Coatings
·
2023
·Vol. 13
·期 4
·733
·
IF 3.4
Meizhu Qin,Xinping Hu,Jingyan Guo
Polystyrene (PS) is a widely used building insulation material with good mechanical strength and strong temperature adaptability. However, PS itself is highly flammable and displays poor flame retardancy. At present, building fires caused by organic external wall thermal insulation materials prepared from PS represent a new fire hazard. In this study, the addition of an intumescent flame retardant (IFR) to reduce the flammability of PS was achieved. Using melamine (MEL), acrylonitrile-styrene-acrylate (ASA), and phytic acid (PA) as raw materials, a new type of flame retardant (MAP) was prepared by an electrostatic self-assembly method and was introduced to modify PS. Its effect on the flammability of PS composites was also investigated. The flammability of the PS composites was characterized using the limiting oxygen index (LOI) and vertical combustion. The effect of MAP on the morphology of the carbon layer formed from polymer decomposition was studied using scanning electron microscopy (SEM). By adding MAP to a PS/20%N-IFR flame-retardant composite, the flame-retardant property was significantly improved, the limiting oxygen index reached 37, and the vertical combustion reached a V-0 level. The fire performance index (FPI) of the PS/20%N-IFR composite reached 0.0054, which was significantly higher than that of the control PS (0.037) as determined by the cone calorimetry test. The SEM results showed that the introduction of MAP can increase the density of the carbon layer after combustion. The heat release rate for combustion was reduced. In addition, the mechanical properties of the PS/20%N-IFR composites were compared with those with no flame retardant. The tensile strength of the PS/20%N-IFR composite was 26.1 MPa and the elongation of the PS/20%N-IFR composite remained at 2.2%. The PS/20%N-IFR composite displayed better flame retardancy than the untreated material and good mechanical properties. The presence of MAP prevented the heat and oxygen transfer and interrupted the releasing of flammable products, thus protecting the PS from burning. This flame-retardant material may find broad applications in building insulation materials.Keywords:intumescent flame retardant;polystyrene;insulation materials
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Guangxu Ju,Danqian Wang,Yingzi Gu,Weining He,Yiming Niu,Guoxing Sun
Good thermal insulation performance is crucial for the application of cement materials, and reducing thermal conductivity is an effective strategy to enhance thermal insulation performance. Thermosensitive poly-N-isopropylacrylamide (PNIPAM) undergoes a phase transition around its lower critical solution temperature (LCST) of approximately 32 °C, and its incorporation can significantly improve the thermal insulation properties of cement. This study investigates the effects of adding PNIPAM in concentrations ranging from 0.3 % to 1.5 % on the thermal conductivity of cement-based materials at temperatures of 25 °C, 32 °C, and 37 °C. At 37 °C, the thermal conductivity of the cement sample decreased from 1.728 W/m·K to 0.811 W/m·K, representing a substantial reduction of 53.05 %. However, increasing the PNIPAM content also affected the hydration process of the cement mortars, leading to longer initial and final setting times and a slight decrease in both compressive and flexural strength. Additionally, the viscosity of the PNIPAM solution increased the overall viscosity of the cement mortar, resulting in reduced fluidity.
