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- W62668076 abstract "Polyurethane foams having densities as low as 120 kg/m 3 are currently being used as thermal insulators. The closed-cell foam structure encompassing the air molecules prevents the thermal conductivity and enhances the efficiency of the used foams as thermal insulators to be used in appliances, construction and automobiles. However, the efficiency of these foams as thermal insulators depends to a great deal on the permeability of various gas molecules through the urethane polymer. In hot-weathered countries, the daily temperatures may reach above 50 o C in the summer and thus enhancing the diffusion of the gas molecules of high kinetic energy through the polymer. In order to increase the efficiency of these insulators, the design of new urethane polymers with low affinity for diffusing gas molecules such as oxygen, nitrogen and carbon dioxide is necessary. Through maximizing the hydrogen bonding network between the hard blocks and the soft segments in the interface region of the polymeric material, new designs of molecularly organized polyurethanes were achieved in this study and evaluated in terms of their capacity to hinder the permeation of the various gas molecules through the polymer. Key-Words: Polyurea-urethane foams, molecular dynamics, thermal insulators, diffusion, free volume, Connolly surface" @default.
- W62668076 created "2016-06-24" @default.
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- W62668076 date "2008-12-15" @default.
- W62668076 modified "2023-09-24" @default.
- W62668076 title "Use of computer simulation and molecular modeling techniques for the design of molecularly organized urea-urethane prototypes for thermal insulation" @default.
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