Jin, Jeong-Un Lee, Dong-Hoon Nam, Ki-Ho Yu, Jaesang Kim, Young-Kwan Goh, Munju Kim, Seo Gyun Lee, Heon Sang Ku, Bon-Cheol You, Nam-Ho 2024-01-19T21:02:05Z 2024-01-19T21:02:05Z 2021-09-02 2019-01-15 0169-4332 https://pubs.kist.re.kr/handle/201004/120463 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. English ELSEVIER POLYIMIDE NANOCOMPOSITES MECHANICAL-PROPERTIES IMIDIZATION EPOXY Methylpiperidine-functionalized graphene oxide for efficient curing acceleration and gas barrier of polymer nanocomposites Article 10.1016/j.apsusc.2018.09.086 1 APPLIED SURFACE SCIENCE, v.464, pp.509 - 515 APPLIED SURFACE SCIENCE 464 509 515 scie scopus 000447744200062 2-s2.0-85053417713 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article POLYIMIDE NANOCOMPOSITES MECHANICAL-PROPERTIES IMIDIZATION EPOXY Polyimide Functionalized graphene oxide Low temperature imidization Oxygen barrier Thermal stability