研究领域:
建筑材料学
·
热物理
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Lei Zhao,Hongyan Wu,Wenling Jiao,Xia Yin,Yang Si,Jianyong Yu,Bin Ding
Health risks are more likely to occur in cold environments, making warm equipment highly in demand. Fluffy fibrous sponge obtained from direct electrospinning exhibited a great application prospect in heat retention fields but are often hampered by their weak mechanical stability and flammability used in high-temperature environments. How to create such materials having the robust mechanical property, flame retardancy and efficient thermal insulation simultaneously was a huge challenge. Herein, we report on a one-step method to manufacture superelastic and lightweight 3D fibrous sponge with antiflame function. The premise of this strategy is that polysulfone (PSU) can form a stable fluffy structure in a high-humidity environment, while polyurethane (PU) can absorb deformation energy caused by external forces. By adding OP-100A, the carbonization speed of PSU/PU fibrous sponge was increased and the antiflaming property was improved. Thanks to the polymer combination strategy, the fibrous sponge prepared has excellent tensile properties with the elongation at break reaching 160%, and unique elastic energy of compression with almost no plastic deformation after 100 compressions tests. Furthermore, the fibrous sponge also has obvious advantages in ultralight property, flame retardant property and heat retention property. The successful preparation of fibrous sponge opens a new way for the development of superelastic, lightweight, and flame-retardant heat retention materials.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 13
·8693-8704
·
IF 5.044
Chen Yu,Yang Shuanghong,Qiu Zhiwei,Li Yuqi,Qiu Fengxian,Zhang Tao
In the view of sustainable development and environmental protection, degradable agricultural films with on-demand thermal insulation properties have attracted growing research interest in the last few decades due to the deteriorating environment and extreme climate on the growth and existence of crops. Here, a general strategy has been developed to fabricate degradable silver nanowires modified cellulose (AgNW/cellulose) hybrid film with controllable thermal insulation and antibacterial properties by using plant cellulose and AgNWs as building blocks, PVA and PEG as film forming solvent, as well as their agriculture application. The results show that the AgNWs are evenly dispersed in the three-dimensional grid of cellulose, that they form a film that can withstand a certain tensile force and have good thermal stability. Due to the excellent electrical conductivity, the AgNW/cellulose hybrid films can provide excellent Joule heating, generating rapid thermal response and uniform electrical heating at a low supply voltage of 3 V. In the antibacterial tests against Escherichia coli and Staphylococcus aureus, the AgNW/cellulose hybrid films exhibited large diameters of inhibition zones, revealing the high antibacterial activity. Additionally, the AgNW/cellulose hybrid films showed highly stretchable behavior by delivering a breaking strain of 1.5% with a tensile stress of 0.45 MPa owing to the cross-linked structures of cellulose and AgNWs. Based on the above properties, this study not only provides a potential strategy for the fabrication of flexible and biodegradable agricultural films but also may provide new insights for agricultural thermal management.
研究领域:
材料科学
·
农业科学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY
·
2025
·
IF 6.6
Huageng Dai,Jianjuan Yuan,Caimeng Zhao,Xiangfei Kong
Long-distance district heating pipelines exposed to the ground for extended periods experience significant heat loss. The application of flexible phase-change composite materials with a photothermal conversion function offers a novel approach to coupling heating pipes with phase-change heat storage, utilizing solar energy for insulation. In this study, melamine foam serves as the supporting skeleton, erythritol as the phase change material, and polydopamine as the light-absorbing material. The composite phase change material exhibits a thermal conductivity of 0.04574 W/m·K, an enthalpy of 357.6 J/g, a melting peak at 121.9 °C and an average photothermal conversion efficiency of 63.82 %. The simulation results show that the thermal insulation layer formed by the photothermal conversion material effectively slows the cooling rate of water within the pipe. The results of the evaluation show that if photothermal conversion material is used as insulation in the long-distance district heating pipeline in Taikoo and Lvliang cities, the daily operating cost savings would be 1,226.5 CNY/d and 2,147 CNY/d, respectively. The long-distance district heating pipeline in the two cities could offset the additional cost of photothermal conversion material over an ordinary insulation layer in 698.92 days and 886.31 days, respectively. This study provides technical support for the application of solar energy in heating pipe insulation.
