Improving the Tribological and Anticorrosion Performance of Waterborne Polyurethane Coating by the Synergistic Effect between Modified Graphene Oxide and Polytetrafluoroethylene

Bai, Tao; Lv, Lei; Du, Wenfeng; Fang, Wenqi; Wang, Yansong

doi:10.3390/nano10010137

Cited by 36 publications

(16 citation statements)

References 26 publications

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“…Zhang et al [ 17 ] have also shown that the addition of triethylene tetramine + polyethylene glycol diglycidyl ether functionalized GO enhanced the water resistance, the thermal stability, and the mechanical properties of PUDs. Furthermore, different GO derivatives have been used to improve the anticorrosive properties of coatings made from PUDs [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Surface Chemistry of Graphene Oxide on the Structure–Property Relationship of Waterborne Poly(urethane urea) Adhesive

Tounici

Martı́n-Martı́nez

2021

Materials

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Small amounts—0.04 wt.%—graphene oxide derivatives with different surface chemistry (graphene oxide—GO-, amine-functionalized GO—A-GO-, reduced GO—r-GO) were added during prepolymer formation in the synthesis of waterborne poly(urethane urea) dispersions (PUDs). Covalent interactions between the surface groups on the graphene oxide derivatives and the end NCO groups of the prepolymer were created, these interactions differently altered the degree of micro-phase separation of the PUDs and their structure–properties relationships. The amine functional groups on the A-GO surface reacted preferentially with the prepolymer, producing new urea hard domains and higher percentage of soft segments than in the PUD without GO derivative. All GO derivatives were well dispersed into the PU matrix. The PUD without GO derivative showed the most noticeable shear thinning and the addition of the GO derivative reduced the extent of shear thinning differently depending on its functional chemistry. The free urethane groups were dominant in all PUs and the addition of the GO derivative increased the percentage of the associated by hydrogen bond urethane groups. As a consequence, the addition of GO derivative caused a lower degree of micro-phase separation. All PUs containing GO derivatives exhibited an additional thermal decomposition at 190–206 °C which was ascribed to the GO derivative-poly(urethane urea) interactions, the lowest temperature corresponded to PU+A-GO. The PUs exhibited two structural relaxations, their temperatures decreased by adding the GO derivative, and the values of the maximum of tan delta in PU+r-GO and PU+A-GO were significantly higher than in the rest. The addition of the GO derivative increased the elongation-at-break, imparted some toughening, and increased the adhesion of the PUD. The highest T-peel strength values corresponded to the joints made with PUD+GO and PUD+r-GO, and a rupture of the substrate was obtained.

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Section: Introductionmentioning

confidence: 99%

Influence of the Surface Chemistry of Graphene Oxide on the Structure–Property Relationship of Waterborne Poly(urethane urea) Adhesive

Tounici

Martı́n-Martı́nez

2021

Materials

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“… 4 − 6 Among various polymers, WPU has a wide range of applications in the friction field because of its excellent mechanical properties, easy modification, environmental protection, and no pollution. 7 − 9 However, pure WPU cannot meet the requirements of antifriction and wear resistance under high-strength conditions. The tribological properties of the polymer can be improved by adding lubricants such as molybdenum disulfide, 10 , 11 graphite, 12 and polytetrafluoroethylene.…”

Section: Introductionmentioning

confidence: 99%

Tribological Performance Studies of Waterborne Polyurethane Coatings with Aligned Modified Graphene Oxide@Fe₃O₄

et al. 2021

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In this study, the chemical graft method was used to connect modified graphene oxide (GO) and Fe 3 O 4 through covalent bonds. To make full use of the tribological properties of graphene, aligned graphene oxide@Fe 3 O 4 /waterborne polyurethane (GO@Fe 3 O 4 /WPU) was prepared in a magnetic field and tribological experiments were carried out on it. The GO@Fe 3 O 4 was characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and a transmission electron microscopy (TEM). The characterization results show that Fe 3 O 4 is successfully loaded on the surface of GO and GO@Fe 3 O 4 has better dispersibility in WPU. Among the coatings without alignment inducement of GO@Fe 3 O 4 , 0.5 wt % GO@Fe 3 O 4 /WPU has the lowest friction coefficient and wear rate. In addition, the 0.5 wt % aligned GO@Fe 3 O 4 /WPU composite coating has the lowest friction coefficient and wear rate compared with nonaligned and pure WPU coatings. The excellent tribological properties of the aligned composite coating come from its ability to quickly form a uniform and continuous transfer film on the friction counterpair, which avoids direct friction between the friction counterpair and the coating.

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“…[1][2][3][4] So GO is widely used as a filler in polymer-based composites to improve the dielectric properties, [5,6] mechanical properties, [7][8][9] and anticorrosive properties. [10,11] However, due to the strong van der Waals force between the GO nanosheets; moreover, graphene-based nanocomposites are usually fabricated by the method of solution casting, it is difficult to uniformly disperse GO in polymers, especially in non-polar polymers. Generally, a good dispersion of GO within the polymer matrix is necessary to improve the properties of composites.…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide grafted with polydimethylsiloxane modified polyurethane

et al. 2021

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In order to improve the dispersion of graphene oxide (GO) in polymers, we synthesized polyurethane (PU) chains with long polydimethylsiloxane (PDMS) chains as the "soft segment" and hexamethylene diisocyanate (HDI) as the "hard segment", then the PU chains were grafted onto GO. The results of compatibility in solvents and TEM images of composites indicated that the modified GO (GO-PU) would present two different shapes in non-polar and polar solvents (cocoonlike shape and stretched shape, respectively). The two shapes made it have a good dispersion in both non-polar and polar polymers, it was expected to be applied in both non-polar and polar polymer matrixes. This provided a method for covalent modification of GO.

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Improving the Tribological and Anticorrosion Performance of Waterborne Polyurethane Coating by the Synergistic Effect between Modified Graphene Oxide and Polytetrafluoroethylene

Cited by 36 publications

References 26 publications

Influence of the Surface Chemistry of Graphene Oxide on the Structure–Property Relationship of Waterborne Poly(urethane urea) Adhesive

Influence of the Surface Chemistry of Graphene Oxide on the Structure–Property Relationship of Waterborne Poly(urethane urea) Adhesive

Tribological Performance Studies of Waterborne Polyurethane Coatings with Aligned Modified Graphene Oxide@Fe₃O₄

Graphene oxide grafted with polydimethylsiloxane modified polyurethane

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Improving the Tribological and Anticorrosion Performance of Waterborne Polyurethane Coating by the Synergistic Effect between Modified Graphene Oxide and Polytetrafluoroethylene

Cited by 36 publications

References 26 publications

Influence of the Surface Chemistry of Graphene Oxide on the Structure–Property Relationship of Waterborne Poly(urethane urea) Adhesive

Influence of the Surface Chemistry of Graphene Oxide on the Structure–Property Relationship of Waterborne Poly(urethane urea) Adhesive

Tribological Performance Studies of Waterborne Polyurethane Coatings with Aligned Modified Graphene Oxide@Fe3O4

Graphene oxide grafted with polydimethylsiloxane modified polyurethane

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Product

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Tribological Performance Studies of Waterborne Polyurethane Coatings with Aligned Modified Graphene Oxide@Fe₃O₄