A review of flame retardant nanocoatings prepared using layer-by-layer assembly of polyelectrolytes

Holder, Kevin M.; Smith, Ryan; Grunlan, Jaime C.

doi:10.1007/s10853-017-1390-1

Cited by 170 publications

(135 citation statements)

References 174 publications

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“…The decomposition temperature around 500 °C of HNTs‐PUF decreases as the increase in the HNT concentration. This peak is related to the dehydration of the hydroxyl groups on the surface of the nanotubes . The decrease may be due to the dehydration of the PU degradation product and HNTs.…”

Section: Resultsmentioning

confidence: 97%

“…HNT coating can interrupt the thermal degradation of the PUF by providing an insulating shield and prevent flammable degradation materials from spilling into the flame zone. The flame eventually gets extinguished because there is no fuel that can be burned . The aluminum‐containing hydroxide of HNTs can release water at high temperature, which is an endothermic process that releases water vapor to dilute the combustible gas and suppresses the release of toxic fumes, thereby increasing the flame retardancy of PUF …”

Section: Resultsmentioning

confidence: 99%

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Two in One: Modified Polyurethane Foams by Dip‐Coating of Halloysite Nanotubes with Acceptable Flame Retardancy and Absorbency

Zheng

et al. 2019

Macro Materials & Eng

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Poor flame retardancy of polyurethane foam (PUF) limits its practical application in many fields. Here, flame‐retardant performance of PUF is improved by a simple dip‐coating method. Halloysite nanotube (HNT) coating can be uniformly bonded to PUF surfaces via hydrogen‐bonding interactions, which is confirmed by element mapping and X‐ray photoelectron spectra. Density and mechanical properties of PUF increase with the concentration of HNT suspension, while porosity of the foam decreases with HNT loading. Weight ratio of HNTs to PUF in the composite can be achieved as high as 65.2%. Surfaces of PUF transfer from hydrophobic to super‐hydrophilic after HNT coating, and the water contact angle decreases from 116° to 0° after HNT coating. As a result, methylene blue adsorption capacity of HNTs‐coated PUF increases from 0.02 to 0.15 mg g−1, and adsorption efficiency can reach 98% after 10 s. HNT coating can prevent PUF from burning and dripping, which suggests that flame‐retardant performance of PUF is significantly improved by HNTs. This work establishes a general procedure for improving flame retardancy and dye absorbency of polymer materials by simple dip‐coating of environmental‐friendly clay nanotubes, which shows great potential in high‐performance polymer and functional composite materials.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Two in One: Modified Polyurethane Foams by Dip‐Coating of Halloysite Nanotubes with Acceptable Flame Retardancy and Absorbency

Zheng

et al. 2019

Macro Materials & Eng

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“…All of the images indicate that the multilayer coatings conformally coat the walls and conserve the open porous structure of PUF. The ability to uniformly coat complex substrates without changing porosity (or texture) is one of the biggest advantages of the LbL technique . At high magnification, the surface of the uncoated foam is very smooth, while the coated foam has an irregular surface that confirms the presence of the coatings.…”

Section: Resultsmentioning

confidence: 99%

“…The ability to uniformly coat complex substrates without changing porosity (or texture) is one of the biggest advantages of the LbL technique. [9] At high magnification, the surface of the uncoated foam is very smooth, while the coated foam has an irregular surface that confirms the presence of the coatings. A textured surface can be observed for the foam samples coated with intumescent multilayers (without KAO), as shown in Figure 3b.…”

Section: Multilayer Film Growth and Morphologymentioning

confidence: 88%

“…[7] Halogen-free multilayer nanocoatings have shown great effectiveness in improving fire performance of highly flammable substrates. [8,9] These thin films are commonly fabricated through alternate deposition of cationic and anionic polyelectrolytes via electrostatic interactions. This layer-by-layer (LbL) assembly process is easy to use, relatively environmentally benign and very effective.…”

Section: Doi: 101002/mame201800531mentioning

confidence: 99%

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Combination Intumescent and Kaolin‐Filled Multilayer Nanocoatings that Reduce Polyurethane Flammability

Liu

Qin

et al. 2018

Macro Materials & Eng

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Chitosan (CH), ammonium polyphosphate (APP), CH and poly(acrylic acid) (PAA)‐stabilized kaolin (KAO) clay are deposited as quadlayers onto the surface of flexible polyurethane foam (PUF) via layer‐by‐layer assembly in order to improve the fire resistance of the foam. The effectiveness of this nanocoating on flame suppression is compared to control films without KAO and bilayer coatings. PUF coated with only five CH/APP/CH/PAA‐KAO quadlayers (around 184 nm thick) maintains its open porous structure and self‐extinguishes upon exposure to a butane torch flame for 10 s. Cone calorimetry reveals that this coating reduces the peak heat release rate and total smoke release by 66.8% and 59.3%, respectively, compared with uncoated foam. Thermogravimetric analysis under nitrogen indicates the combination of intumescent components and clay promotes char formation and improves the thermal stability of the polyurethane substrate. This multilayer coating has the potential to improve the fire safety for PUF, commonly used in home furnishings, and a variety of other polymeric substrates.

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Fire Retardants from Renewable Resources

Xia

Kiratitanavit

et al. 2018

Advanced Green Composites

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A review of flame retardant nanocoatings prepared using layer-by-layer assembly of polyelectrolytes

Cited by 170 publications

References 174 publications

Two in One: Modified Polyurethane Foams by Dip‐Coating of Halloysite Nanotubes with Acceptable Flame Retardancy and Absorbency

Two in One: Modified Polyurethane Foams by Dip‐Coating of Halloysite Nanotubes with Acceptable Flame Retardancy and Absorbency

Combination Intumescent and Kaolin‐Filled Multilayer Nanocoatings that Reduce Polyurethane Flammability

Fire Retardants from Renewable Resources

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