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Highly branched Graphene Siloxane−Polyurethane-Urea (PU-urea) Hybrid Coatings

Here, we report the development of waterborne hybrid coatings containing Sisingle bondOsingle bondSi and Sisingle bondOsingle bondC groups were obtained by using amino functionalized chemically reduced graphene nanoparticles (APTES-CRG), amino functionalized Zinc Oxide nanoparticles (APTES-ZnO), isophorone di-isocyanate (IPDI), polyether polyol (PTMG1000), and dimethylol propionic acid (bis-MPA) as main materials. The test results indicated that the siloxane network was developed during the functionalization reaction and film curing. The effects of APTES-ZnO and APTES-CRG content on the properties of the films were studied. The morphology results from TEM analysis show that APTES-ZnO and APTES-CRG nanoparticles were homogeneously distributed in waterborne hybrid coatings. The tensile strength increases from 9.6 MPa to 15.8 MPa when the APTE-ZnO content increases from 0% to 15% and from 9.6 MPa to 20.3 MPa when the APTE-CRG content increases from 0% to 15%. TGA analysis indicates that the APTES-ZnO and APTES-CRG improves the thermal stability of the coatings. Conductivity of the graphene hybrid coatings was measured by two probe methods showed 1.34 × 10–8 S/cm, which is 10 orders of magnitude higher than that of WPU base (2.37 × 10–18 S/cm) (insulator level, < 10–12 S/cm).

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Volume 111, October 2017, Pages 343–353

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