Graphene and poly(ionic liquid) modified polyurethane sponges with enhanced flame‐retardant properties

Wei, Huijuan; Zhu, Zhaoqi; Sun, Hanxue; Mu, Peng; Liang, Weidong

doi:10.1002/app.45477

Cited by 25 publications

(11 citation statements)

References 44 publications

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“…The oxygen index value increased from 21.3% to 25.2% because of N-Cl synergistic flame retardant effect. What's more, pure PU is highly combustible and its LOI value is only 16.7% according to the literature [26][27][28]. It can be concluded that the flame retardancy of IWPU was improved greatly compared with pure PU.…”

Section: Loi Testsmentioning

confidence: 95%

A Novel Polymer Electrolyte Matrix Incorporating Ionic Liquid into Waterborne Polyurethane for Lithium-Ion Battery

et al. 2020

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Ionic liquid has relatively high conductivity at room temperature and good electrochemical stability. Ionic liquid polymer electrolytes have some advantages of both ionic liquid and polymer. In this work, 1-alkyl-3-(2′,3′-dihydroxypropyl)imidazolium chloride (IL-Cl) was incorporated into waterborne polyurethane chain to composite all-solid-state polymer electrolyte matrices. The structure, thermal stability, mechanical property and ionic conductivity of the matrices were investigated by Fourier transform infrared spectroscopy (FTIR), thermogravimetric Analysis (TGA), tensile measurement and electrochemical impedance spectroscopy (EIS). The results demonstrated that when the content of IL-Cl was 14 wt%, the mechanical property of film was optimized, with a maximum tensile strength of 36 MPa and elongation at break of 1030%. In addition, as for the film with IL-Cl content of 16 wt%, its oxygen index value increased to 25.2% and ionic conductivity reached a maximum of 1.2 × 10−5 S·cm−1 at room temperature, showing high flame retardancy and ionic conductivity.

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Section: Loi Testsmentioning

confidence: 95%

A Novel Polymer Electrolyte Matrix Incorporating Ionic Liquid into Waterborne Polyurethane for Lithium-Ion Battery

et al. 2020

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“…Based on these two reasons, the sample is beneficial for suppressing the progress of the combustion reaction and achieving an excellent flame‐retardant effect. In addition, the formation of an intumescent char layer provides a strong protective barrier (condensed‐phase flame retardancy) that arrests the contact of oxygen and the heat transfer, thereby preventing further burning of the substrate material …”

Section: Resultsmentioning

confidence: 99%

“…In addition, the formation of an intumescent char layer provides a strong protective barrier (condensed-phase flame retardancy) that arrests the contact of oxygen and the heat transfer, thereby preventing further burning of the substrate material. [42][43][44] FTIR analysis was also conducted to confirm the structure of the residue chars for carbonized ACPM-1 obtained from the torch burn test, and the results are shown in Figure 11. For ACPM-1, comparing the spectra of the sample before and after the combustion, we found that the characteristic peaks remain basically unchanged.…”

Section: Resultsmentioning

confidence: 99%

Facile preparation of attapulgite‐based aerogels with excellent flame retardancy and better thermal insulation properties

Liang

Wang

et al. 2019

J of Applied Polymer Sci

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A novel and environmentally friendly attapulgite‐based aerogel with a three‐dimensional fibrillary network structure was prepared by incorporation of nanometer‐sized natural clay crystals, in this case attapulgite (ATP), into degradable poly(vinyl alcohol) (PVA), cotton cellulose nanowhisker, and melamine using only a simple blending method and subsequently a freeze‐drying process. The ATP‐based aerogel exhibits an abundant porosity with an average mesopore size of 8.0 nm in diameter. Compared to fragile and rigid inorganic aerogels, the as‐prepared aerogel shows good flexibility and mechanical strength with a compressive strength of 9.65 × 104 Pa and 10.19 × 104 Pa at 20% and 40% of compressive strain, respectively. The limiting oxygen index (LOI) and vertical flame tests show that the resulting aerogel possesses excellent flame retardancy, with an LOI of 59.5%. Microcalorimetry test results show that the total heat release of the aerogel is as low as 5.1 KJ/g. Also, the sample shows a better thermal insulation property, with a thermal conductivity of about 0.045 W m−1 K−1 in air. Taking advantage of a simple and environmentally friendly fabrication, abundant natural clay resources, easy scalability, nearly no pollution emission in the process, and cost‐efficient production, the ATP‐based aerogel has great potential as ideal flame retardant and thermal insulation materials for many applications such as modern building construction or energy‐efficient coatings. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47849.

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“…With the introduction of the concept of green chemistry, an upsurge in ILs research has gradually formed around the world. There are three main types of ILs used for flame retardant: use alone, 27,28 compound with traditional flame retardants, 29 and modify flame retardant and combine with traditional flame retardant 30,31 . When the ILs are used alone or combined with traditional flame retardants, the flame retardancy of the polymer is not ideal, while it modifying flame retardant and combining with traditional flame retardant is of great effect.…”

Section: Introductionmentioning

confidence: 99%

Ionic liquid modified graphene oxide for enhanced flame retardancy and mechanical properties of epoxy resin

Wan

Shen

Sun

et al. 2021

J of Applied Polymer Sci

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In this work, to improve its dispersion and flame retardancy, graphene oxide (GO) was functionalized by silane coupling agent KH550 and 1‐butyl‐3‐methylimidazole hexafluorophosphate (PF6‐ILs), and characteristics of the PF6‐ILs@GO was obtained by transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), and thermogravimetric analysis (TGA). Then, the synergistic flame retardant of GO or PF6‐ILs@GO and melamine pyrophosphate (MPP) were applied for epoxy resin (EP) materials. Specifically, the limiting oxygen index (LOI) value of EP with 0.1 wt% PF6‐ILs@GO was increased to 29.2% from 27.5% of EP/MPP composites, and the UL‐94 test reached the V‐0 rating. The CCT results showed that the total heat release (THR) and total smoke release (TSP) of EP/MPP/PF6‐ILs@GO composites were significantly 24.4% and 53.4% lower than that of EP/MPP composites. Besides, the thermal behavior investigated by TGA indicated that the char‐forming effect of GO and PF6‐ILs@GO was great, the residual char of EP/MPP/PF6‐ILs@GO composites was as high as 19.5% at 700°C, and its thermal stability was higher than that of EP/MPP composites. On the other hand, the tensile strength of EP/MPP/GO and EP/MPP/PF6‐ILs@GO composites were increased by 15.6% and 28.3% compared with EP/MPP composites. According to SEM analysis, the EP/MPP/GO composites formed a good protective char layer, which can effectively improve flame retardancy of EP. This research represents a new method of flame retardant modified GO to improve the flame retardancy and mechanical properties of polymers.

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Graphene and poly(ionic liquid) modified polyurethane sponges with enhanced flame‐retardant properties

Cited by 25 publications

References 44 publications

A Novel Polymer Electrolyte Matrix Incorporating Ionic Liquid into Waterborne Polyurethane for Lithium-Ion Battery

A Novel Polymer Electrolyte Matrix Incorporating Ionic Liquid into Waterborne Polyurethane for Lithium-Ion Battery

Facile preparation of attapulgite‐based aerogels with excellent flame retardancy and better thermal insulation properties

Ionic liquid modified graphene oxide for enhanced flame retardancy and mechanical properties of epoxy resin

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