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Novel hydroxylated boron nitride functionalized p-phenylenediamine-grafted graphene: An excellent filler for enhancing the barrier properties of polyurethane

Abstract

The hydroxylated boron nitride (BN(OH)x) functionalized p-phenylenediamine modified reduced graphene oxide (rGO) filler (BN(OH)x-PrGO) is prepared for the first time using a facile and novel strategy. The BN(OH)x-PrGO/polyurethane (PU) composite films are prepared using different filler loadings via a solution casting technique. The BN(OH)x-rGO/PU and BN(OH)x/PU composite films are also prepared in order to compare the reinforcing effects of different fillers. The FESEM and TEM analyses show excellent dispersion and compatibility of BN(OH)x-PrGO in PU matrix. The tensile strength and modulus of the composite film show 62% and 95% enhancement, respectively, following the inclusion of 3 wt% BN(OH)x-PrGO compared to the pure PU film. The BN(OH)x-PrGO/PU composite films exhibit outstanding oxygen gas barrier, ideal dielectric properties, and excellent anti-corrosion performances. In particular, the 3BN(OH)x-PrGO/PU film shows nearly 91% reduction in O2 transmission rate compared to the PU film. The permeability of the O2 through the composite film is correlated with the diffusivity, solubility and Bharadwaj model. The dielectric constant (at 103 Hz) increases from 6.8 of pure PU film to 13.1 of 3BN(OH)x-PrGO/PU composite, and dielectric loss also remains low for the composite. The potentiodynamic polarization curve shows a substantial shift of corrosion potential of 3BN(OH)x-PrGO/PU-coated steel towards the anodic direction than the PU, and it exhibits ultralow corrosion rate (6.14×10-5 mm/year) and excellent corrosion inhibition efficiency (99.96%) in the saline solution.

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Publication details

The article was received on 28 Aug 2018, accepted on 08 Oct 2018 and first published on 09 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA08351G
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Novel hydroxylated boron nitride functionalized p-phenylenediamine-grafted graphene: An excellent filler for enhancing the barrier properties of polyurethane

    X. Li , P. Bandyopadhyay, T. Kshetri, N. H. Kim and J. H. Lee, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08351G

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