Investigation of the size effect of graphene nano-platelets (GnPs) on the anti-corrosion performance of polyurethane/GnP composites

Um, Jun Geun; Jun, Yun‐Seok; Alhumade, Hesham; Krithivasan, Hariharan; Lui, Gregory; Yu, Aiping

doi:10.1039/c8ra02087f

Cited by 48 publications

(26 citation statements)

References 56 publications

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“…The Tafel plot provides the corrosion potential (E corr ) and corrosion current (I corr ), and these parameters enable a quantitative comparison between the anti‐corrosion performance of a material. For instance, the enhancement of the anti‐corrosion performance is associated with the tendency for an increase in the E corr and a decrease in the I corr . The two parameters, E corr and I corr , are determined by the intersection point extrapolated cathodic and anodic curves in the Tafel slopes.…”

Section: Resultsmentioning

confidence: 99%

“…This is attributed to the fact that the smaller size of C750 is not only uniformly dispersed within the PU but also offers a high surface area. This effect considerably contributes to the construction of an efficient filler arrangement that suppresses the diffusion of a corrosive agent onto the Cu substrate . For this reason, PU/GO‐M25 composites show a higher E corr and lower I corr than the PU/C750 composites at the same fillers content.…”

Section: Resultsmentioning

confidence: 99%

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Engineering investigation for the size effect of graphene oxide derived from graphene nanoplatelets in polyurethane composites

Jun

Elkamel

et al. 2020

Can J Chem Eng

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In this study, commercial polyurethane (PU) and graphene nanoplatelets (GnP) and their derivative graphene oxide (GO) were used to fabricate PU composites.The size effect of fillers on mechanical properties and anti-corrosion performance of as-prepared composites was thoroughly investigated. It was found that GO was more uniformly dispersed in the PU matrix than GnP due to its compatibility with PU. Furthermore, GO led to the higher mechanical properties and anti-corrosion performance than PU/GnP composites, and the properties were strongly dependant on the size of the GO. Specifically, incorporating large sized GO (GO-M25) in 0.5 wt% indicated the highest average synergetic tensile modulus up to 53% from the neat PU and the lowest corrosion rate of 0.001 MPY (1 MPY = 0.547 g Á m −2 Á d −1 ). This phenomenon was attributed to the fact that the larger size of GO is not only uniformly dispersed within the PU matrix but also enables interaction between PU and GO. Conversely, PU composites incorporated with the small sized GO (GO-C750) did not show elastic behaviour from 0.1 to 0.5 wt% of the filler. This is due to the fact that the high surface area and hydrophilic functionalities of GO-C750 resulted in hard-segment content reduction in PU. This research can help in the design of a PU coating that is physically improved and that has a superior anti-corrosive capacity, particularly for pipelines in the oil-sands transportation industry.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Engineering investigation for the size effect of graphene oxide derived from graphene nanoplatelets in polyurethane composites

Jun

Elkamel

et al. 2020

Can J Chem Eng

Self Cite

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“…Nanoplatelets of graphene or graphene oxide (GO) [21][22][23] can be produced chemically [24] or electrochemically [25] in a large amount by exfoliation of graphite. These are appropriate for large scale applications and the costs are much lower than those produced by CVD or on SiC wafers.…”

Section: Introductionmentioning

confidence: 99%

Large Area Graphene Deposition on Hydrophobic Surfaces, Flexible Textiles, Glass Fibers and 3D Structures

et al. 2019

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Graphene and its derivatives have many superior electrical, thermal, mechanical, chemical, and structural properties, and promise for many applications. One of the issues for scalable applications is the lack of a simple, reliable method that allows the deposit of a well-ordered monolayer using low-cost graphene flakes onto target substrates with different surface properties. Another issue is the adhesion of the deposited graphene thin film, which has not been well investigated yet. Following our former finding of a double self-assembly (DSA) process for efficient deposition of a monolayer of graphene flakes (MGFs), in this work we demonstrate that the DSA process can be applied even on very challenging samples including highly hydrophobic polytetrafluoroethylene (PTFE), flexible textiles, complex 3D objects, and thin glass fibers. Additionally, we tested adhesion of the graphene flakes on the flat glass substrate by scotch tape peel test of the MGFs. The results show that the graphene flakes adhere quite well on the flat glass substrate and most of the graphene flakes stay on the glass. These findings may trigger many large-scale applications of low-cost graphene feedstocks and other 2D materials.

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“…Their classifications depend on the thickness, lateral size, and elemental concentration. In any given batch, thickness can vary from 0.34 nm to 100 nm and the number of graphene layers is typically between 10-60 23,24 . This structure leads to the high surface area and stability of GnPs, and research has found that their integration into composites can increase mechanical, thermal and electrical conductivity properties 25 .…”

mentioning

confidence: 99%

Hybrid biocomposites from polypropylene, sustainable biocarbon and graphene nanoplatelets

Watt

Abdelwahab

Snowdon

et al. 2020

Sci Rep

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polypropylene (pp) is an attractive polymer for use in automotive parts due to its ease of processing, hydrophobic nature, chemical resistance and low density. the global shift towards eliminating nonrenewable resource consumption has promoted research of sustainable biocarbon (BioC) filler in a pp matrix, but this material often leads to reduction in composite strength and requires additional fillers. Graphene nano-platelets (GnPs) have been the subject of considerable research as a nanofiller due to their strength, while maleic anhydride grafted polypropylene (MA-g-pp) is a commonly used compatibilizer for improvement of interfacial adhesion in composites. this study compared the thermomechanical properties of PP/BioC/MA-g-PP/GnP composites with varying wt.% of GnP. Morphological analysis revealed uniform dispersion of BioC, while significant agglomeration of GnPs limited their even dispersion throughout the PP matrix. In the optimal blend of 3 wt.% GnP and 17 wt.% BioC biocontent, tensile strength and modulus increased by ~19% and ~22% respectively, as compared to 20 wt.% BioC biocomposites. thermal stability and performance enhancement occurred through incorporation of the fillers. Thus, hybridization of fillers in the compatibilized matrix presents a promising route to the enhancement of material properties, while reducing petroleum-based products through use of sustainable BioC filler in composite structures.

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Investigation of the size effect of graphene nano-platelets (GnPs) on the anti-corrosion performance of polyurethane/GnP composites

Abstract: In this article, polyurethane/graphene nano-platelet (PU/GnP) composites were fabricated via planetary centrifugal mixer (PCM) and cast on polyethylene terephthalate (PET) and copper substrates.

Cited by 48 publications

References 56 publications

Engineering investigation for the size effect of graphene oxide derived from graphene nanoplatelets in polyurethane composites

Engineering investigation for the size effect of graphene oxide derived from graphene nanoplatelets in polyurethane composites

Large Area Graphene Deposition on Hydrophobic Surfaces, Flexible Textiles, Glass Fibers and 3D Structures

Hybrid biocomposites from polypropylene, sustainable biocarbon and graphene nanoplatelets

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