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Long-Term Thermal Conductivity Prediction of Polyurethane Foam Applying Precision Mass Spectrometer for Cell Gas Analysis  

Kim, Jin-Seok (Division of Quality Life, Korea Research of Standard and Science)
Chun, Jong-Han (Division of Applied Chemistry and Biotechnology, Hanbat National University)
Lee, Jin-Bok (Division of Quality Life, Korea Research of Standard and Science)
Lee, Hyo-Jin (Department of Buiding Service Engineering, Hanbat National University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.22, no.10, 2010 , pp. 679-686 More about this Journal
Abstract
A proprietary device is adopted to break out the membrane of cell in the rigid polyurethane foam. As it is known, the membrane of cell is hardly tearing-off thoroughly in a mechanical way due to both its elastic characteristic and micro sized pores. In this study, a novel experimental approach is introduced to burst out all gases inside the cells of the rigid polyurethane foam by abrasively grinding micro-cells completely into fine powder. The biggest advantage of this approach is to be capable of releasing all gases out from the cell even in the micro pores. As clearly reflected from the repeatability, the accuracy of the result is highly improved and high confidence in the data sets as well. For the measurements of not only gas composition but partial pressure for each gas simultaneously as well, a precision gas mass spectrometer is used in-line directly to the abrasive grinding device. To control the starting point of the polyurethane foam, all samples were prepared on site in the laboratory. Manufactured time is one of the most critical factors in characterization of cell gas composition because it is known that one of gas composition, especially, carbon dioxide, is diffused out dramatically in a short period of time as soon as it is foamed.
Keywords
Polyurethane foam; Aging; Thermal conductivity;
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