Lai C.-L.Fu Y.-J.Chen J.-T.Wang D.-M.Sun Y.-M.Huang S.-H.Hung W.-S.Hu C.-C.Lee K.-R.2019-05-032019-05-03201500086223https://scholars.lib.ntu.edu.tw/handle/123456789/406349This study fabricates a transparent cyclic olefin copolymer (COC)/thermally reduced graphene oxide (TRGO) composite film with low content of TRGO, which exhibits high water vapor barrier properties. With only 0.06 wt% (0.028 vol%) TRGO, the COC/TRGO composite film reduces the water vapor permeability by ?21%. The amount of TRGO in this work is 10-100 times lower than that in other polymer/clay or polymer/graphene composites that reduce the water vapor permeability at the same percentage. Low TRGO content has benefits of fabricating a film with low cost, high transparency, and truly excellent flexibility. The water vapor permeabilities of COC/TRGO composites are much lower than those predicted by Cussler or Nielsen model because of the significant rigidification of COC chains near TRGOs. The COC/TRGO composite film was annealed at different temperatures and then surface modified with amphiphilic polymer to further improve its barrier performance. By treating the film with 0.06 wt% TRGO, the water vapor permeability is greatly reduced by ?65%. ? 2015 Elsevier Ltd. All rights reserved.journal article10.1016/j.carbon.2015.04.0062-s2.0-84929347199https://www.scopus.com/inward/record.uri?eid=2-s2.0-84929347199&doi=10.1016%2fj.carbon.2015.04.006&partnerID=40&md5=7170215355c13f06c5d04105fa02d886