Tannic acid as cross-linker and flame retardant for preparation of flame-retardant polyurethane elastomers

Wang, Jin; Zhou, Shiyu; Zhang, Qiang; Lu, Guo-Ping; Lin, Yamei

doi:10.1016/j.reactfunctpolym.2022.105454

Cited by 17 publications

(10 citation statements)

References 74 publications

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“…With the incorporation of LHL multiple nanoscale minerals, the amount of CO 2 was highly decreased while the amount of CO was increased. This was indicative of incomplete combustion . These phenomena indicated the superior fire-resistant potential of PVA/LHL due to the LHL multiple nanoscale minerals.…”

Section: Resultsmentioning

confidence: 95%

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Poly(vinyl alcohol)/Laponite/Layered Double Hydroxide/Hydroxyapatite Nanocomposite Hydrogels for Stimulus-Responsive Devices

Wang,

2024

ACS Appl. Nano Mater.

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Nanocomposite hydrogels are supposed to combine the advantages of both a polymer matrix and filler. Without the use of organic additives, the incorporation of high-content inorganic nanofillers along with elevated properties remains a challenge. Accordingly, facilitated by the stepwise salting-out method, we proposed the PVA nanocomposite hydrogels containing multiple nanoscale minerals. Three kinds of nanominerals could reach certain electrostatic equilibrium, which helped to maintain their well-dispersed state even in the PVA matrix with high salinity. Unlike the traditional PVA nanocomposite hydrogels, whose mechanical properties tended to decrease upon the incorporation of inorganic fillers, the incorporation of multiple nanoscale minerals enhanced the mechanical properties including tensile strength and elongation at break. Besides, the unique multiple nanoscale mineral structure endowed our proposed nanocomposite hydrogels with high versatility, which could act as thermal insulators, flame-retardant matter, and respiration detectors. Instead of organic modification, this work innovatively utilizes intrinsic inorganic-to-inorganic interactions for achieving a fine nanocomposite microstructure in a polymer matrix. Our proposed nanocomposite hydrogels address potential applications for stimulus-responsive devices.

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Section: Resultsmentioning

confidence: 95%

“…This was indicative of incomplete combustion. 45 These phenomena indicated the superior fire-resistant potential of PVA/LHL due to the LHL multiple nanoscale minerals. On the one hand, LAP, HAP, and LDH were thermally stable and inflammable.…”

Section: Thermal Insulatingmentioning

confidence: 99%

Poly(vinyl alcohol)/Laponite/Layered Double Hydroxide/Hydroxyapatite Nanocomposite Hydrogels for Stimulus-Responsive Devices

Wang,

2024

ACS Appl. Nano Mater.

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“…The total smoke production (TSP) of GP5-PUE and GN5-PUE is more than that of B5-PUE, which may be mainly attributed to the rapid generation of protective layer during the forced combustion process in CCT, so only small molecules (CO, CO 2 ) can easily pass through the protective layer into the gas phase. [42,45,49] In the case of B5-PUE, both the macromolecules (alkanes, ester) and small molecules (CO, CO 2 ) produced by decomposition of main chain released into the air. Because of the different smoke components, the TSP and char residual of GP5-PUE and GN5-PUE are higher than that of B5-PUE.…”

Section: Burning Behaviors Of Puesmentioning

confidence: 99%

“…In our previous work, we found that GA was able to increase the LOI value and thermal stability of PUE, but it could not well improve the melting drop phenomenon during combustion due to its simple chemical structure. [42] Along this line, we has prepared two bio-based flame retardants: phosphorus-modified GA (GAP) and nitrogen-modified GA (GAN). GAP or GAN as cross-linking agent reacts with the polyurethane prepolymer E95C to obtain GP-PUEs and GN-PUEs with good flame retardant and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Modified Gallic Acids as Both Reactive Flame Retardants and Cross‐Linkers for the Fabrication of Flame‐Retardant Polyurethane Elastomers

