Print Email Facebook Twitter High-Strength Liquid Crystal Polymer-Graphene Oxide Nanocomposites from Water Title High-Strength Liquid Crystal Polymer-Graphene Oxide Nanocomposites from Water Author Fox, Ryan J. (University of North Carolina) Hegde, Maruti (University of North Carolina) Cole, Daniel P. (US Army DEVCOM, Moffett Field) Moore, Robert B. (Macromolecules Innovation Institute, Virginia) Picken, S.J. (TU Delft ChemE/Advanced Soft Matter) Dingemans, T.J. (TU Delft Novel Aerospace Materials; University of North Carolina) Date 2022 Abstract We report on the morphology and mechanical properties of nanocomposite films derived from aqueous, hybrid liquid crystalline mixtures of rodlike aggregates of a sulfonated, all-aromatic polyamide, poly(2,2′-disulfonyl-4,4′-benzidine terephthalamide) (PBDT), and graphene oxide (GO) platelets. An isothermal step at 200 °C facilitates in situ partial thermal reduction of GO to reduced GO (rGO) in nanocomposite films. X-ray scattering studies reveal that PBDT-rGO nanocomposites exhibit both higher in-plane alignment of PBDT (the order parameter increases from 0.79 to 0.9 at 1.8 vol % rGO) and alignment along the casting direction (from 0.1 to 0.6 at 1.8 vol % rGO). From dynamic mechanical thermal analysis, the interaction between PBDT and rGO causes the β-relaxation activation energy for PBDT to increase with rGO concentration. Modulus mapping of nanocomposites using atomic force microscopy demonstrates enhanced local stiffness, indicating reinforcement. From stress-strain analysis, the average Young's modulus increases from 16 to 37 GPa at 1.8 vol % rGO and the average tensile strength increases from 210 to 640 MPa. Despite polymer alignment along the casting direction, an average transverse tensile strength of 230 MPa is obtained. Subject graphene oxidehybrid liquid crystalmechanical reinforcementnanocompositereduced graphene oxide To reference this document use: http://resolver.tudelft.nl/uuid:31eea64d-f99a-446e-a9cf-37670909fbbf DOI https://doi.org/10.1021/acsami.2c00186 Embargo date 2023-07-01 ISSN 1944-8244 Source ACS applied materials & interfaces, 14 (14), 16592-16600 Bibliographical note Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2022 Ryan J. Fox, Maruti Hegde, Daniel P. Cole, Robert B. Moore, S.J. Picken, T.J. Dingemans Files PDF acsami.2c00186.pdf 5.3 MB Close viewer /islandora/object/uuid:31eea64d-f99a-446e-a9cf-37670909fbbf/datastream/OBJ/view