Waterborne polyurethane/graphene oxide-silica nanocomposites with improved mechanical and thermal properties for leather coatings using screen printing

Kale, Manoj B.; Luo, Zhen; Zhang, Xu; Dhamodharan, Duraisami; Divakaran, Nidhin; Mubarak, Suhail; Wu, Lixin

doi:10.1016/j.polymer.2019.02.055

Cited by 90 publications

(36 citation statements)

References 51 publications

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“…Because of its mechanical properties, graphene has been studied as a reinforcing agent in composites with polymeric matrices, such as epoxy [76] or polyurethane [77] resins, as well as in metal matrix composites with magnesium-based metal alloys [78], in order to enhance wear and wet abrasion resistance. The scrub test is one of the most reliable testing procedures for the characterization of the mechanical properties of organic-based composite coatings.…”

Section: Scrub Testmentioning

confidence: 99%

Effects of Graphene-Based Fillers on Cathodic Delamination and Abrasion Resistance of Cataphoretic Organic Coatings

et al. 2020

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This study aims to demonstrate the excellent protective performance of functionalized graphene oxide (fGO) flakes in acrylic cataphoretic coatings. The filler content provides an important contribution in improving the chemical and mechanical resistance of the acrylic matrix. The morphology of the fillers was first investigated by optical and electron microscopy, analysing the distribution of the fGO flakes within the polymer matrix. After that, the flakes were added to the cataphoretic bath in different concentrations, resulting in four series of samples. The cathodic delamination of the coatings was assessed with cathodic polarization cycles and with measurements carried out with a scanning Kelvin probe. Finally, the abrasion resistance at the macroscopic and microscopic level was studied by scrub testing and scratching atomic force microscopy analysis, respectively. The incorporation of fGO at the optimized concentration of 0.2 wt.% greatly increases the cathodic delamination resistance of the acrylic matrix, resulting in an effective barrier against the effects of absorbed aggressive substances. Graphene-based fillers also enhance abrasion resistance, thanks to their high mechanical strength. Thus, this work demonstrates the great protective benefits that can be obtained when using fGO flakes as reinforcing fillers in cataphoretic coatings.

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Section: Scrub Testmentioning

confidence: 99%

Effects of Graphene-Based Fillers on Cathodic Delamination and Abrasion Resistance of Cataphoretic Organic Coatings

et al. 2020

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“…Similarly, the mechanical and thermal properties of waterborne polyurethane coatings modified with cellulose nanocrystals and graphene by using a sol method have been studied by Yang et al [33] improved hardness, abrasion resistance, high thermal conductivity, and adhesion. Kale et al [34] mixed a commercial waterborne polyurethane with 0.2 wt % graphene oxide and silica nanocomposites intended for leather coatings and improved mechanical and thermal properties, flexibility, and adhesion were obtained, while the enhanced adhesion was ascribed to improved interfacial interactions.…”

Section: Introductionmentioning

confidence: 99%

Addition of Graphene Oxide in Different Stages of the Synthesis of Waterborne Polyurethane-Urea Adhesives and Its Influence on Their Structure, Thermal, Viscoelastic and Adhesion Properties

Tounici

Martı́n-Martı́nez

2020

Materials

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In this study, 0.04 wt % graphene oxide (GO) was added in different stages (before and after prepolymer formation, and during water addition) of the synthesis of waterborne polyurethane-urea dispersions (PUDs) prepared by using the acetone method. The structural, thermal, mechanical, viscoelastic, surface and adhesion properties of the polyurethane-ureas (PUUs) containing 0.04 wt % GO were studied. The addition of GO before and after prepolymer formation produced covalent bonds between the GO sheets and the NCO groups of the isocyanate, whereas the GO sheets were trapped between the polyurethane chains when added during water addition step. As a consequence, depending on the stage of the PUD synthesis in which GO was added, the degree of micro-phase separation between the hard and soft segments changed differently. The addition of GO before prepolymer formation changed more efficiently the polyurethane-urea structure, i.e., the covalently bonded GO sheets disturbed the interactions between the hard segments causing lower percentage of free urethane groups, higher crystallinity, lower storage modulus, higher yield stress and T-peel strength. The interactions between the GO sheets and the polymeric chains have been evidenced by plate-plate rheology, thermal gravimetric analysis and spectroscopy. On the other hand, physical interactions between GO and the polyurethane-urea chains were produced when GO was added in water during the synthesis, i.e., GO was acting as a nanofiller, which justified the improved mechanical properties and high lap-shear strength, but poor T-peel strength.

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“…Kale et al synthesized the WPU/GOSI nanocomposites, which were prepared by epoxy functionalized GO and amine functionalized nanosilica, and then by physical mixing with WPU. The results indicated that comparing to the neat WPU films, the WPU/GOSI films with 0.1 wt% GO and 0.1 wt% SiO 2 exhibit significant improvement in mechanical and thermal properties 8 . Another example is the modification of silicon dioxide (SiO 2 ) with γ‐methacryloxypropyltrimethoxysilane (KH570) which was to obtain SiO 2 /WPU nanocomposites reported by Zhang and co‐workers 9 .…”

Section: Introductionmentioning

confidence: 96%

A novel waterborne polyurethane coating modified by highly dispersed nano‐boron carbide particles

Sun

Yang

et al. 2020

J of Applied Polymer Sci

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In this study, waterborne polyurethane (WPU) coatings were modified by adding various compositions of nano‐boron carbide (nano‐B4C) particles. In order to achieve proper dispersion of nano‐B4C in WPU and increasing chemical interactions between them, the nano‐B4C particles were treated with polyethylene glycol (PEG) or polypropylene glycol (PPG). The modified surface and microstructure of nano‐B4C were characterized by Fourier transform infrared, scanning electron microscopy and transmission electron microscopy. The deposition experiment was designed to evaluate the dispersion effect of nano‐B4C in PEG or PPG aqueous solution. The physical performance of nano‐B4C modified WPU coatings was measured following the national standards of paints and vanishes. The results revealed that the PEG6000 not only enhanced the interaction between nano‐B4C and WPU but also exhibited a remarkable ability to improve the physical performance of WPU coating. The coating with 15 wt% of nano‐B4C addition exhibited the best performance in terms of abrasion and hardness, which could be attributed to the best uniform dispersion of nano‐B4C particles in PEG6000 aqueous solution.

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Waterborne polyurethane/graphene oxide-silica nanocomposites with improved mechanical and thermal properties for leather coatings using screen printing

Cited by 90 publications

References 51 publications

Effects of Graphene-Based Fillers on Cathodic Delamination and Abrasion Resistance of Cataphoretic Organic Coatings

Effects of Graphene-Based Fillers on Cathodic Delamination and Abrasion Resistance of Cataphoretic Organic Coatings

Addition of Graphene Oxide in Different Stages of the Synthesis of Waterborne Polyurethane-Urea Adhesives and Its Influence on Their Structure, Thermal, Viscoelastic and Adhesion Properties

A novel waterborne polyurethane coating modified by highly dispersed nano‐boron carbide particles

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