Nacre-inspired hemicelluloses paper with fire retardant and gas barrier properties by self-assembly with bentonite nanosheets

Huang, Chen; Fang, Guigan; Tao, Yuheng; Meng, Xianzhi; Yan, Lin; Bhagia, Samarthya; Wu, Xinxing; Yong, Qiang; Ragauskas, Arthur J.

doi:10.1016/j.carbpol.2019.115219

Cited by 42 publications

(16 citation statements)

References 43 publications

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“…Based on the above discussion, the flame retardant mechanism of AVOPh in PVA composites is shown in Figure 5. First, 2D layered nanosheets evenly dispersed in PVA matrix, which can serve as a parclose blocking mass transmission when the composites were lit due to external heat 30–32 . Second, in gas phase, AVOPh decomposes thermally to release crystal water and NH 3 , absorbing heat and diluting oxygen concentration around the burning matrix.…”

Section: Resultsmentioning

confidence: 99%

Suppressing fire hazard of poly(vinyl alcohol) based on (NH₄)₂[VO(HPO₄)]₂(C₂O₄)·5H₂O with layered structure

Zhu

Chen

Huang

et al. 2021

J of Applied Polymer Sci

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Two‐dimensional layered ammonium vanadium oxalate‐phosphates (AVOPh) with the structural formula of (NH4)2[VO(HPO4)]2(C2O4)·5H2O are synthesized though a hydro‐thermal method, which is dispersed into poly(vinyl alcohol) (PVA) matrix to prepare PVA/AVOPh composites. The results of thermal analysis indicate that AVOPh and PVA have similar decomposition temperature from 280 to 500°C, which is critical for choosing flame retardant. The incorporation of AVOPh significantly improves the thermal stability and flame retardancy of PVA/AVOPh composites that the T5% value of PVA/2 wt% AVOPh composites is up to 215°C, and the residue of PVA/8 wt% AVOPh composites is enhanced to 16.9%, while those of pure PVA are only 178°C and 2.4%. PVA/4 wt% AVOPh composites can pass V‐0 level, and its limiting oxygen index value is up to 32.0%. Furthermore, the peak heat release rate (PHRR) and total heat release (THR) of PVA/AVOPh composites are obviously decreased, which reduced by 43.4% and 43.8% with the addition of 4 wt% AVOPh, compared with those of pure PVA. The excellent thermal stability and flame retardancy are mainly attributed to the uniform dispersion and barrier effect of 2D layered AVOPh, the release of crystal water, ammonia and phosphorus free radicals and the two‐phase flame retardant catalytic mechanism of vanadium and phosphorus.

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Section: Resultsmentioning

confidence: 99%

Suppressing fire hazard of poly(vinyl alcohol) based on (NH₄)₂[VO(HPO₄)]₂(C₂O₄)·5H₂O with layered structure

Zhu

Chen

Huang

et al. 2021

J of Applied Polymer Sci

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“…The CMC spectrum can be fitted with three peaks at bending energies at 284.85, 286.32, 287.86 eV [ 37 ], which can be assigned to C–C/C=C, C–O, C–O–C bonds, respectively. Peaks for C–O and C–O–C in the CMC/GO aerogel (286.48 and 288.07 eV, respectively) and the L-CMC/GO aerogel (286.30 and 287.78 eV, respectively) experienced apparent variations, indicating a strong interaction between CMC, GO and the crosslinker [ 38 ]. After treatment, the peaks for C–O of L-CMC/rGO aerogel (reduced after curing at 105 °C for 12 h) suffered an obvious decrease, which may be caused by the GO reduction process at high temperature.…”