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 28
·15227-15236
·
IF 11.9
Bingjie Ma,Bing Wu,Peiying Hu,Ling Liu,Jin Wang
Aerogels have recently received extensive attention owing to their excellent thermal insulation performance. Thus, they are widely used for thermal management in buildings, aerospace, pipelines, and transportation for energy saving and emission reduction. However, silica aerogels have been confirmed to possess passive radiative cooling (PRC) capacities, which may seriously retard their thermal insulation performance. Therefore, whether PRC behavior is a universal property of aerogels is an urgent problem that can determine the eventual thermal management property of aerogels. Thus, in this study, six types of aerogels with different chemical components and microstructures, including silica aerogel, boron nitride aerogel, reduced-graphene oxide aerogel, Kevlar aerogel, poly(p-phenylene-2,6-benzobisoxazole) aerogel, and polyimide aerogels, are synthesized, and their PRC and thermal management behaviors are investigated. Impressively, all the above-mentioned aerogels showed extensive PRC performance, with a sub-ambient cooling ranging from 6.6 to 11.1 °C at night, regardless of their chemical component or color, confirming the universal PRC behavior of various aerogels. The PRC also significantly affects the thermal insulation properties of the aerogels. The reasons for the PRC of aerogels have been discussed. The findings of this study can help to a comprehensive understanding of the thermal management behavior of aerogels and guide to a better way to use aerogels in the actual environment by considering their PRC.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2025
·
IF 7.7
Tiangen Feng,Zhuguang Nie,Xiaoli Guo,Xiaonan Yang,Kehe Su,Shuhua Qi,Bo Cheng
Aerogels, as currently the lightest artificial solid materials, characterized by low thermal conductivity and light weight, high porosity and high specific surface area, had gotten much attention for application of high-performance thermal insulation composites and thermal management materials. In this study, a novel thermal insulation aerogel (APP) consisting of aramid nanofibers (ANF), polyethylene glycol (PEG) and polyimide (PI) was prepared by vacuum impregnation and chemical imidization. The introduction of PI increases the interfacial thermal resistance and reduces the heat transfer rate, which results in a low thermal conductivity (0.04105W/(m/k)). Under the external environment of 200 °C, its internal temperature is only 77.4 °C. The composite aerogel exhibited excellent thermal storage capabilities, achieved a latent heat of 158.9J⋅g −1 . The porous and layered structure of the aerogel endows it low density (0.033 g/cm 3 ), excellent compression strength (583kpa) and fatigue resistance. The bifunctional elastic composite aerogel with thermal storage and insulation properties was prepared, which is an ideal candidate for next-generation thermal management materials for transportation, military and aerospace applications.
研究领域:
材料科学
·
热能工程
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2017
·Vol. 24
·期 9
·3981-3990
·
IF 3.417
Li Linfeng,Xu Weilin,Wu Xi,Liu Xin,Li Wenbin
To produce cotton fabrics with infrared-insulating properties, TiO 2 nanoparticles are uniformly and firmly coated onto the fabric using low-temperature atomic layer deposition (ALD) technology at 90 °C. Cotton fabric samples were tested and the experimental data indicated that the fabrics treated by the ALD process had excellent infrared resistance and reflection properties, with the infrared and thermal insulation rates of 67.6 and 28.5% increasing to 86.7 and 63.9%, respectively, after 2000 ALD cycles. The thickness of the fabric increased with the number of ALD cycles, as determined using a fabric thickness gauge. The fabric surface morphology and fibre cross-sections were examined using a scanning electron microscope and transmission electron microscope, respectively. Energy-dispersive X-ray spectroscopy was used to confirm that TiO 2 was the main component of the coating on the surface of cotton fabric. Beyond that, an infrared camera was used to detect the temperature of the upper and lower surfaces of the fabric and a thermal gravimetric analyser was used to show how the TiO 2 particles were deposited on the cotton fabric.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE SCIENCES
·
2022
·
IF 3.752
Shenghao Zeng,Zhoufu Wang,Yan Ma,Xitang Wang,Hao Liu,Yunjie Dong,Yueying Li,Entao Qiao,Weilun Qian
