Thermal and anticorrosion properties of polyurethane coatings derived from recycled polyethylene terephthalate and palm olein-based polyols

Adamu, Abbas Ahmad; Sarih, Norazilawati Muhamad; Gan, Seng Neon

doi:10.1098/rsos.201087

Cited by 9 publications

(3 citation statements)

References 36 publications

(43 reference statements)

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“…Thermoplastic PU topcoats, the most abundantly employed coating systems, have been known to provide excellent environmental shielding, smoother surface finish, and scratch and corrosion resistance. , Their tough, rubbery nature allows them to avoid plastic deformation during impact and erosion tests. Adamu et al reported higher thermal stability and anticorrosion characteristics when traditional PU coatings were blended with PET . Modified urethane resins have also been studied for environmental protection of radomes .…”

Section: Resultsmentioning

confidence: 99%

Characterization of Environmentally Conditioned Quartz–Cyanate Ester Composites for Radome Applications

Chivukula

Reddy

Adusumalli

et al. 2022

Ind. Eng. Chem. Res.

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Because quartz–cyanate ester (QCE) composites are employed to fabricate missile and aircraft radomes, retaining their structural and electromagnetic (EM) integrity after prolonged exposure to environmental stresses is essential for long-term deployment as radar protectors. Therefore, in this study, QCE composite samples were subjected to environmental conditioning tests, namely, transient temperature (transition from −67 to 145 °C), high-temperature storage (cycling between 35 and 85 °C), thermal shock (cycling between −55 and 100 °C), fluid contamination (immersion in mineral and turbine oils), and humidity cycles (conditioning at 30 °C and 85% RH), to observe the effect of conditioning on the physical, morphological, thermal, mechanical, and dielectric properties of composites. Interfacial damage was observed in all the conditioned samples. Samples after fluid immersion test were found to have the highest deviation in properties compared to unconditioned ones. Fluid diffusion led to higher surface crack width, lower impact damaged area, and higher EM energy dissipation (higher dielectric loss tangent). High-temperature storage tested samples had the highest surface crack intensity, while humidity cycles caused matrix plasticization, resulting in lower density and thermal conductivity values. A high degree of postcuring in thermally shocked samples resulted in brittleness of cyanate ester, leading to an increase in density and impact damaged area. Although a slight degree of damage is reported, the change in QCE composite properties postconditioning is not significant enough to prevent its application as uncoated radome materials, except for rain erosion at 150 m/s.

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Section: Resultsmentioning

confidence: 99%

Characterization of Environmentally Conditioned Quartz–Cyanate Ester Composites for Radome Applications

Chivukula

Reddy

Adusumalli

et al. 2022

Ind. Eng. Chem. Res.

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“…Although they cannot be considered as bio-based materials, environmentally friendly PU coatings have been also prepared by using wastes as a source for the polyol synthesis. [77,78] In this regard, it is worth mentioning the work by Adamu et al, who synthesized polyols incorporating up to 15% of recycled PET from waste drinking bottles into palm olein alkyd in the presence of ethylene glycol. [77] The resulting PU coatings, obtained by reacting the PET-containing polyol with methylene diphenyldiisocyanate in the presence of a tin catalyst, showed improved corrosion protection ability.…”

Section: Bio-based Coatingsmentioning

confidence: 99%

Recent Trends in Waterborne and Bio‐Based Polyurethane Coatings for Corrosion Protection

