Evaluation of Thermal Properties of Fibre Insulation Materials for Inflatable Mini Cold Storage

2013 ◽  
Vol 803 ◽  
pp. 213-217 ◽  
Author(s):  
Yan Wu ◽  
Jiu Chun Han ◽  
Xi Hong Li ◽  
Zhi Li
Keyword(s):  
Thermal Conductivity ◽  
Cold Storage ◽  
Loss Rate ◽  
Radiation Heat Transfer ◽  
Far Infrared ◽  
Decomposition Temperature ◽  
Initial Decomposition Temperature ◽  
Insulation Materials ◽  
Fibrous Insulation ◽  
Heat Preservation

Fibre materials, as thermal insulation materials, will be an optimum choice for inflatable mini cold storage. The evaluation index such as infrared spectrum, thermal stability and thermal conductivity is closely related to the selection and application of fibrous insulation materials. The results showed that the transmittance of bamboo fibre tested by Fourier Transform Infrared Spectroscopy (FTIR) measurements was about 35.3% with an advantage to the heat preservation, and radiation heat transfer was analyzed in the area of far-infrared. The initial decomposition temperature of 1#, 2# and 3# measured by TGA curve was respectively 383.9°C, 372.5°Cand 315.4°C, and the total thermal weight loss rate of 1#, 2# and 3# was 64.59%, 90.16% and 80.47%. The thermal conductivity of 1# at 0°C was 0.035 W·m-1·K-1, lower than 2# and 3#, also lower in the temperature range from 0°C to 8°C, measured by hypothermia thermal instrument.

scholarly journals Synergistic Effects of Functional CNTs and h-BN on Enhanced Thermal Conductivity of Epoxy/Cyanate Matrix Composites

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 997 ◽  
Author(s):  
Mingzhen Xu ◽  
Yangxue Lei ◽  
Dengxun Ren ◽  
Sijing Chen ◽  
Lin Chen ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Conductivity Coefficient ◽  
Hexagonal Boron Nitride ◽  
Synergistic Effects ◽  
Decomposition Temperature ◽  
Resin Matrix ◽  
Matrix Composites ◽  
Initial Decomposition Temperature ◽  
Microelectronic Devices ◽  
Enhanced Thermal Conductivity

Epoxy/cyanate resin matrix composites (AG80/CE) with improved thermal conductivity and mechanical properties were obtained with synergetic enhancement with functional carbon nanotubes (f-CNTs) and hexagonal boron nitride (h-BN). AG80/CE performed as polymeric matrix and h-BN as conductivity filler which formed the main thermal conductivity channels. Small amounts of f-CNTs were introduced to repair defects in conductivity channels and networks. To confirm the synergetic enhancements, the thermal conductivity was investigated and analyzed with Agari’s model. Results indicated that with introduction of 0.5 wt% f-CNTs, the thermal conductivity coefficient (ƛ) increased to 0.745 W/mk, which is 1.38 times that of composites with just h-BN. Furthermore, the flexural strength and modulus of composites with 0.5 wt% f-CNTs were 85 MPa and 3.5 GPa. The glass transition temperature (Tg) of composites with 0.4 wt% was 285 °C and the initial decomposition temperature (T5%) was 385 °C, indicating outstanding thermal stability. The obtained h-BN/f-CNTs reinforced AG80/CE composites present great potential for packaging continuous integration and miniaturization of microelectronic devices.

scholarly journals Thermo-Insulation Properties Of Hemp-Based Products

2015 ◽  
Vol 52 (1) ◽  
pp. 38-51 ◽  
Author(s):  
V. Lekavicius ◽  
P. Shipkovs ◽  
S. Ivanovs ◽  
A. Rucins
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
New Products ◽  
Environmental Safety ◽  
Insulation Materials ◽  
Fibrous Insulation

Abstract As known, many multi-purpose plants can be used in different industries. This research is focused on the possibilities to utilize hemp as feedstock for thermal insulation products. The most advantageous features of hemp insulation are associated with health and environmental safety. The thermal conductivity of commercially available hemp insulation products is comparable with that of other fibrous insulation materials; however, it is possible to develop new products that could be more efficient in terms of cost and due to other important features.

scholarly journals Effects of Zirconium Silicide on the Vulcanization, Mechanical and Ablation Resistance Properties of Ceramifiable Silicone Rubber Composites

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 496 ◽  
Author(s):  
Jiuqiang Song ◽  
Zhixiong Huang ◽  
Yan Qin ◽  
Honghua Wang ◽  
Minxian Shi
Keyword(s):  
Thermal Conductivity ◽  
Silicone Rubber ◽  
Thermal Protection ◽  
Permanent Deformation ◽  
Ablation Rate ◽  
Decomposition Temperature ◽  
Rubber Composites ◽  
Initial Decomposition Temperature ◽  
Ablation Resistance ◽  
Zirconium Silicide

