Corrosion-resistant polyurethane coatings from structure-homogenized biorefinery lignin through fractionation and oxypropylation

Wang, Xiang; Nayanathara, R.M. Oshani; Leng, Weiqi; Caldona, Eugene B.; Liu, Liyang; Advíncula, Rigoberto C.; Zhang, Zhao; Zhang, Xuefeng

doi:10.1016/j.jafr.2022.100452

Cited by 12 publications

(8 citation statements)

References 38 publications

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“…Prominent sectors like construction, automotive manufacturing, maritime activities, and aerospace operations experience substantial financial losses attributable to the damages incurred from corrosion. , Frequently employed strategies for slowing down corrosion rates include cathodic protection, passivation (or anodic protection), and barrier protection in the form of coatings . Coatings are widely used in mitigating corrosion due to their ability to create a protective interface between metallic surfaces and corrosive agents. − They serve as a layer of barrier, safeguarding against moisture, oxygen, salts, and other corrosive elements that trigger metal degradation. The application of coatings not only extends the lifespan of metallic structures and equipment but also enhances esthetic appeal, reduces maintenance requirements, and provides resistance to abrasion and chemical exposure.…”

Section: Introductionmentioning

confidence: 99%

Adhesion-Diffusional-Based Corrosion Protection Mechanisms of Polyaniline-Primed Fluoropolymer Coatings

Ali,

Tigno,

Honeyman

et al. 2024

ACS Appl. Polym. Mater.

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In this study, we developed a series of dual-coating systems composed of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and electrodeposited polyaniline (PANI) as the primary coating and primer, respectively, for stainless steel (SS). Prior to the PVDF-HFP topcoat application, PANI (in either a doped emeraldine salt (ES) or dedoped base (EB) form) was electrodeposited potentiodynamically on either an etched or unetched SS substrate using H 2 C 2 O 4 as the supporting electrolyte. Tape tests showed improved PVDF-HFP adhesion on EB-PANI-primed substrates than on ES-primed samples. Impedance analysis and potentiodynamic chemistry were used to quantitatively investigate the electrochemical behavior and corrosion kinetics of the coated samples, respectively, in a 3.5 wt % NaCl corrosive solution. Electrochemical results revealed that the PVDF-HFP/EB-PANI dual-coating system exhibited superior corrosion resistance (low-frequency impedance modulus, |Z| 0.1Hz ∼ 10 6 Ω cm 2 ) compared to either the dual PVDF-HFP/ES-PANI or pristine PVDF-HFP coating (|Z| 0.1Hz ∼ 10 4 Ω cm 2 ). Based on the correlation between electrochemical data and water uptake, high water diffusivity for ES-PANI-primed PVDF-HFP coating (diffusivity, D ∼ 10.0 × 10 −10 mm 2 s −1 ) was obtained due to the ionic solvation of counterions, while relatively lower diffusivity for the EB-PANI-primed counterpart (D ∼ 5.0 × 10 −10 mm 2 s −1 ) was observed due to the effective impingement of water ingress by the insulating hydrophobic EB-PANI undercoat. Overall, we investigated the impact of the electronic state of an electroconductive polymer primer on the corrosion resistance of a two-coat system with a fluoropolymer topcoat and explored nuanced effects on adhesion and electrolyte diffusion, providing comprehensive insights and laying the foundation for tailored design strategies to enhance corrosion resistance, filling a critical gap in the current understanding and guiding future research in coating science innovation.

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Section: Introductionmentioning

confidence: 99%

Adhesion-Diffusional-Based Corrosion Protection Mechanisms of Polyaniline-Primed Fluoropolymer Coatings

Ali,

Tigno,

Honeyman

et al. 2024

ACS Appl. Polym. Mater.

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“…By measuring the impedance of a given system across varying frequencies, EIS provides detailed information on the electrochemical processes transpiring at the interface between the coating and substrate. This technique also proves particularly useful for assessing the barrier properties of coatings, detecting early stages of degradation and predicting the long-term performance of protective layers against corrosion. − …”

Section: Resultsmentioning

confidence: 99%

Superhydrophobic, Highly Adhesive, and Corrosion-Protective Fluoropolymer-Modified Polythiophene Coatings

Ali,

Honeyman,

Domalanta

et al. 2024

Ind. Eng. Chem. Res.

