (MSIT) [2017R1A2A2A05069858]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korea government Ministry of Trade, Industry and Energy [20184030202070]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20184030202070] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, thermally conductive graphene/epoxy composites were prepared from graphene and coated with polymethyl methacrylate (PMMA) using admicellar polymerization. In this process, the surfactant plays a key role, and two types of ionic surfactants [sodium dodecyl sulfate (SDS) and, cetyltrimethylammoniurn bromide (CTAB)] were used. PMMA-functionalized graphenes using SDS (S-PfRG) and CTAB (C-PfRG) were prepared as fillers, and PMMA was coated on the graphene in different forms). Both S-PfRG and C-PfRG were fabricated into epoxy composites showing different thermal conductivities. In the S-PfRG/epoxy composites, S-PfRG improved the interfacial adhesion between the filler and matrix, but because of the coating of PMMA, graphene was presented in an aggregated form. However, the C-PfRG/epoxy composite exhibited not only good interfacial adhesion but also well-dispersed graphene in the matrix. As a result, the thermal conductivity was increased to 0.670 W/mK, which was a 403% increase when compared to that of the untreated graphene/epoxy composite.
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