New insight into the use of latent catalysts for the synthesis of urea formaldehyde adhesives and the mechanical properties of medium density fiberboards bonded with them

Dorieh, Ali; Mahmoodi, Nosrat O.; Mamaghani, Manouchehr; Pizzi, A.; Moslemi, Amin

doi:10.1016/j.eurpolymj.2019.01.002

Cited by 31 publications

(14 citation statements)

References 29 publications

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“…Accordingly, we can conclude that the microcapsules encapsulating LO was successfully fabricated. And PU microcapsules are more thermally stable than UF microcapsules, which experience a weight loss at ~100–200 °C due to the release of free formaldehyde and formaldehyde split from ether groups [37,38,39,40].…”

Section: Resultsmentioning

confidence: 99%

Preparation and Properties of Self-Healing and Self-Lubricating Epoxy Coatings with Polyurethane Microcapsules Containing Bifunctional Linseed Oil

Yang

et al. 2019

Polymers

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An organic coating is commonly used to protect metal from corrosion, but it is prone to failure due to microcracks generated by internal stress and external mechanical action. The self-healing and self-lubricating achieved in the coating is novel, which allows an extension of life by providing resistance to damage and repair after damage. In this study, a new approach to microencapsulating bifunctional linseed oil with polyurethane shell by interfacial polymerization. Moreover, the self-healing and self-lubricating coatings with different concentrations of microcapsules were developed. The well-dispersed microcapsules showed a regular spherical morphology with an average diameter of ~64.9 μm and a core content of 74.0 wt.%. The results of the salt spray test demonstrated that coatings containing microcapsules still possess anticorrosion, which is improved with the increase of microcapsules content, after being scratched. The results of electrochemical impedance spectroscopy showed a |Z|f=0.01Hz value of 104 Ω·cm2 for pure epoxy coating after being immersed for 3 days, whereas the coating with 20 wt.% microcapsules was the highest, 1010 Ω·cm2. The results of friction wear showed that the tribological performance of the coating was enhanced greatly as microcapsule concentration reached 10 wt.% or more, which showed a 86.8% or more reduction in the friction coefficient compared to the pure epoxy coating. These results indicated that the coatings containing microcapsules exhibited excellent self-healing and self-lubricating properties, which are positively correlated with microcapsules content.

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Section: Resultsmentioning

confidence: 99%

Preparation and Properties of Self-Healing and Self-Lubricating Epoxy Coatings with Polyurethane Microcapsules Containing Bifunctional Linseed Oil

Yang

et al. 2019

Polymers

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“…Compared with other wood adhesives such as phenolic resin, melamine formaldehyde resin, and polyurethane, UF has the advantages of low cost, fast curing speed, low curing temperature, easy secondary processing, good panel performance, short press times, colorless glue line, etc. [ 6 , 7 ]. Now, there are three problems to inhibit its application on industry: the first problem is toxic formaldehyde, which could pollute the environment and threaten health.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of the Urea-Formaldehyde Res-In/Reactive Halloysite Nanocomposites Adhesive with Low-Formaldehyde Emission and Good Water Resistance

Song

Chen

et al. 2021

Polymers

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Low-cost urea formaldehyde resin (UF)/reactive halloysite nanotubes (HNTs) nanocomposite adhesive was prepared successfully via in situ polymerization. The HNTs were modified to improve its compatibility with polymer. The XRD and FTIR results showed that physical and chemical interaction between the HNTs and polymer resin influenced the structure of UF owing to the functional groups on the HNTs. It is found from SEM images that the modified HNTs could be dispersed uniformly in the resin and the nanocomposite particles were spherical. The performance experiment confirmed that thermal stability of nanocomposite increased largely, formaldehyde emission of UF wood adhesive reduced 62%, and water resistance of UF wood adhesive improved by 84%. Meanwhile, the content of HNTs on the nanocomposites could be up to 60 wt %. The mechanism of the nanocomposites based on the reactive HNTs was proposed. The approach of the preparation could supply an idea to prepare other polymer/clay nanocomposites.

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“…The development of smart coatings on SH and self-lubricating attributes is highly challenging. Generally, the concept of hindering corrosion via SH facilitates autonomous repairs of cracks and damages in absence of any external intrusion [140] . SH entities encapsulation potending sensitivity to external stimuli such as pH, moisture, light, or crack propagation is critical for inculcating functionalities capable of damage repair.…”

Section: Self-healing Pnc Coatingsmentioning

confidence: 99%

“…SH entities encapsulation potending sensitivity to external stimuli such as pH, moisture, light, or crack propagation is critical for inculcating functionalities capable of damage repair. Numerous coating systems included SH agents have been investigated [135] , [136] , [137] , [138] , [139] , [140] , [141] . A commonly studied smart coating system is urea formaldehyde microcapsules (UFMC) with encapsulation of varying inhibitors and SH agents incorporated into polymeric matrix [142] .…”

Section: Self-healing Pnc Coatingsmentioning

confidence: 99%

Recently Emerging Nanotechnological Advancements in Polymer Nanocomposite Coatings for Anti-corrosion, Anti-fouling and Self-healing

Idumah

Obele

Emmanuel

et al. 2020

Surfaces and Interfaces

108

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New insight into the use of latent catalysts for the synthesis of urea formaldehyde adhesives and the mechanical properties of medium density fiberboards bonded with them

Cited by 31 publications

References 29 publications

Preparation and Properties of Self-Healing and Self-Lubricating Epoxy Coatings with Polyurethane Microcapsules Containing Bifunctional Linseed Oil

Preparation and Properties of Self-Healing and Self-Lubricating Epoxy Coatings with Polyurethane Microcapsules Containing Bifunctional Linseed Oil

Preparation and Properties of the Urea-Formaldehyde Res-In/Reactive Halloysite Nanocomposites Adhesive with Low-Formaldehyde Emission and Good Water Resistance

Recently Emerging Nanotechnological Advancements in Polymer Nanocomposite Coatings for Anti-corrosion, Anti-fouling and Self-healing

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