Journal
APPLIED SURFACE SCIENCE
Volume 464, Issue -, Pages 509-515Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2018.09.086
Keywords
Polyimide; Functionalized graphene oxide; Low temperature imidization; Oxygen barrier; Thermal stability
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Funding
- Korea Institute of Science and Technology (KIST) Institutional Program & Open Research Program
- National Research Foundation (NRF) of Korea - Ministry of Science, ICT and Industrial Fundamental Technology Development Program by the Ministry of Trade, Industry and Energy (MOTIE) of Korea [10052838]
- Space Core Technology Development Program through the National Research Foundation of Korea - Ministry of Science, ICT and Future Planning [NRF-2017M1A3A3A02016310]
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We synthesized methylpiperidine-functionalized graphene oxide (MP-GO) by introducing 4-amino-1-methylpiperidine into reactive epoxy and/or carboxylic acid groups on pristine GO. Then, we applied the MP-GO as a curing catalyst for polyimide (PI) nanocomposites. The MP-GO was found to be an effective base-catalysts for the thermal conversion of polyamic acid (PAA) precursor to PI. Interestingly, when 3 wt% of MP-GO was added to the PI matrix, the complete imidization of nanocomposites was achieved at a temperature lower than 200 degrees C. In addition, the PI/MP-GO nanocomposite films exhibited reinforcement of the oxygen barrier properties which were even better than those of pristine PI, due to the excellent dispersion state of MP-GO and the favorable noncovalent interaction between MP-GO and the PI matrix. Comparison to pristine PI, the oxygen permeability of nanocomposite films that contained only 1 wt% of MP-GO loading was significantly decreased, by about 80%. Furthermore, all the PI/MP-GO nanocomposites exhibited high thermal stability.
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