Section: Resultsmentioning

confidence: 99%

Directionally-Grown Carboxymethyl Cellulose/Reduced Graphene Oxide Aerogel with Excellent Structure Stability and Adsorption Capacity

et al. 2020

Self Cite

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A novel three-dimensional carboxymethyl cellulose (CMC)/reduced graphene oxide (rGO) composite aerogel crosslinked by poly (methyl vinyl ether-co-maleic acid)/poly (ethylene glycol) system via a directional freezing technique exhibits high structure stability while simultaneously maintaining its excellent adsorption capacity to remove organic dyes from liquid. A series of crosslinked aerogels with different amounts of GO were investigated for their adsorption capacity of methylene blue (MB), which were found to be superb adsorbents, and the maximum adsorption capacity reached 520.67 mg/g with the incorporation of rGO. The adsorption kinetics and isotherm studies revealed that the adsorption process followed the pseudo-second-order model and the Langmuir adsorption model, and the adsorption was a spontaneous process. Furthermore, the crosslinked aerogel can be easily recycled after washing with dilute HCl solution, which could retain over 97% of the adsorption capacity after recycling five times. These excellent properties endow the crosslinked CMC/rGO aerogel’s potential in wastewater treatment and environment protection.

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“…[ 37 ] According to the EDS results (Figure 6d), MMT and PI are uniformly distributed on the surface and the absence of obvious phase separation between them. [ 38 ] The edges between MMT sheets are blurred, indicating that the MMT sheets combined closely and covered by PI. This can greatly reduce defects (gaps or cracks) and thus enhance the gas barrier properties of the materials.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Nacre‐Like Polyimide/Montmorillonite Composite Films with Excellent Water Vapor Barrier Properties by Gravity‐Induced Deposition

Zhu

et al. 2020

Adv Materials Inter

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Polymers are ideal materials for preparing flexible barrier films because of their flexibility and other outstanding comprehensive properties. However, the gas barrier performance of polymer is far from meeting the requirements of flexible electronics encapsulation and its technology is still very challenging. In this study, by imitating the “brick‐mortar” structure of nacres, the nacre‐like composites made by polyimide (PI) and montmorillonites (MMTs) are successfully prepared by gravity‐induced deposition. These composite films exhibit excellent water vapor barrier performance even under high humidity conditions. The water vapor transmission rate of the best composite film (PNC50) is 0.023 g m−2 day−1, which is 3 orders of magnitude lower than that of pure PI. Mechanism studies are carried out by the help of carbon quantum dots, which could “lighting up” the MMTs and thus directly reflect the dispersion state of MMT in the composite films. With a fluorescence confocal microscopy, it can be observed that MMTs are evenly arranged on the surface, effectively blocking the entry of water vapor; moreover, the dense laminated structure of MMTs can prevent the diffusion of water vapor, all of which are beneficial to improve the water vapor barrier property of the composite films.

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Nacre-inspired hemicelluloses paper with fire retardant and gas barrier properties by self-assembly with bentonite nanosheets

Cited by 42 publications

References 43 publications

Suppressing fire hazard of poly(vinyl alcohol) based on (NH₄)₂[VO(HPO₄)]₂(C₂O₄)·5H₂O with layered structure

Suppressing fire hazard of poly(vinyl alcohol) based on (NH₄)₂[VO(HPO₄)]₂(C₂O₄)·5H₂O with layered structure

Directionally-Grown Carboxymethyl Cellulose/Reduced Graphene Oxide Aerogel with Excellent Structure Stability and Adsorption Capacity

Preparation of Nacre‐Like Polyimide/Montmorillonite Composite Films with Excellent Water Vapor Barrier Properties by Gravity‐Induced Deposition

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Nacre-inspired hemicelluloses paper with fire retardant and gas barrier properties by self-assembly with bentonite nanosheets

Cited by 42 publications

References 43 publications

Suppressing fire hazard of poly(vinyl alcohol) based on (NH4)2[VO(HPO4)]2(C2O4)·5H2O with layered structure

Suppressing fire hazard of poly(vinyl alcohol) based on (NH4)2[VO(HPO4)]2(C2O4)·5H2O with layered structure

Directionally-Grown Carboxymethyl Cellulose/Reduced Graphene Oxide Aerogel with Excellent Structure Stability and Adsorption Capacity

Preparation of Nacre‐Like Polyimide/Montmorillonite Composite Films with Excellent Water Vapor Barrier Properties by Gravity‐Induced Deposition

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Suppressing fire hazard of poly(vinyl alcohol) based on (NH₄)₂[VO(HPO₄)]₂(C₂O₄)·5H₂O with layered structure

Suppressing fire hazard of poly(vinyl alcohol) based on (NH₄)₂[VO(HPO₄)]₂(C₂O₄)·5H₂O with layered structure