A series of lanthanum-cerium oxides with different lanthanum content were synthesized by low-temperature solid-state method, and the effect of lanthanum content on the thermal conductivity and near-infrared reflectance of lanthanum-cerium oxide ceramics was systematically investigated. The results indicated that the thermal conductivity of lanthanum-cerium oxide ceramics decreased significantly with the increase of lanthanum content, which was mainly due to the non-negligible phonon scattering caused by the increased point defects in the structure. Lanthanum-cerium oxide ceramics with different lanthanum content had high near-infrared reflectivity (82%) between 1200 and 2200 nm. The lanthanum-cerium oxide ceramics prepared in this work has lower thermal conductivity and higher near-infrared reflectivity, which has broad application prospects in the field of high-temperature energy saving as thermal insulation material.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 1
·107
·
IF 3.426
Qinqin Zhang,Xiaoqi Lin,Weisheng Chen,Heng Zhang,Dezhi Han
Many achievements have been made on the research of composite polyurethane foams to improve their structure and mechanical properties, and the composite foams have been widely utilized in building insulation and furniture. In this work, rigid polyurethane foams (RPUFs) with the addition of different fillers (nano-SiO2, peanut shell, pine bark) were prepared through the one-step method. The effects of inorganic nano-SiO2and organic biomass on foam properties were evaluated by means of physical and chemical characterization. The characterization results indicate that the compressive strength values of prepared foams could fully meet the specification requirement for the building insulation materials. The inorganic and organic fillers have no effect on the hydrogen bonding states in composite RPUFs. Furthermore, compared to the biomass fillers, the addition of nano-SiO2greatly influenced the final residual content of the fabricated foam. All composite foams exhibit closed-cell structure with smaller cell size in comparison with the parent foam. The prepared composite foams have the potential for utilization in building insulation.Keywords:rigid polyurethane foam;peanut shell;pine bark;nano-SiO2;insulation materials
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
·
2017
·Vol. 25
·期 2
·373-382
·
IF 1.624
Wang Liang,Li Zhu,Jing Qiangshan,Liu Peng
The aim of this paper is to synthesis a new type of insulation material (EPA), which fill the aerogels into the expanded perlite (EP). EP is a kind of lightweight filler, its application is constrained by the character of absorbing water easily. The silicic acid is inhaled into the expanded perlite at −0.1 MPa, aging 24 h, it becomes aerogel after solvent exchanging/surface modifying and drying. The pores of EP are filled with aerogel which affects thermal conductivity of expanded perlite little and makes it hydrophobic. EPA has a wider use than EP for its hydrophobic character. A new recipe to synthesize aerogel, filled into EP, with the thermal conductivity of 0.034 W/m K in ambient pressure drying is found in this experiment. The time and reagents dosage for synthesizing EPA are less than large block of aerogel, while the thermal conductivity is close to it. The scanning electron microscopy is used to analyze EPA’s micro structure. The thermal conductivity tester is used for testing the thermal conductivity of silica aerogel, expanded perlite and EPA.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 30
·期 3
·989-997
·
IF 2.523
Sun Weihao,Fang Yinchun,Wu Lingshuang,Liu Xinhua
Cellulose aerogel as the third generation of aerogel materials has become a hotspot. However, the poor mechanical property and dimensional stability of cellulose aerogel restrict its application. In this study, the micron down feather fibers (DFF) was used as the reinforcing material to prepare the cellulose composite aerogels by dispersion DFF in the carboxymethyl cellulose (CMC) matrix. The prepared CMC/DFF composite aerogel with low density (0.0389–0.0428 g/cm 3 ) and high porosity (about 97%). The effects of down fiber mass fraction on the mechanical and insulation properties of cellulose composite aerogel were studied. The addition of down feather fibers in the CMC aerogels could improve the mechanical property by increasing the compressive stresses at the 80% compressive strain about 75%. The CMC/DFF composite aerogels also could obtain excellent acoustic and thermal insulation properties with the sound absorption coefficient of 0.991 and thermal conductive of 0.06012 W/mK. The reinforcing mechanism of down fiber on cellulose aerogel was studied. The improvement of mechanical property of CMC aerogels by down feather fibers was due to the physical reinforcement by broadening the layers space of composite aerogels and the chemical reinforcement by forming the cross-linking system with CMC matrix and DFF through glutaraldehyde. Therefore, this research provides a novel strategy for preparation of cellulose composite aerogels with excellent acoustic and thermal insulation, and reinforced mechanical property by using the waste bio-based micron down feather fibers.
研究领域:
材料科学
·
生物基材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）