Luna

2022

Adv Materials Inter

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polyurethanes. Different approaches have been identified for the realization of green PUs, which include-but are not limited to-renewability of the starting materials, sustainability of the synthesis itself, isocyanate-free formulations, and reduction of VOC emissions by limiting the use of organic solvents. [4] In particular, the present review deals with recent researches on two classes of green PUs, namely waterborne and bio-based formulations, focusing on their application as coatings to protect metal surfaces from corrosion. As such, manuscripts specifically addressing the synthesis and/or standard chemicophysical characterization of newly proposed formulations were not considered here. Readers interested in the synthetic aspects of green PUs can refer to recent comprehensive reviews on the topic. [5][6][7][8][9] In the following the recent relevant literature published since 2015 is critically reviewed, highlighting the main strategies pursued to develop reliable and highly performing anticorrosion coatings based on waterborne and bio-based PUs. Then, the collected data on their protective performances are discussed. Waterborne CoatingsWaterborne polyurethanes (WB-PUs) stepped out in the early 1990s driven by the increasingly strict environmental legislation in North America and Europe. [3] The use of sole water evidently solves the issue related to the huge VOC emission associated with traditional solvent-based coatings. In addition, the presence of water as one of the components removes the possibility of any toxic unreacted isocyanate in the system. [9] The introduction of hydrophilic groups in the formulation is essential to guarantee the stability of WB-PU dispersions. [10] On the other hand, it also detrimentally impacts the waterresistance of the resulting coating, hampering the full exploitation of this class of materials for anticorrosion purposes. Playing with the rich PU chemistry is clearly one possible way to tailor the coating properties, including water resistance and thus anticorrosion ability. [11][12][13] Both the polyol and the diisocyanate used for polyurethane synthesis can indeed be properly selected to maximize the coating protective efficacy. In this perspective, Li et al. found that a balanced polyether/polyester polyol ratio is optimal for anticorrosion applications. [12] Yu et al., instead, focused on the role of the diisocyanate structure, highlighting that the protective ability of WB-PU synthesized with 4,4′-dicyclohexylmethane diisocyanate outperforms Polyurethanes (PUs) have been extensively exploited for the production of protective coatings thanks to the versatility of their chemistry, which allows to adjust the coating properties depending on the final application. In the last decade, the concerns on the negative impact on the environment and human health of traditional petroleum-based and solvent-borne PUs have fostered the research on more environmentally friendly alternatives. This review article provides an overview of the recent approaches that have been profitably pu...

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“…These triglycerides were the main components used during the polymerization of the coconut oil and formed into polyurethane-based coating [7]. PU-based coatings according to Abbas et.al, that it displays good thermal and anticorrosion properties in which the decrease of Icorr and an increase of the Ecorr revealed that it exhibits corrosion protection ability [8]. However, PU coatings are polymers if exposed to ultraviolet radiation cause breakage of the chemical bonds in the material, thus a reduction of its molecular weight and loss in it mechanical features known as photo-oxidative degradation [9].…”

Section: Introductionmentioning

confidence: 99%

TiO<sub>2</sub>- Polyurethane Cocopol Blend Nanocomposites as an Anticorrosion Coating for Mild Steel

Ruda,

Bonilla,

Ubas

et al. 2024

SSP

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Mild steels were the most frequently used materials in industries and factories since it possesses unique properties but due to weak environmental changes, these cause deterioration and corrosion to the materials’ surface. To prevent such, protective coatings were applied to protect against corrosion in which by incorporating titanium nanoparticles in polyurethane coatings. Titanium nanoparticles were synthesized using titanium butoxide as a precursor. The obtained nanoparticles were used as an inhibitor mixed with coconut oil-based polyurethane polyol blend against the corrosion on mild steel of 3.5% of sodium chloride solution which has been investigated using the Tafel polarization technique. The polarization curves of the corrosion potential for bare mild steel, along with different amounts of titanium nanoparticles coating, exhibit a positive shift. This shift indicates that the coating film effectively reduces the transport path for the corrosive solution, providing a protective barrier against corrosion. This observation is further supported by the results of the adhesive strength test, which demonstrates that the attachment of the coating films to the metal increases with higher amounts of titanium nanoparticles. This indicates improved adhesion and a stronger bond between the coating and the substrate, enhancing the overall corrosion resistance. The increase of contact angle test confirms the improvement of the coating’s hydrophobicity with the addition of titanium nanoparticles. This suggests that the coating repels water more effectively, further contributing to its protective properties against corrosion. Results also show that the addition of 4wt% of titanium nanoparticles has better anti-corrosion properties than the PU CCP alone, and 0.5, 1.0, and 2.0wt% of titanium added.

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Thermal and anticorrosion properties of polyurethane coatings derived from recycled polyethylene terephthalate and palm olein-based polyols

Cited by 9 publications

References 36 publications

Characterization of Environmentally Conditioned Quartz–Cyanate Ester Composites for Radome Applications

Characterization of Environmentally Conditioned Quartz–Cyanate Ester Composites for Radome Applications

Recent Trends in Waterborne and Bio‐Based Polyurethane Coatings for Corrosion Protection

TiO<sub>2</sub>- Polyurethane Cocopol Blend Nanocomposites as an Anticorrosion Coating for Mild Steel

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