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In this study, we introduce an approach aimed at enhancing the adhesion, surface stability, water repellency, and corrosion resistance of electrodeposited polythiophene (PTH) coatings by integrating a thienylsubstituted silane coupling agent as a surface modifier alongside poly-(vinylidene fluoride-co-hexafluoropropylene) as a topcoat. The fluoropolymer inclusion further improves the resultant coating's water repellency, while the utility of a silane coupling agent addresses a crucial, yet often overlooked, issue in polymeric coatings�ensuring strong adhesion to steel substrates. Spectroscopic analyses confirm the silanization of steel, indicating a strong chemical bond between the substrate and coating. Subsequent tape adhesion tests substantiate this finding, revealing minimal coating delamination and corroborating the enhanced adhesion achieved. Even after rigorous cyclic corrosion tests, the coating maintains a consistently high water contact angle (∼163°), demonstrating remarkable stability and durability, while impedance measurements and potentiodynamic polarization unveil a notable increased corrosion resistance (low-frequency impedance modulus, |Z| 0.1 Hz ∼ 7.2 MΩ cm 2 , corrosion potential, E CORR ∼ 0.14 V, and corrosion current, I CORR ∼ 0.76 nA). Our approach, unprecedented in existing literature, not only extends the lifespan of PTH coatings but also broadens their utility in corrosion-prone environments. Overall, this study sets a new benchmark for developing durable and hydrophobic protective coatings, offering a promising avenue for future research and industrial applications.

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“…However, lignin-based PUs exhibit higher brittleness due to the rigid and complex aromatic structure of lignin, which limits the flexibility and ductility of the resulting polymer matrix [ 75 ]. Vegetable oil-based PUs can potentially overcome brittleness due to their aliphatic structure, which provides greater flexibility and elasticity compared to the aromatic structure of lignin, resulting in a more ductile and less brittle polymer matrix [ 83 , 84 ]. Lignin and tannin-based PUs often suffer from poor water resistance due to the hydrophilic nature of lignin’s hydroxyl groups, which can limit their application in environments with high moisture exposure [ 76 ].…”

Section: Vegetable Oil-based Adhesives: An Overviewmentioning

confidence: 99%

Eco-Friendly and High-Performance Bio-Polyurethane Adhesives from Vegetable Oils: A Review

Maulana,

Wibowo,

Mardawati

et al. 2024

Polymers

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Current petrochemical-based adhesives adversely affect the environment through substantial volatile organic compound (VOC) emissions during production, contributing to air pollution and climate change. In contrast, vegetable oils extracted from bio-resources provide a compelling alternative owing to their renewability, abundance, and compatibility with adhesive formulation chemistry. This review aimed to critically examine and synthesize the existing scholarly literature on environmentally friendly, sustainable, and high-performance polyurethane adhesives (PUAs) developed from vegetable oils. The use of PUAs derived from vegetable oils promises to provide a long-term replacement while simultaneously maintaining or improving adhesive properties. This quality renders these adhesives appropriate for widespread use in various sectors, including construction, automotive manufacturing, packaging, textile, and footwear industries. This review intended to perform a comprehensive assessment and integration of the existing research, thereby identifying the raw materials, strengths, weaknesses, and gaps in knowledge concerning vegetable oil-based PUAs. In doing so, it responded to these gaps and proposes potential avenues for future research. Therefore, this review accomplishes more than merely evaluating the existing research; it fosters the advancement of greener PUA technologies by identifying areas for improvement and innovation towards more sustainable industrial practices by showcasing vegetable oil-based PUAs as viable, high-performance alternatives to their petroleum-based counterparts.

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Corrosion-resistant polyurethane coatings from structure-homogenized biorefinery lignin through fractionation and oxypropylation

Cited by 12 publications

References 38 publications

Adhesion-Diffusional-Based Corrosion Protection Mechanisms of Polyaniline-Primed Fluoropolymer Coatings

Adhesion-Diffusional-Based Corrosion Protection Mechanisms of Polyaniline-Primed Fluoropolymer Coatings

Superhydrophobic, Highly Adhesive, and Corrosion-Protective Fluoropolymer-Modified Polythiophene Coatings

Eco-Friendly and High-Performance Bio-Polyurethane Adhesives from Vegetable Oils: A Review

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