Cellulose-based composite thermal-insulating foams toward eco-friendly, flexible and flame-retardant

Jiang, Shuai; Zhang, Meiling; Li, Mengmeng; Zhu, Jianhua; Ge, Aixiong; Liu, Lifang; Yu, Jianyong

doi:10.1016/j.carbpol.2021.118544

Cited by 50 publications

(24 citation statements)

References 30 publications

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“…It should be noted that the 44.2% LOI for 1.5 wt% MEL–PA/CNF composite aerogel is higher than previously reported fire‐retardant cellulose‐based aerogel, such as cellulose aerogel modified with MgAl‐layered double hydroxide (36.3%), [ 7 ] cellulose nanofibrils aerogel modified with N ‐methylol dimethylphosphonopropionamide (26.3%), [ 36 ] MoS 2 encapsulated cellulose nanofibers aerogel (34.7%), [ 16 ] and boric acid/borate/alginate‐modified cellulose nanofibers foam (39.5%). [ 37 ] The flame retardancy of the 1.0 wt% MEL–PA composite aerogel was also visually demonstrated by burning with a butane torch with approximate temperature of 1430 °C. As compared to the unmodified CNF aerogel that can be immediately ignited and quickly burned to ash (Figure 5b,d), the modified CNF aerogel exhibited excellent fire retardancy (Figure 5c), only showing the formation of charred layer without any flame (Figure 5d).…”

Section: Resultsmentioning

confidence: 99%

Fire‐Retardant and Thermal‐Insulating Cellulose Nanofibril Aerogel Modified by In Situ Supramolecular Assembly of Melamine and Phytic Acid

et al. 2022

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The widespread utilization of cellulose nanofibril (CNF) has been significantly hindered by its inherent flammability. To explore the potential of using CNF aerogel as sustainable material with good fire‐retardant and thermal‐insulating properties, CNF aerogel is modified by in situ supramolecular assembly of melamine (MEL) and phytic acid (PA). This strategy addresses CNF's flammability and avoids the environment issues associated with the incorporation of traditional fire‐retardant. The modified aerogel exhibits highly porous honeycomb structure with low density and good mechanical properties. After modification with MEL–PA, the aerogel exhibits highly improved shape integrity during burning, higher thermal stability, and favorable combustion behavior for fire retardancy. The heat transfer of the modified aerogel is well hindered, which demonstrated effective thermal insulation performance. In view of the excellent thermal and fire‐retardant properties, the MEL–PA/CNF composite aerogel can be a potential fire‐retardant and thermal‐insulating material for applications such as clothing, building, and electronic devices.

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Section: Resultsmentioning

confidence: 99%

Fire‐Retardant and Thermal‐Insulating Cellulose Nanofibril Aerogel Modified by In Situ Supramolecular Assembly of Melamine and Phytic Acid

et al. 2022

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“…The low thermal conductivity of 0.063 W/(mK) of the Cel/BT foam (30 °C, 60% RH) provides more direct evidence for its good thermal insulation (Figure D), which is comparable to that of various cellulosic aerogels (Figure S20 and Table S2). − Note that the thermal conductivity of the Cel/BT foam just increases slightly compared with the Cel foam (0.044 W/(mK)), indicating that the introduction of BT in the cellulose structure does not result in significant degradation in the thermal insulation performance. This phenomenon is reasonable as the interaction between cellulose and BT helps stabilize the 3D interconnected structure without collapse (i.e., numerous pores exist in the Cel/BT foam).…”

Section: Resultsmentioning

confidence: 99%

Scalable Production of Biodegradable, Recyclable, Sustainable Cellulose–Mineral Foams via Coordination Interaction Assisted Ambient Drying

Chen

Wang

et al. 2022

ACS Nano

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Heavy reliance on petrochemical-based plastic foams in both industry and society has led to severe plastic pollution (the so-called “white pollution”). In this work, we develop a biodegradable, recyclable, and sustainable cellulose/bentonite (Cel/BT) foam material directly from resource-abundant natural materials (i.e., lignocellulosic biomass and minerals) via ambient drying. The strong resistance to the capillary force-driven structural collapse of the preformed three-dimensional (3D) network during the ambient drying process can be ascribed to the purpose-designed cellulose–bentonite coordination interaction, which provides a practical way for the locally scalable production of foam materials with designed shapes without complex processing and intensive energy consumption. Benefiting from the strong cellulose–bentonite coordination interaction, the Cel/BT foam material demonstrates high mechanical strength and outstanding thermal stability, outperforming commercial plastic polystyrene foam. Furthermore, the Cel/BT foam presents environmental impacts much lower than those of petrochemical-based plastic foams as it can be 100% recycled in a closed-loop recycling process and easily biodegraded in the environment (natural cellulose goes back to the carbon cycle, and bentonite minerals return to the geological cycle). This study demonstrates an energy-efficient ambient drying approach for the local and scalable production of an all-natural cellulose/bentonite foam for sustainable packaging, buildings, and beyond, presenting great potential in response to “white pollution” and resource shortage.

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“…Studying the mechanical behavior of cellulose foams is crucial for understanding how the material will behave in different applications . Elastic modulus, compressive strength, and energy absorption capacity are important properties in foamed materials, especially in applications such as shock absorption for the protection of fragile products …”

Section: Resultsmentioning

confidence: 99%

“…Studying the mechanical behavior of cellulose foams is crucial for understanding how the material will behave in different applications. 26 Elastic modulus, compressive strength, and energy absorption capacity are important properties in foamed materials, especially in applications such as shock absorption for the protection of fragile products. 27 Regarding the mechanical performance of the prepared foams, all of them exhibited elastoplastic behavior, as can be observed from the stress−strain curves shown in Figure 2a.…”

Section: ■ Introductionmentioning

confidence: 99%

Cellulose–Chitosan Biodegradable Materials for Insulating Applications

Lujan

Goñi

Martini

2022

ACS Sustainable Chem. Eng.

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Bio-based lightweight porous materials have attracted attention due to their unique properties and have become an interesting alternative to petroleum-based foams such as expanded polystyrene (EPS) and polyurethane foams. In this work, biodegradable cellulose pulp−chitosan foams were obtained through a low-cost, simple, and scalable method. A full factorial design was carried out to study the effects of three experimental factors (chitosan content, foaming agent concentration, and foaming time) on apparent density and mechanical properties. The prepared foams displayed low apparent densities (0.06−0.12 g/cm 3 ), good mechanical performance (elastic modulus: 0.18−1.20 MPa, compressive strength: 0.02−0.11 MPa), excellent thermal insulation properties (thermal conductivities: 0.03−0.04 W/mK), and high biodegradation rates. The increase of chitosan content improved the water resistance and mechanical strength. Finally, these materials could be suitable for several applications in which thermal insulation, mechanical resistance, and water stability are crucial, including packaging and construction, as an alternative to traditional nonbiodegradable materials.

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Cellulose-based composite thermal-insulating foams toward eco-friendly, flexible and flame-retardant

Cited by 50 publications

References 30 publications

Fire‐Retardant and Thermal‐Insulating Cellulose Nanofibril Aerogel Modified by In Situ Supramolecular Assembly of Melamine and Phytic Acid

Fire‐Retardant and Thermal‐Insulating Cellulose Nanofibril Aerogel Modified by In Situ Supramolecular Assembly of Melamine and Phytic Acid

Scalable Production of Biodegradable, Recyclable, Sustainable Cellulose–Mineral Foams via Coordination Interaction Assisted Ambient Drying

Cellulose–Chitosan Biodegradable Materials for Insulating Applications

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