An ultralow-temperature superelastic polymer aerogel with high strength as a great thermal insulator under extreme conditions

2020 ◽  
Vol 8 (36) ◽  
pp. 18698-18706
Author(s):  
Ting Wang ◽  
Man-Cheng Long ◽  
Hai-Bo Zhao ◽  
Bo-Wen Liu ◽  
Hai-Gang Shi ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Flame Retardancy ◽  
High Strength ◽  
Extreme Conditions ◽  
Thermal Insulator ◽  
Ultralow Temperature ◽  
Polymer Aerogel ◽  
And Performance ◽  
Harsh Conditions

Taking advantage of structural elastic strategy to create polymer aerogels with ultralow-temperature superelasticity. The aerogels also display low thermal conductivity, excellent thermal insulation under harsh conditions, flame retardancy, and performance stability.

scholarly journals Fique as a Sustainable Material and Thermal Insulation for Buildings: Study of Its Decomposition and Thermal Conductivity

2021 ◽  
Vol 13 (13) ◽  
pp. 7484
Author(s):  
Gabriel Fernando García Sánchez ◽  
Rolando Enrique Guzmán López ◽  
Roberto Alonso Gonzalez-Lezcano
Keyword(s):  
Thermal Conductivity ◽  
Thermal Decomposition ◽  
Thermal Insulation ◽  
Model Fitting ◽  
Good Alternative ◽  
Negative Effects ◽  
Thermal Insulator ◽  
Fitting Method ◽  
Thermogravimetric Data ◽  
Reduce Energy Consumption

Buildings consume a large amount of energy during all stages of their life cycle. One of the most efficient ways to reduce their consumption is to use thermal insulation materials; however, these generally have negative effects on the environment and human health. Bio-insulations are presented as a good alternative solution to this problem, thus motivating the study of the properties of natural or recycled materials that could reduce energy consumption in buildings. Fique is a very important crop in Colombia. In order to contribute to our knowledge of the properties of its fibers as a thermal insulator, the measurement of its thermal conductivity is reported herein, employing equipment designed according to the ASTM C 177 standard and a kinetic study of its thermal decomposition from thermogravimetric data through the Coats–Redfern model-fitting method.

Study and Application of Plastic Construction Materials

2011 ◽  
Vol 99-100 ◽  
pp. 1117-1120 ◽  
Author(s):  
Mao Quan Xue
Keyword(s):  
Thermal Conductivity ◽  
Corrosion Resistance ◽  
Energy Saving ◽  
Thermal Insulation ◽  
Flame Retardancy ◽  
Building Materials ◽  
Construction Materials ◽  
Low Thermal Conductivity ◽  
Building Walls

As new building materials, plastic has light weigh, corrosion resistance, low thermal conductivity, thermal insulation, waterproof, energy-saving, molding convenient, high recycling characteristic, widely used in building materials. According to the research of improving its flame retardancy, strength, thermal insulation, waterproof properties, the application of plastic use in doors and windows, pipeline, building walls and roofs of buildings, etc. were reviewed, and the developing direction was discussed.

Loose Fill Material from Hemp Shives and Binding Material for Thermal Insulation and Structural Use

2017 ◽  
Vol 908 ◽  
pp. 134-138
Author(s):  
Sigitas Vėjelis ◽  
Lina Lekūnaitė-Lukošiūnė ◽  
Jurga Šeputytė-Jucikė
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
New Technologies ◽  
High Strength ◽  
Liquid Sodium ◽  
Building Performance ◽  
Binding Material ◽  
Fill Material ◽  
Innovative Materials ◽  
Loose Fill

Currently building sector requires the use of new technologies and innovative materials. Realization of mentioned requirements allow ensuring rate of performed works, reducing labour building constructions costs and improving building performance. In current work, loose fill material from hemp shives and binding material are analysed. The mixture of hemp shives and binder may be used in frame constructions as blown or poured loose fill material for thermal insulation or structural use. Hardened composite is characterized by high strength and excellent thermal conductivity when it is used in building partitions and enclosures. In our work hemp shives are mineralized with different amount of liquid sodium silicate and mixed with cementitious binder. Macro-and microstructures of hardened composite are analysed, influence of amount of mineralizer on the strength and thermal conductivity of composite is evaluated.

