Journal ArticleDOI
Prediction of the radiation term in the thermal conductivity of crosslinked closed cell polyolefin foams
TLDR
In this article, the thermal conductivity and the cellular structure as well as the matrix polymer morphology of a collection of chemically crosslinked low-density closed cell polyolefin foams, manufactured by a high-pressure nitrogen gas solution process, have been studied.Abstract:
The thermal conductivity and the cellular structure as well as the matrix polymer morphology of a collection of chemically crosslinked low-density closed cell polyolefin foams, manufactured by a high-pressure nitrogen gas solution process, have been studied. With the aid of a useful theoretical model, the relative contribution of each heat-transfer mechanism (conduction through the gas and solid phases and thermal radiation) has been evaluated. The thermal radiation can be calculated by using a theoretical model, which takes into account the dependence of this heat-transfer mechanism with cell size, foam thickness, chemical composition, and matrix polymer morphology. A simple equation, which can be used to predict the thermal conductivity of a given material, is presented.read more
Citations
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Facile preparation of lightweight microcellular polyetherimide/graphene composite foams for electromagnetic interference shielding.
TL;DR: A facile approach to produce lightweight microcellular polyetherimide (PEI)/graphene nanocomposite foams with a density of about 0.3 g/cm3 is reported by a phase separation process.
Journal ArticleDOI
Polymer nanocomposite foams
TL;DR: Polymer nanocomposite foams with nanoparticles are an intriguing class of materials with unique structure and properties The shape, size and surface chemistry of nanoparticles can be tailored to control the foam structure, and therefore, foam properties.
Journal ArticleDOI
Ultra-tough and super thermal-insulation nanocellular PMMA/TPU
Guilong Wang,Guilong Wang,Jinchuan Zhao,Jinchuan Zhao,Lun Howe Mark,Guizhen Wang,Kejing Yu,Kejing Yu,Chongda Wang,Chul B. Park,Guoqun Zhao +10 more
TL;DR: In this paper, a method to prepare nanocellular polymethylmethacrylate (PMMA)/thermoplastic polyurethane (TPU) with tunable structures is presented.
Journal ArticleDOI
Low-density and structure-tunable microcellular PMMA foams with improved thermal-insulation and compressive mechanical properties
Guilong Wang,Guilong Wang,Jinchuan Zhao,Jinchuan Zhao,Guizhen Wang,Lun Howe Mark,Chul B. Park,Guoqun Zhao +7 more
TL;DR: In this article, the authors report the fabrication of poly (methyl methacrylate) (PMMA) foams with widely tunable cellular structures by using CO2 as the blowing agent.
Journal ArticleDOI
Modelling of thermal transport through a nanocellular polymer foam: toward the generation of a new superinsulating material.
Guilong Wang,Guilong Wang,Chongda Wang,Jinchuan Zhao,Jinchuan Zhao,Guizhen Wang,Chul B. Park,Guoqun Zhao +7 more
TL;DR: An accurate mathematical model is reported for the first time to quantitatively estimate thermal transport through the nanocellular polymer foam and demonstrate a quantitative relationship between the cellular structure and the equivalent thermal conductivity and present the optimum cellular structure scope for achieving the superinsulating performance.
References
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Principles of heat flow in porous insulators
TL;DR: In this article, an approximate theory of the thermal conductivity of porous materials is given, and the effect of pore size and shape on the conductivity is discussed, as well as the effects of different pore sizes and shapes.
Journal ArticleDOI
Thermal Conductivity: VIII, A Theory of Thermal Conductivity of Porous Materials
TL;DR: In this article, the effective thermal conductivity of a porous material is due to both conduction and radiation processes, and a theory is presented relating the effective conductivity to the conductivities of the solid material, to the emissivity of the surface of the pores, and to the size, shape, and distribution of the porous material.
Journal ArticleDOI
Thermal Conductivity: IX, Experimental Investigation of Effect of Porosity on Thermal Conductivity
J. Francl,W. D. Kingery +1 more
TL;DR: In this article, the effect of isometric approximately spherical pores and anisometric cylindrical pores on the thermal conductivity of alumina, graphite, and nickel has been investigated.
Journal ArticleDOI
A Basic Study of Heat Transfer Through Foam Insulation
M.A. Schuetz,Leon R. Glicksman +1 more
TL;DR: In this article, the authors developed a better understanding of the mechanisms controlling heat transfer through foams, which will aid future foam developments and form the basis of a fundamental model for the R value of foam.
Journal ArticleDOI
Thermal transport in polystyrene and polyurethane foam insulations
TL;DR: In this paper, the thermal transport in polystyrene (PS) and polyurethane (PU) foam insulations is described, with special emphasis on the radiative transfer, and the total thermal conductivity of PU foams, including condensation effects of the blowing agent R 11, is modeled.