Ceramifiable silicone rubber composites play important roles in the field of thermal protection systems (TPS) for rocket motor cases due to their advantages. Ceramifiable silicone rubber composites filled with different contents of ZrSi2 were prepared in this paper. The fffects of ZrSi2 on the vulcanization, mechanical and ablation resistance properties of the composites were also investigated. The results showed that the introduction of ZrSi2 decreased the vulcanization time of silicone rubber. FTIR spectra showed that ZrSi2 did not participate in reactions of the functional groups of silicone rubber. With the increasing content of ZrSi2, the tensile strength increased first and then decreased. The elongation at break decreased and the permanent deformation increased gradually. The thermal conductivity of the composite increased from 0.553 W/(m·K) to 0.694 W/(m·K) as the content of the ZrSi2 increased from 0 to 40 phr. In addition, the thermal conductivity of the composite decreased with the increase of temperature. Moreover, thermal analysis showed that the addition of ZrSi2 increased the initial decomposition temperature of the composite, but had little effect on the peak decomposition temperature in nitrogen. However, the thermal decomposition temperature of the composite in air was lower than that in nitrogen. The addition of ZrSi2 decreased the linear and mass ablation rate, which improved the ablative resistance of the composite. With the ZrSi2 content of 30 phr, the linear and mass ablation rate were 0.041 mm/s and 0.029 g/s, decreasing by 57.5% and 46.3% compared with the composite without ZrSi2, respectively. Consequently, the ceramifiable silicone rubber composite filled with ZrSi2 is very promising for TPS.

Microstructural Characteristics of Punica granatum Fruit at Dynamic Temperature inside the Fibre Insulation Materials

2014 ◽  
Vol 518 ◽  
pp. 8-11
Author(s):  
Xi Hong Li ◽  
Li Li ◽  
Xia Liu ◽  
Wei Wang ◽  
Jiu Chun Han
Keyword(s):  
Cell Walls ◽  
Polyester Fibre ◽  
Radiation Heat Transfer ◽  
Far Infrared ◽  
Punica Granatum ◽  
Radiation Heat ◽  
Microstructural Characteristics ◽  
Dynamic Temperature ◽  
Insulation Materials ◽  
Higher Temperature

Differentiation in microstructural characteristics ofPunica granatumfruit in response to different dynamic temperatures (2 oC, 4 oC, 6 oC, and 8 oC) during cold storage inside the fibre insulation materials was investigated. The results from Fourier Transform Infrared Spectroscopy (FTIR) measurements showed that the polyester fibre exhibited an advantage and the radiation heat transfer was analyzed in the area of far-infrared. By evidence, the examination by scanning electron microscope (SEM) revealed that effect of dynamic temperature onPunica granatumfruits was structurally different. The fruits stored at higher temperature (6 oC and 8 oC) were associated with fractured cell walls and collapse of cells.

scholarly journals Effect of Acetylation Modification on Structure and Properties of Windmill Palm Fiber

2021 ◽  
Author(s):  
Changjie Chen ◽  
jing Tan ◽  
Weiguo Zhang ◽  
Zhong Wang ◽  
Guohe Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Stability ◽  
Sound Absorption ◽  
Water Repellency ◽  
Decomposition Temperature ◽  
Initial Decomposition Temperature ◽  
Palm Fiber ◽  
Static Contact ◽  
Micro Holes ◽  
Micro Morphology

Abstract Windmill palm fiber, a high-quality cellulose resource, can be extracted from discarded palm sheath. However, its application in textile filling and composite reinforcement is limited due to its hydrophilic solid. In this paper, effects of chemical treatment such as alkali, acetyl chloride, and acetic anhydride treatment on the micro-morphology, water repellency, sound absorption, thermal conductivity and thermal stability of the windmill palm fiber were investigated. The results showed that the surface of windmill palm fiber treated by alkali was relatively smooth and compact. In comparison, the acetylation treatment destroyed the cell wall with micro-holes on the surface. Acetylation modification can significantly improve the water repellency of fibers. Furthermore, thewater static contact angle can be achieved 148o. Acetylation treatment improved the sound absorption performance of the fiber mat with an average sound absorption coefficient of 0.47, kept low thermal conductivity of under 0.050 W/(m℃), and improved the thermal stability with the initial decomposition temperature 356oC.

Thermal and Combustion Characteristics of Binderless Fiberboard

2010 ◽  
Vol 113-116 ◽  
pp. 1063-1070 ◽  
Author(s):  
Chun De Jin ◽  
Jian Li ◽  
Rui Xian Zheng
Keyword(s):  
Heat Release ◽  
Loss Rate ◽  
Decomposition Temperature ◽  
Combustion Characteristics ◽  
Inorganic Acid ◽  
Total Heat Release ◽  
Weight Loss Rate ◽  
Initial Decomposition Temperature ◽  
Flaming Combustion ◽  
Grinding System

Thermagravimetric and combustion characteristics of binderless fiberboard (BF) were investigated. Fibers prepared by traditional heat grinding (FB) and which prepared in the presence of trivial inorganic acid during grinding (FBA) were used as compared. The results show that the total weight lost during thermal decomposition following as: BF > FBA > FB. The order of initial decomposition temperature was that FB > BF > FBA. Thermagravimetric weight loss rate in pyrolysis of woodfiber and binderless fiberboard got from adding minim inorganic acid in the heat grinding system to heat grinding were faster compared to the woodfiber made by heat grinding. Combustion characteristics results revealed that heat release rate and total heat release amount of BF were larger than that of FB. Smoking ratio of BF was larger than that of FB before the flaming combustion, but t less than that of FB after the flaming combustion. The concentration of produced CO2 and CO for BF during combustion was higher than FB.

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