scholarly journals Preparation and Characterization of Furan–Matrix Composites Blended with Modified Hollow Glass Microsphere

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1480
Author(s):  
Yizhe Ma ◽  
Ying Du ◽  
Jin Zhao ◽  
Xubo Yuan ◽  
Xin Hou
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Flame Retardancy ◽  
Particle Dispersion ◽  
Glass Microsphere ◽  
Resin Matrix ◽  
Hollow Glass Microsphere ◽  
Limiting Oxygen Index ◽  
Hollow Glass ◽  
Furan Resin

In this study, a new class of thermal insulation composites was prepared by blending a modified hollow glass microsphere (HGM) with furan resin. The particle dispersion between the microparticles and resin matrix was improved using 3-methacryloxypropyltrimethoxy silane (KH-570). Furthermore, the structure and morphology of the modified HGM were characterised by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). In addition, the effects of the modified HGM on the thermal insulation, flame retardancy, and thermal properties of the composites were investigated. The thermal conductivity of the composites was lower than that of the native furan resin. The minimum thermal conductivity of the composites was 0.0274 W/m·K; the flame retardancy of the composites improved, and the limiting oxygen index become a maximum of 31.6%, reaching the refractory material level. Furthermore, the thermal analysis of the composites demonstrated enhanced thermal stability. This study demonstrates that the composite material exhibited good thermal insulation performance and flame retardancy and that it can be applied in the field of thermal insulation.

scholarly journals Anisotropic and hierarchical SiC@SiO2 nanowire aerogel with exceptional stiffness and stability for thermal superinsulation

2020 ◽  
Vol 6 (26) ◽  
pp. eaay6689 ◽  
Author(s):  
Lei Su ◽  
Hongjie Wang ◽  
Min Niu ◽  
Sheng Dai ◽  
Zhixin Cai ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heat Treatment ◽  
High Temperatures ◽  
Thermal Insulation ◽  
Extreme Conditions ◽  
Aerospace Vehicles ◽  
Hierarchical Microstructure ◽  
High Efficient ◽  
Low Stiffness ◽  
Insulation Performance

Ceramic aerogels are promising lightweight and high-efficient thermal insulators for applications in buildings, industry, and aerospace vehicles but are usually limited by their brittleness and structural collapse at high temperatures. In recent years, fabricating nanostructure-based ultralight materials has been proved to be an effective way to realize the resilience of ceramic aerogels. However, the randomly distributed macroscale pores in these architectures usually lead to low stiffness and reduced thermal insulation performance. Here, to overcome these obstacles, a SiC@SiO2 nanowire aerogel with a nanowire-assembled anisotropic and hierarchical microstructure was prepared by using directional freeze casting and subsequent heat treatment. The aerogel exhibits an ultralow thermal conductivity of ~14 mW/m·K, an exceptional high stiffness (a specific modulus of ~24.7 kN·m/kg), and excellent thermal and chemical stabilities even under heating at 1200°C by a butane blow torch, which makes it an ideal thermally superinsulating material for applications under extreme conditions.

scholarly journals Utilization of Water Hyacinth (Eichhornia crassipes) and Corncob (Zea mays) in Epoxy-based Biocomposite Board for Cool Box Thermal Insulation Material

2021 ◽  
Vol 891 (1) ◽  
pp. 012001
Author(s):  
N M K S Sruti ◽  
P R Jenaneswari ◽  
M R Rahayu ◽  
FA Syamani
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Water Hyacinth ◽  
Eichhornia Crassipes ◽  
Bending Strength ◽  
Insulation Material ◽  
Thermal Insulation Material ◽  
Thermal Insulator ◽  
Useful Life ◽  
Effectiveness Assessment