Wang,

Zhou,

et al. 2023

ChemistrySelect

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Polyurethane elastomers (PUEs) serve a vital role in our daily life and various industrial applications, but their flammability has been proven to be a significant drawback. In this work, we have successfully fabricated two modified gallic acids (GAP and GAN) by simple esterification, both of which are effective flame retardants and cross‐linkers for PUEs. According to thermogravimetric analysis (TGA) and limiting oxygen index (LOI) tests, the introduction of GAP and GAN conspicuously improves the char yield (4.9~5.8 wt.%) and LOI value of PUEs (33~35 %). The cone calorimetry tests suggest that the peak heat release rate (PHRR) and total heat release (THR) of PUE decrease significantly, while the fire performance index (FPI) value increase after GAP or GAN modification. Both GAP and GAN enhance the density and strength of carbon residues, and inhibit the generation of combustible volatile gas during the combustion process, thereby improving the fire safety of PUEs. In addition, both GAP and GAN contain multiple benzene rings and hydrogen bonding, which can improve the cross‐linking density of PUEs to enhance their mechanical properties (the elongation at break: 844~951 %; tensile strength: 6.37~8.13 MPa).

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“…[29][30][31] TA comprises a multitude of phenolic hydroxyl groups that not only promote hydrogen bonding interactions with the polyurethane backbone but also serve as metal ligands via metalphenol coordination. [32][33][34] Liu et al introduced TA and Fe 3+ into WPU emulsions in a two-step reaction, wherein the dynamic phenol-carbamate bond and Fe 3+ -catechol coordination bond constructions endowed WPU with exceptional self-healing properties. 29 Therefore, the incorporation of TA and Fe 3+ into polyrotaxane-based WPU holds considerable potential in realizing a synergistic amalgamation of exceptional self-healing capabilities and superior mechanical properties within an environmentally sustainable supramolecular WPU system.…”

Section: Introductionmentioning

confidence: 99%

Polyrotaxane‐modified waterborne polyurethane based on H‐bonding and metal bonding with mechanically tough and self‐healability

Ren,

Wu,

et al. 2023

J of Applied Polymer Sci

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The pulley structure has been widely employed to improve mechanical properties. Polyrotaxane‐based waterborne polyurethane (WPU) typically exhibits good tensile strength and Young's modulus. However, achieving outstanding self‐healability of polyrotaxane‐based WPU under mild conditions generally proves insufficient solely relying on host‐guest interactions. Herein, a strategy that constructs a triple synergy of host‐guest interaction, hydrogen bonds, and metal coordination bonds by sequentially introducing tannic acid (TA) and Fe3+ is proposed to prepare polyrotaxane‐based WPU with excellent mechanical performance and high self‐healable capability. Besides the reversible non‐covalent bonding contributing to intrinsic self‐healing, the unique sliding motion of WPU's molecule chain acts as a driving force, promoting efficient contact among reversible bonds. Notably, benefiting from the sliding motion of β‐cyclodextrin (β‐CD) along a chain, the dynamic reconstruction of hydrogen bonds and metal coordination bonds, the resulting supramolecular WPU exhibited a tensile strength of 46.05 MPa and a toughness of 130.30 MPa, with satisfactory self‐healing performance (tensile strength healing efficiency of more than 95%). This work enriches the self‐healing mechanism and expands the concepts for the design of resilient self‐healing environmentally friendly supramolecular WPU.

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Tannic acid as cross-linker and flame retardant for preparation of flame-retardant polyurethane elastomers

Cited by 17 publications

References 74 publications

Poly(vinyl alcohol)/Laponite/Layered Double Hydroxide/Hydroxyapatite Nanocomposite Hydrogels for Stimulus-Responsive Devices

Poly(vinyl alcohol)/Laponite/Layered Double Hydroxide/Hydroxyapatite Nanocomposite Hydrogels for Stimulus-Responsive Devices

Modified Gallic Acids as Both Reactive Flame Retardants and Cross‐Linkers for the Fabrication of Flame‐Retardant Polyurethane Elastomers

Polyrotaxane‐modified waterborne polyurethane based on H‐bonding and metal bonding with mechanically tough and self‐healability

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