Thermal conductivity of reinforced plastic foams

1991 ◽  
Vol 26 (4) ◽  
pp. 452-454
Author(s):  
M. P. Gailite ◽  
A. M. Tolks ◽  
A. Zh. Lagzdin' ◽  
A. E. Terauds
Keyword(s):  
Thermal Conductivity ◽  
Plastic Foams ◽  
Reinforced Plastic

Natural Fiber Reinforced Plastic Foams from Plant Oil-Based Resins

2008 ◽  
Vol 47-50 ◽  
pp. 149-152 ◽  
Author(s):  
Min Zhi Rong ◽  
Su Ping Wu ◽  
Ming Qiu Zhang
Keyword(s):  
Natural Fiber ◽  
Sisal Fiber ◽  
Fiber Reinforced ◽  
Plant Oil ◽  
Soil Burial ◽  
Plastic Foams ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Compressive Performance ◽  
Sisal Fibers

In this work, a simple but effective approach was reported for preparing natural fiber reinforced plastic foams based on plant oil with excellent compressive performance and biodegradability. Firstly, epoxidized soybean oil (ESO) was converted into its acrylate ester AESO, which can be free-radically copolymerized with reactive diluents like styrene to give thermosetting resins and their foam plastics. Then the bio-foam composites were produced using short sisal fiber as the reinforcement. Effects of fiber loading, length and surface treatment on properties of the foam composites were investigated. It was found that exposure of the fibers to gas cells of the foam reduced the effectiveness of interfacial effect, which is different from conventional bulk composites. As a result, reinforcing ability of sisal fibers became a function of fiber length, loading, etc. Furthermore, the plastic foams based on plant oil resin were proved to be biodegradable in soil burial or in the presence of fungi.

Numerical analysis of effective thermal conductivity of plastic foams

2016 ◽  
Vol 51 (20) ◽  
pp. 9217-9228 ◽  
Author(s):  
André Chateau Akué Asséko ◽  
Benoît Cosson ◽  
Clément Duborper ◽  
Marie-France Lacrampe ◽  
Patricia Krawczak
Keyword(s):  
Thermal Conductivity ◽  
Numerical Analysis ◽  
Effective Thermal Conductivity ◽  
Plastic Foams

scholarly journals Thermal Conductivity of High-Strength Polyethylene Fiber and Applications for Cryogenic Use

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Atsuhiko Yamanaka ◽  
Tomoaki Takao
Keyword(s):  
Thermal Conductivity ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
High Strength ◽  
Fiber Direction ◽  
Fiber Reinforced ◽  
Cross Sectional ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Polyethylene Fiber

The local temperature rise of the tape is one of instabilities of the conduction-cooled high temperature superconducting (HTS) coils. To prevent the HTS tape from locally raising a temperature, high thermal conductive fiber reinforced plastic was applied to coil bobbin or spacer for heat drain from HTS tape. The thermal conductivity of ramie fibers increases by increasing orientation of molecular chains with drawing in water, and decreases by chain scission with γ-rays irradiation or by bridge points in molecular chains with vapor-phase-formaldehyde treatments. Thermal conductivity of high strength ultra-high-molecular-weight (UHMW) polyethylene (PE) fiber increases lineally in proportion to tensile modulus and decreases by molecular chain scissions with γ-rays irradiation. This result suggested the contribution of the long extended molecular chains due to high molecular weight on the high thermal conductivity of high strength UHMW PE fiber. Thermal conductivity of high strength UHMW PE fiber reinforced plastics in parallel to fiber direction is proportional to the cross sectional ratio of reinforcement oriented in the conduction direction. Heat drain effect of high strength UHMW PE fiber reinforced plastic from HTS tape is higher than that of glass fiber reinforced plastic (GFRP) and lower than that of aluminum nitride (AlN). In the case of HTS coil, the thermal stability wound on coil bobbin made of high strength UHMW PE fiber reinforced plastic is good as that of AlN, and better than that of GFRP.

Thermal conductivity of plastic foams

1983 ◽  
Vol 23 (6) ◽  
pp. 293-298 ◽  
Author(s):  
R. J. J. Williams ◽  
C. M. Aldao
Keyword(s):  
Thermal Conductivity ◽  
Plastic Foams

scholarly journals Effects of the Heat Treatment in the Properties of Fibrous Aerogel Thermal Insulation

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 2001 ◽  
Author(s):  
Ákos Lakatos ◽  
Attila Csík ◽  
Anton Trník ◽  
István Budai
Keyword(s):  
Thermal Conductivity ◽  
Heat Treatment ◽  
Thermal Annealing ◽  
Thermal Insulation ◽  
Structural Changes ◽  
Glass Fibers ◽  
Material Structure ◽  
Scanning Calorimetry ◽  
Plastic Foams ◽  
Isothermal Heat Treatments

Nowadays, besides the use of conventional insulations (plastic foams and wool materials), aerogels are one of the most promising thermal insulation materials. As one of the lightest solid materials available today, aerogels are manufactured through the combination of a polymer with a solvent, forming a gel. For buildings, the fiber-reinforced types are mainly used. In this paper, the changes both in the thermal performance and the material structure of the aerogel blanket are followed after thermal annealing. The samples are put under isothermal heat treatments at 70 °C for weeks, as well as at higher temperatures (up to 210 °C) for one day. The changes in the sorption properties that result from the annealing are presented. Furthermore, the changes in the thermal conductivity are followed by a Holometrix Lambda heat flow meter. The changes in the structure and surface of the material due to the heat treatment are investigated by X-ray diffraction and with scanning electron microscopy. Besides, the above-mentioned measurement results of differential scanning calorimetry experiments are also presented. As a result of using equipment from different laboratories that support each other, we found that the samples go through structural changes after undergoing thermal annealing. We manifested that the aerogel granules separate down from the glass fibers and grow up. This phenomenon might be responsible for the change in the thermal conductivity of the samples.

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