Effect of hybrid hollow microspheres on thermal insulation performance and mechanical properties of silicone rubber composites

2017 ◽  
Vol 135 (11) ◽  
pp. 46025 ◽  
Author(s):  
Xiong-Wei Zhao ◽  
Chong-Guang Zang ◽  
Ya-Lun Sun ◽  
Yu-Long Zhang ◽  
Yu-Quan Wen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Insulation ◽  
Silicone Rubber ◽  
Hollow Microspheres ◽  
Rubber Composites ◽  
Insulation Performance

Fabrication and properties of carbon/carbon-carbon foam composites

2019 ◽  
Vol 89 (21-22) ◽  
pp. 4452-4460
Author(s):  
Bin Wang ◽  
Bugao Xu ◽  
Hejun Li
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Bonding Strength ◽  
Carbon Foam ◽  
Shear Load ◽  
Foam Composite ◽  
Final Failure ◽  
Carbon Foams ◽  
Insulation Performance

This paper was focused on the development of a new composite for high thermal insulation applications with carbon/carbon (C/C) composites, carbon foams and an interlayer of phenolic-based carbon. The microstructure, mechanical properties, fracture mechanism and thermal insulation performance of the composite was investigated. The experiment results showed that the bonding strength of the C/C-carbon foam composite was 4.31 MPa, and that the fracture occurred and propagated near the interface of the carbon foam and the phenolic-based carbon interlayer due to the relatively weak bonding. The shear load-displacement curves were characterized by alternated linear slopes and serrated plateaus before a final failure. he experiment revealed that the thermal conductivity of the C/C-carbon foam composite was 1.55 W·m−1ċK−1 in 800℃, which was 95.8% lower than that of C/C composites, proving that the thermal insulation of the new foam composite was greatly enhanced by the carbon foam with its porous hollow microstructure.

Study on Short Basalt Fiber Reinforced Silicone Rubber Composites

2013 ◽  
Vol 800 ◽  
pp. 383-386 ◽  
Author(s):  
Wei Li Wu ◽  
Jin Yue Cai
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Silicone Rubber ◽  
Basalt Fiber ◽  
Rubber Composites ◽  
Excellent Performance ◽  
Elongation At Break ◽  
Rubber Composite ◽  
Insulating Properties ◽  
Ozone Resistance

Silicone rubber has excellent performance, such as cold resistance, heat resistance, ozone resistance, thermal properties and insulating properties and so on. However, silicone rubber is in the state of semi-liquids and it is very soft, so the mechanical properties of silicone rubber are very poor. In order to improve its availability of silicone rubber, short basalt fiber / silicone rubber composite materials were prepared by using short basalt fiber as reinforcement, and its mechanical properties and compatibility were studied. The best formulation of short basalt fiber / silicone rubber composite materials were determined by testing Shore A hardness, tensile strength and elongation at break, and the morphology structure and compatibility of short basalt fiber / silicone rubber composite materials were discussed by scanning electron microscope and infrared spectrum, prepare excellent performance of silicone rubber composite materials.

Silica-Bacterial Cellulose Composite Aerogel Fibers with Excellent Mechanical Properties from Sodium Silicate Precursor

Gels ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 17
Author(s):  
Qiqi Song ◽  
Changqing Miao ◽  
Huazheng Sai ◽  
Jie Gu ◽  
Meijuan Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bacterial Cellulose ◽  
Thermal Insulation ◽  
Sol Gel ◽  
Silicate Solution ◽  
High Specific Surface Area ◽  
Composite Aerogel ◽  
Composite Gel ◽  
Novel Method ◽  
Insulation Performance

Forming fibers for fabric insulation is difficult using aerogels, which have excellent thermal insulation performance but poor mechanical properties. A previous study proposed a novel method that could effectively improve the mechanical properties of aerogels and make them into fibers for use in fabric insulation. In this study, composite aerogel fibers (CAFs) with excellent mechanical properties and thermal insulation performance were prepared using a streamlined method. The wet bacterial cellulose (BC) matrix without freeze-drying directly was immersed in an inorganic precursor (silicate) solution, followed by initiating in situ sol-gel reaction under the action of acidic catalyst after secondary shaping. Finally, after surface modification and ambient drying of the wet composite gel, CAFs were obtained. The CAFs prepared by the simplified method still had favorable mechanical properties (tensile strength of 4.5 MPa) and excellent thermal insulation properties under extreme conditions (220 °C and −60 °C). In particular, compared with previous work, the presented CAFs preparation process is simpler and more environmentally friendly. In addition, the experimental costs were reduced. Furthermore, the obtained CAFs had high specific surface area (671.3 m²/g), excellent hydrophobicity, and low density (≤0.154 g/cm3). This streamlined method was proposed to prepare aerogel fibers with excellent performance to meet the requirements of wearable applications.

Thermal Stability and Mechanical Properties of Silicone Rubber Composites Filled with Inorganic Fire-proof Fillers and Expandable Materials

Polymer Korea ◽  
2018 ◽  
Vol 42 (3) ◽  
pp. 354-363 ◽  
Author(s):  
Sosan Hwang ◽  
Hyun Jun Ryu ◽  
Youngseon Kim ◽  
Jae Il So ◽  
Sung Hoon Jin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Silicone Rubber ◽  
Rubber Composites

scholarly journals Phenolic Resin Foam Composites Reinforced by Acetylated Poplar Fiber with High Mechanical Properties, Low Pulverization Ratio, and Good Thermal Insulation and Flame Retardant Performance

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 148 ◽  
Author(s):  
Jian Liu ◽  
Liuliu Wang ◽  
Wei Zhang ◽  
Yanming Han
Keyword(s):  
Mechanical Properties ◽  
Flame Retardant ◽  
Thermal Insulation ◽  
Cell Structure ◽  
Value Added ◽  
Chemical Structures ◽  
Phenolic Foam ◽  
Flame Retardant Properties ◽  
Novel Strategy ◽  
Insulation Performance

Phenolic foam composites (PFs) are of substantial interest due to their uniform closed-cell structure, low thermal conductivity, and good thermal insulation performance. However, their disadvantages of a high pulverization rate and poor mechanical properties restrict their application in building exterior insulation. Therefore, the toughening of these composites is necessary. In this paper, poplar fiber was treated with an acetylation reagent, and the acetylated fiber was used to prepare modified phenolic foams (FTPFs); this successfully solved the phenomenon of the destruction of the foam structure due to the agglomeration of poplar fiber in the resin substrate. The foam composites were comprehensively evaluated via the characterization of their chemical structures, surface morphologies, mechanical properties, thermal conductivities, and flame retardant properties. It was found that the compressive strength and compressive modulus of FTPF-5% respectively increased by 28.5% and 37.9% as compared with those of PF. The pulverization ratio was reduced by 32.3%, and the thermal insulation performance and flame retardant performance (LOI) were improved. Compared with other toughening methods for phenolic foam composites, the phenolic foam composites modified with surface-compatibilized poplar fiber offer a novel strategy for the value-added utilization of woody fiber, and improve the toughness and industrial viability of phenolic foam.

Sign in / Sign up

Export Citation Format

Share Document