Recent developments in waterborne polyurethane dispersions (WPUDs): a mini-review on thermal and mechanical properties improvement

Vaidya, Swapnil M.; Jadhav, Simran M.; Patil, Mitesh J.; Mestry, Siddhesh; Mahajan, Umesh R.; Mhaske, S. T.

doi:10.1007/s00289-021-03814-7

Cited by 18 publications

(2 citation statements)

References 129 publications

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“…As it is noted in figure 1 that lanthanum, cerium, europium and terbium are the most studied, the 35% predominance of studies involving the luminescence property can be explained. The mechanical properties can be justified by the PU, as they are one of several characteristics of this material (Allami et al, 2021;Kojio et al, 2010;Vaidya et al, 2022). Polyurethane nanocomposite and yttrium aluminium garnet doped with terbium (III).…”

Section: Resultsmentioning

confidence: 99%

Polyurethane and rare-earth materials: a review

et al. 2023

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Polyurethanes are polymers produced from polyols and isocyanates. Commonly, aiming to modify physicochemical properties of the resulting material, other chemical species can be introduced in the polymeric structure, modifying its mechanical, thermal and electronic characteristics and conferring more stability and resistance to external factors. The rare earth chemical elements, composed of lanthanides, Y and Sc, can give the materials such improved characteristics, and are still less researched when compared to other chemical elements. In the present study, a systematic search was carried out on the Web of Science platform. No studies were identified with polyurethanes and Sc, Pr, Pm, Sm, Dy and Ho, showing room for unexplored studies. Most of the articles investigated the luminescent characteristics of the chemical elements that were used, but it was also possible to notice trends in changing mechanical and thermal properties.

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Section: Resultsmentioning

confidence: 99%

Polyurethane and rare-earth materials: a review

et al. 2023

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“…In recent years, nanoparticle suspensions of waterborne polyurethane (WPU), rather than PU soluble in organic solvents, have been actively investigated to reduce the environmental impact. 1,2) Because the isocyanate groups that form the polyurethane backbone bonds are highly reactive with water, it is difficult to synthesize WPU particles by conventional emulsion polymerization, therefore, other methods are employed. For example, an acetone solution of WPU with a carboxylic acid incorporated into the polyurethane backbone is synthesized in advance, and when water is added dropwise, a phase inversion from the acetone phase to the aqueous phase occurs, resulting in the formation of WPU nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Particle elastic modulus analysis of waterborne polyurethane nanoparticles by ultrasound scattering method

Tajika,

Norisuye

2024

Jpn. J. Appl. Phys.

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When water is dropped gradually to an acetone solution of concentrated polyurethane containing ionic functional groups, a phase inversion occurs and nanoparticles of waterborne polyurethane (WPU) are formed. Evaporation of water from such aqueous particle suspensions yields polyurethane sheets, but the properties of these sheets are different from those obtained by evaporation of solvent from WPU acetone solutions. In this study, ultrasonic spectroscopy analysis combined with an ultrasonic scattering theory was performed on the microparticle suspensions to evaluate the elastic modulus of the individual particles. The nanoparticles obtained by phase inversion are stabilized by ionic substituents, and the bulk modulus of the particles at 30 wt% was shown to be different from that of bulk sample obtained by drying acetone, in spite of the fact that they are the same polymer material. Even after 95% concentration beyond the maximum packing concentration, the film properties were observed to be particle size dependent, suggesting that the nanostructure plays an important role in film properties.

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Preparation of lanthanide aluminate‐encapsulated silica nanoparticles toward long‐persistent photoluminescent polymer paint with superhydrophobic and anticorrosion properties

Al‐Senani,

Al‐Qahtani

2024

J of Applied Polymer Sci

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Smart afterglow paints can function as energy‐saving products that are able to persist lighting in the dark. Additionally, polyurethane paints (PURPs) have shown some limitations, including weak adhesion, poor mechanical performance, poor corrosion, and low water resistance as compared with solvent‐based paints. Herein, nanoparticles of lanthanide aluminate (NLA; 16–24 nm) were mixed with polyurethane and silica to develop novel photoluminescent nanocomposite paints. A precursor of NLA‐encapsulated silica nanoparticles (NLA@Silica; 200–225 nm) can be described as a SiO2‐coated NLA pigment prepared by the heterogeneous precipitation method. Steel was coated with nanocomposite paints made of PURP, silica, and NLA. Using emission spectra and Commission Internationale de l'Eclairage (CIE) Lab coordinates, the coloring and transparency of painted films were investigated. Upon excitation at 365 nm, the UV‐irradiation of transparent painted films showed green emission at 518 nm. The hydrophobic activity and hardness properties were examined. Using electrochemical impedance spectroscopy (EIS), the anticorrosion of coatings applied to mild steel was studied. Improved anticorrosion characteristics were observed due to the fluorescence of NLA@Silica in the applied coatings. The optimal long‐lasting luminous characteristics were observed for nanocomposite films containing 12.5% of NLA@Silica.

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Recent developments in waterborne polyurethane dispersions (WPUDs): a mini-review on thermal and mechanical properties improvement

Cited by 18 publications

References 129 publications

Polyurethane and rare-earth materials: a review

Polyurethane and rare-earth materials: a review

Particle elastic modulus analysis of waterborne polyurethane nanoparticles by ultrasound scattering method

Preparation of lanthanide aluminate‐encapsulated silica nanoparticles toward long‐persistent photoluminescent polymer paint with superhydrophobic and anticorrosion properties

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