Outdoor exposure and accelerated weathering of polyurethane/polysiloxane hybrid coatings

Gao, Tongzhai; He, Zhouying; Hihara, Lloyd H.; Mehr, Hamideh Shokouhi; Soucek, Mark D.

doi:10.1016/j.porgcoat.2019.01.046

Cited by 32 publications

(14 citation statements)

References 24 publications

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“…The most common method is immersion, [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] where coating films are placed in a chemical solution and analyzed periodically for physical and/or chemical changes. Analytical methods include optical or electron microscopes to detect visual degradation like cracks, 10,18 IR spectra to analyze the chemical degradation 13,19,22 or quantify diffusion of chemicals, 20 and dynamic mechanical analysis (DMA) to monitor the degradation of mechanical properties. 3,5,6,9,21,22 In addition, permeation cells are applicable to measure the rate of diffusion or permeation of chemicals across organic coatings.…”

Section: Experimental Methods For Coating Degradation Studies and Aims Of The Workmentioning

confidence: 99%

“…Analytical methods include optical or electron microscopes to detect visual degradation like cracks, 10,18 IR spectra to analyze the chemical degradation 13,19,22 or quantify diffusion of chemicals, 20 and dynamic mechanical analysis (DMA) to monitor the degradation of mechanical properties. 3,5,6,9,21,22 In addition, permeation cells are applicable to measure the rate of diffusion or permeation of chemicals across organic coatings. More specifically, two types of cells are widely 4 used: two-chamber permeation cell for electrolyte solutions 23,24 and one-chamber permeation cells for highly volatile compounds.…”

Section: Experimental Methods For Coating Degradation Studies and Aims Of The Workmentioning

confidence: 99%

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Methanol degradation mechanisms and permeability phenomena in novolac epoxy and polyurethane coatings

et al. 2021

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Section: Experimental Methods For Coating Degradation Studies and Aims Of The Workmentioning

confidence: 99%

Section: Experimental Methods For Coating Degradation Studies and Aims Of The Workmentioning

confidence: 99%

Methanol degradation mechanisms and permeability phenomena in novolac epoxy and polyurethane coatings

et al. 2021

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“…When analyzing the durability of polyurethane/polysiloxane hybrid coatings, accelerated aging procedures were found to produce much more severe effects than three outdoor harsh exposures (i.e., industrial, volcanic and marine environments) [ 42 ]. The accelerated aging was performed in a weather-meter machine for 3 months, exposing the specimens to light (with the aid of a Xenon Arc lamp), moisture (spraying water in a “dark” cycle) and increasing temperature to mimic the morning conditions.…”

Section: Comparison Between On Field Durability Tests With Accelerated Proceduresmentioning

confidence: 99%

Can Accelerated Aging Procedures Predict the Long Term Behavior of Polymers Exposed to Different Environments?

Frigione

Rodríguez-Prieto

2021

Polymers

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During their useful life, polymers are subject to degradation processes due to exposure to specific environmental conditions over long times. These processes generally lead to changes, almost always irreversible, of properties and performances of polymers, changes which would be useful to be able to predict in advance. To meet this need, numerous investigations have been focused on the possibility to predict the long-term performance of polymers, if exposed to specific environments, by the so called “accelerated aging” tests. In such procedures, the long-term behavior of polymeric materials is typically predicted by subjecting them to cycles of radiations, temperatures, vapor condensation, and other external agents, at levels well above those found in true conditions in order to accelerate the degradation of polymers: this can produce effects that substantially deviate from those observable under natural exposure. Even following the standard codes, different environmental parameters are often used in the diverse studies, making it difficult to compare different investigations. The correlation of results from accelerated procedures with data collected after natural exposure is still a debated matter. Furthermore, since the environmental conditions are a function of the season and the geographical position, and are also characteristic of the type of exposure area, the environmental parameters to be used in accelerated aging tests should also consider these variables. These and other issues concerning accelerated aging tests applied to polymers are analyzed in the present work. However, bearing in mind the limitations of these practices, they can find useful applications for rating the durability of polymeric materials.

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“…It is what makes them preferably used as primers or intermediate coats. Aliphatic polyurethanes can be linear or cyclic and offer better UV resistance and are used as topcoat when good weatherability is needed but are more expensive and react more slowly [1,100,113,114]. Figure 20 shows some typical chemical structure of aromatic and aliphatic isocyanates.…”

Section: Generalitiesmentioning

confidence: 99%

Powder and High-Solid Coatings as Anticorrosive Solutions for Marine and Offshore Applications? A Review

Pélissier

Thierry

2020

Coatings

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The constant change in coating technology and environmental regulations has led to the development of low-solvent to solvent-free organic coatings, such as powder and high-solid coatings. These two technologies are well developed, but are still not the preferred choice when considering anticorrosive coating for marine and offshore applications. This mostly arise from a lack of perspective in their long-term behavior and from the difficulty in their applications. This review’s principal aim is to describe powder and high-solid technologies from their formulation and application to their use in marine and offshore applications while recalling and giving key notions needed when the field of anticorrosive coatings is considered. First, the requirement for coatings to be called anticorrosive will be given alongside with their protection and failure mechanisms. The formulation and application for high-solid and powder coatings will be exposed followed by the description of the type of coating chemistry used in harsh environment. Finally, high-solid and powder coatings behavior in these types of environment will be discussed.

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Outdoor exposure and accelerated weathering of polyurethane/polysiloxane hybrid coatings

Cited by 32 publications

References 24 publications

Methanol degradation mechanisms and permeability phenomena in novolac epoxy and polyurethane coatings

Methanol degradation mechanisms and permeability phenomena in novolac epoxy and polyurethane coatings

Can Accelerated Aging Procedures Predict the Long Term Behavior of Polymers Exposed to Different Environments?

Powder and High-Solid Coatings as Anticorrosive Solutions for Marine and Offshore Applications? A Review

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