Abstract Generally, the cool box is produced using styrofoam as the main thermal insulation material. However, the use of styrofoam potentially cause pollution to the environment at the end of its useful life because it cannot decompose naturally. The effort to overcome this problem is by producing thermal insulation materials from natural sources such as water hyacinth and corncob. The purpose of this study was to determine the characteristics of biocomposite board made from combination of water hyacinth powder and corncob ash based on physical, mechanical, and thermal conductivity analysis. Biocomposite boards were produced by introducing combination of water hyacinth powder and corncorb ash (5, 10, 15%wt) into epoxy resin. The ratio of water hyacinth powder and corncob ash were 100:0 (P0), 95:5 (P1), 90:10 (P2), 85:15 (P3). The biocomposite boards were also made from water hyacinth powder and corncob powder, which ratio of 15:85 (P4) and 0:100 (P5). The results of this research revealed that type P5 board had the lowest density value (0.927 g / cm3) and the lowest water absorption value (1.53%). The P2 type board shows the highest bending strength (8.6 N/mm2) which met the requirements of JIS A 5908 for particleboards type 8. The highest value of compressive strength was observed at P5 type board which was 2.94 ± 0.53 N / mm2. The lowest thermal conductivity values were observed at P2 type boards (0.305 W / mK). It can be concluded that, P2 type board had the best thermal insulator properties among other boards in this study. The thermal insulation effectiveness assessment of biocomposite board for cool box application was conducted using P2 and P5 type boards. The assessment results demonstrated that the styrofoam cool box and commercial cool box performance for maintaining temperature were superior compared to biocomposite cool box. Therefore, it is necessary to re-examine the biocomposite cool box, especially in terms of panel assembling and the shape of the lid, to produce biocomposite cool box with thermal insulator properties comparable to the commercial cool box.

Preparation and Performance of Inorganic Thermal Insulation Glazed Hollow Bead Material

2016 ◽  
Vol 680 ◽  
pp. 306-310
Author(s):  
Lei Yu ◽  
Cheng Zhang ◽  
Zhen Gan Wu
Keyword(s):  
Thermal Conductivity ◽  
Surface Morphology ◽  
Thermal Insulation ◽  
Compression Strength ◽  
Lightweight Aggregate ◽  
Optimal Level ◽  
The Other ◽  
High Concern ◽  
Building Wall ◽  
And Performance

Glazed hollow bead, a kind of inorganic lightweight aggregate that has been recently developed, has raised high concern in the field of thermal insulation of building wall due to its low thermal conductivity, low water absorption, good fireproof performance and relatively high compression strength. In this paper, the preparation of this thermal insulation glazed hollow bead material was introduced in detail, the influence of the amount of gel material on bulk density, porosity, thermal conductivity, compression strength of the thermal insulation glazed hollow bead material was investigated, the surface morphology and surface components were characterized by means of SEM and EDS. Results showed that the density, thermal conductivity and compression strength increased while the porosity decreased with the amount of gel material increasing. Appropriate temperature enables gel material to work at optimal level under which the compression strength increases, on the other hand, the porosity also increases, therefore, the thermal conductivity decreases.

scholarly journals Biobased foams for thermal insulation: material selection, processing, modelling, and performance

RSC Advances ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 4375-4394
Author(s):  
Rebecca Mort ◽  
Keith Vorst ◽  
Greg Curtzwiler ◽  
Shan Jiang
Keyword(s):  
Thermal Conductivity ◽  
Physical Properties ◽  
Thermal Insulation ◽  
Material Selection ◽  
Insulation Material ◽  
Materials Selection ◽  
Thermal Insulation Material ◽  
Low Thermal Conductivity ◽  
And Performance

This review outlines the progress in biobased foams with a focus on low thermal conductivity. It introduces materials selection and processing, compares performance, examines modelling of physical properties, and discusses challenges in applying models to real systems.

CMW 100

Alloy Digest ◽  
2000 ◽  
Vol 49 (10) ◽  
Keyword(s):  
Thermal Conductivity ◽  
Heat Treatment ◽  
Copper Alloy ◽  
High Strength ◽  
Heat Treating ◽  
Age Hardening ◽  
High Tensile Strength ◽  
Electrical Components ◽  
Flash Welding ◽  
Hardening Heat Treatment

Abstract CMW 100 is a copper alloy that combines high tensile strength with high electrical and thermal conductivity. It responds to age-hardening heat treatment. It is used for flash welding dies, springs, electrical components, high-strength backing material for brazed assemblies, and wire guides. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: CU-29. Producer or source: CMW Inc. Originally published as Mallory 100, August 1955, revised October 2000.

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