Preparation and Synergistic Effect of Chitosan/Sodium Phytate/MgO Nanoparticle Fire-Retardant Coatings on Wood Substrate through Layer-By-Layer Self-Assembly

Zhao, Fang; Tang, Tingli; Hou, Sijie; Fu, Yanchun

doi:10.3390/coatings10090848

Cited by 23 publications

(8 citation statements)

References 25 publications

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“…However, this approach has to be considered as performance is satisfactory for material with only one side exposed to a fire and is more industrially viable. Comparison with LbL systems is difficult as, to the best of authors’ knowledge, no cone calorimeter measurements have been taken for them [ 17 , 32 , 76 ]. PEC deposition with PEI and sodium hexametaphosphate resulted in a 10% pHRR reduction following a one hour of treatment.…”

Section: Resultsmentioning

confidence: 99%

“…SPA is highly water soluble, making it an interesting polyelectrolyte for fire retardancy. Its deposition by LbL application and sol-gel processes has been studied on various substrates [ 25 , 26 , 27 , 28 , 29 , 30 , 31 ], including wood [ 17 , 32 ]. Wood has also been impregnated with phytic acid to improve fire retardancy [ 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

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Innovative Polyelectrolyte Treatment to Flame-Retard Wood

et al. 2021

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Fire protection has been a major challenge in wood construction for many years, mainly due to the high flame spread risk associated with wood flooring. Wood fire-retardancy is framed by two main axes: coating and bulk impregnation. There is a growing need for economically and environmentally friendly alternatives. The study of polyelectrolyte complexes (PECs) for wood substrates is in its infancy, but PECs’ versatility and eco-friendly character are already recognized for fabric fire-retardancy fabrics. In this study, a new approach to PEC characterization is proposed. First, PECs, which consist of polyethyleneimine and sodium phytate, were chemically and thermally characterized to select the most promising systems. Then, yellow birch (Betula alleghaniensis Britt.) was surface-impregnated under reduced pressure with the two PECs identified as the best options. Overall, wood fire-retardancy was improved with a low weight gain of 2 wt.% without increasing water uptake.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Innovative Polyelectrolyte Treatment to Flame-Retard Wood

et al. 2021

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“…Later, until recent years, LBL self-assembly technology was applied on wood surfaces for flameproof modification. Zhao constructed a CS/sodium phytate/MgO nanoparticle coating on wood substrates via electrostatic LBL self-assembly and endowed wood with certain fire retardancy, 23 while Zhou used a similar method to load a CS/sodium phytate/TiO 2 –ZnO nanoparticle coating on wood. 24 However, both of these two coatings built using polyelectrolytes and metal oxide composite systems did not show satisfactory flame-retardant performance, and the limited oxygen indexes (LOIs) were only around 33.…”

Section: Introductionmentioning

confidence: 99%

Efficient and Durable Flame-Retardant Coatings on Wood Fabricated by Chitosan, Graphene Oxide, and Ammonium Polyphosphate Ternary Complexes via a Layer-by-Layer Self-Assembly Approach

et al. 2022

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An efficient and durable flame-retardant coating was constructed on wood via a layer-by-layer (LBL) self-assembly approach by using a chitosan (CS), graphene oxide (GO), and ammonium polyphosphate (APP) ternary flame-retardant system. Both scanning electron microscopy (SEM) characterization and Fourier transform infrared spectroscopy (FT-IR) analysis indicated that CS-GO and APP polyelectrolytes were successfully deposited on wood, and the deposition amount was increased with the numbers of the LBLs. Thermogravimetric analysis revealed that the CS-GO-APP coating could decrease the initial and maximum thermal decomposition temperature of the coated wood while increase the char residue significantly, which may be attributed to the earlier degradation of CS and APP and effective heat barrier of the incorporated GO, thus increasing the thermal stability of the modified wood. The limited oxygen index (LOI) and cone calorimeter analysis results of the pristine and coated wood indicated that the fire resistance was significantly improved after CS-GO-APP modification; when 15 BLs were deposited on the wood, the LOI was increased from pristine 22 to 42, while the heat release rate and total heat release decreased from pristine 105.50 kW/m 2 and 62.43 MJ/m 2 to 57.51 kW/m 2 and 34.31 MJ/m 2 , respectively. What is more, the 24 h immersion experiments and abrasion tests proved the excellent durability of the deposited coating. Furthermore, the SEM images of the char residues after flaming test proved that the CS-GO-APP assembly coating could promote the char layer formation on the wood surface and block the heat and flame spread, thus protecting the wood from fire attacking.

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“…Studies researching the relationship between the dynamic modulus of elastic (MOEd) and the static modulus of elastic (MOEs) have primarily used the transverse vibration method, the vertical vibration method, the ultrasonic wave method, the stress wave method, etc. (Mohammad and Mohsen 2017;Bi et al 2020;Zhao et al 2020;Fu et al 2021). Previous studies showed that correlation between the MOEd and MOEs was relatively higher when using the transverse vibration method compared to other methods (Bi et al 2020;Fu et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Vibrational characteristics of four wood species commonly used in wood products

Liu

2021

BioRes

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The effects of the moisture content, density, and striking direction of a hammer on the vibrational characteristics, i.e., the fundamental frequency and dynamic modulus of elasticity, of four wood species, i.e., poplar (Populus tomentosa), mahogany (Swietenia mahagoni), beech (Fagus orientalis), and ash (Fraxinus excelsior), commonly used in wood products were investigated, aiming to provide basic evidence for the nondestructive testing of wood materials. The results showed that the effect of the wood species on the fundamental frequency, dynamic modulus of elasticity, and static modulus of elasticity was statistically significant. The dynamic moduli of elasticity of the four wood species were higher than the corresponding static moduli of elasticity. The effect of the striking direction on the dynamic modulus of elasticity was not significant, indicating that no matter where the hammer struck, i.e., radial and tangential surfaces, the fundamental frequency was essentially constant. Negative relationships were found between the fundamental frequency and the density and moisture when the data of the four wood species were viewed as a population sample. The vibrational characteristics of each wood species varied, which can be applied to the nondestructive testing of wood.

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Preparation and Synergistic Effect of Chitosan/Sodium Phytate/MgO Nanoparticle Fire-Retardant Coatings on Wood Substrate through Layer-By-Layer Self-Assembly

Cited by 23 publications

References 25 publications

Innovative Polyelectrolyte Treatment to Flame-Retard Wood

Innovative Polyelectrolyte Treatment to Flame-Retard Wood

Efficient and Durable Flame-Retardant Coatings on Wood Fabricated by Chitosan, Graphene Oxide, and Ammonium Polyphosphate Ternary Complexes via a Layer-by-Layer Self-Assembly Approach

Vibrational characteristics of four wood species commonly used in wood products

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