Scratch behavior of epoxy coating containing self-assembled zirconium phosphate smectic layers

Fan, Lei; Hamdi, Marouen; Liu, Peng; Li, Peng; Mullins, Michael J.; Wang, Hongfeng; Li, Jiang; Krishnamoorti, Ramanan; Guo, Shaoyun; Sue, Hung‐Jue

doi:10.1016/j.polymer.2017.02.020

Cited by 38 publications

(12 citation statements)

References 51 publications

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“…Accordingly, the stabilization of nano-platelets with polymer brushes and their exfoliation into solvent-borne, lyotropic smectic phases 15–17 has been used for the formulation of organic coatings via the addition of molecularly dissolved monomers and polymers 17–21 . Such coatings have been proposed for anti-corrosive 6,22 and anti-scratch 23 applications. However, the polymer quantity that is needed to obtain a sufficiently dense and thick brush layer for steric stabilization narrows its applicability.…”

Section: Introductionmentioning

confidence: 99%

Hierarchically Ordered α-Zirconium Phosphate Platelets in Aqueous Phase with Empty Liquid

Lin

Schmelter

Imanian

et al. 2019

Sci Rep

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Platelets of α-zirconium phosphate (α-ZrP) obtained from the reflux method in H3PO4 are successfully exfoliated into water via the intercalation of alkanol amines. With volume fractions greater than 0.02 they are stacked into tactoids of few layers with a repeat distance in the order of 10 nm. The tactoids align into nematic liquid crystalline phases with irregularly wide interstices of empty liquid. Colloidal processing involves the freeze-drying of such anisotropic fluids and the dispersion of the restacked tacoids into aqueous dispersions of colloidal polymer particles of largely varying size which occupy the otherwise empty liquid between the α-ZrP tactoids and induce piling of the tactoids into columns. Real-time SAXS on drying films and TEM of the obtained coatings demonstrate that the stacked α-ZrP platelets and the polymer particles comprising liquid dry separately without polymer intercalation, while the morphology of the obtained composites can be tuned primarily by the size of the polymer colloids. Concomitant α-ZrP hydrolysis in the exfoliation step is scrutinized as a function of amine basicity and temperature. The role of zirconium based hydrolysis products in the hierarchical α-ZrP assembly is indirectly though consistently confirmed by opposing impacts of ultra-filtration and added oxoanions on the platelets’ spacing, smoothness and aggregation. HAADF-TEM imaging of scattered, singular platelets and XRD peak analysis of the pristine solid shed light on the α-ZrP synthesis. Coexisting flakes and lacunae, both similar in size to the intra-layer crystal domains, suggest the stitching of proto-α-ZrP flakes into extended layers in accordance with our observations on the aging behaviour of α-ZrP dispersions as well as with literature data on related systems.

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Section: Introductionmentioning

confidence: 99%

Hierarchically Ordered α-Zirconium Phosphate Platelets in Aqueous Phase with Empty Liquid

Lin

Schmelter

Imanian

et al. 2019

Sci Rep

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“…This is in agreement with the observations in the literature , that proper orientation of the ZrP nanoplatelets is mainly due to the excluded-volume effect of the neighboring nanoplatelets. When the volume fraction of ZrP in the polymer matrix is below 2.0%, the ZrP nanoplatelets are randomly dispersed. − The random distribution of PDA-ZrP leads to torturous paths for the permeation of corrosive mediums, and the absence of agglomeration results in reduced permeable cross-sections and prolonged torturous paths. Both of the factors are helpful for enhancing the corrosion resistance of the nanocomposite.…”

Section: Resultsmentioning

confidence: 99%

Waterborne Epoxy Resin/Polydopamine Modified Zirconium Phosphate Nanocomposite for Anticorrosive Coating

Sheng

et al. 2019

Ind. Eng. Chem. Res.

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Replacing solvent-based coatings with waterborne resin ones has become an overall trend in the coating industrial to reduce pollution caused by volatile organic compounds. It is known that introduction of flexibly designable two-dimensional nanoplatelets or zirconium phosphate (ZrP) can improve the mechanical and barrier properties of a film from solvent-based coatings. In this work, we have designed a methodology to prepare nanocomposites for waterborne coating, which consist of waterborne epoxy resin (WER) and polydopamine modified ZrP (PDA-ZrP). It is found that PDA-ZrP has excellent compatibility with WER, and consequently, the film defects of pure WER are fixed. The PDA-ZrP/WER coating exhibits an extremely low corrosion current (1.09 × 10–9 A cm–2) at 1.0% PDA-ZrP loading. It is about 500 times lower than that of the pure WER coating (5.82 × 10–7 A cm–2), and consequently, the same coating has a much smaller rusted area after a salt spray test of 310 h. It should also be noted that all materials we used are eco-friendly, and all experimental procedures are conducted under mild conditions.

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“…The FTIR analysis shows that UV/ozone treatment caused insignificant changes in the chemical structures of the studied materials. A better understanding will be gained by investigating the effect of this treatment on their surface morphology using microscopic observations [49] [50].…”

Section: Adhesion Analysismentioning

confidence: 99%

Effect of UV/ozone treatment on the wettability and adhesion of polymeric systems

Hamdi

Poulis

2019

The Journal of Adhesion

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The impact of UV/ozone treatment on the wettability and adhesion of ethylene propylene diene methylene (EPDM) rubber, polyvinyl chloride (PVC), and acrylonitrile butadiene styrene (ABS) was investigated using contact angle measurements, OWRK surface free energy model, standardized adhesion tests, and spectroscopic and microscopic observations. It is found that UV/ozone treatment enhances the wettability of the examined polymers. Also, it considerably improved the adhesion strength of PVC and ABS samples, and shifted their failure modes from adhesive to cohesive. FTIR-ATR characterization showed insignificant changes in the chemical structures of the studied materials. However, SEM observation showed newly-created wrinkles and micro-holes on treated PVC surfaces, and micropores on ABS surfaces. These UV-induced morphological changes on PVC and ABS surfaces increase the surface area and can promote mechanical interlocking with the adhesive. This explains the improvement of their adhesion strength. Implications of the current study for the processing of strongly-bonded polymeric joints are discussed.

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Scratch behavior of epoxy coating containing self-assembled zirconium phosphate smectic layers

Cited by 38 publications

References 51 publications

Hierarchically Ordered α-Zirconium Phosphate Platelets in Aqueous Phase with Empty Liquid

Hierarchically Ordered α-Zirconium Phosphate Platelets in Aqueous Phase with Empty Liquid

Waterborne Epoxy Resin/Polydopamine Modified Zirconium Phosphate Nanocomposite for Anticorrosive Coating

Effect of UV/ozone treatment on the wettability and adhesion of polymeric systems

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