Outgassing characteristics of a polycarbonate core material for vacuum insulation panels

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Performance deterioration with time is one of the most important issues in a vacuum insulation panel (VIP), which is mostly due to the inner gas pressure rise. Outgassing from the interior of core materials is the major gas source when the core material is a polymer. Outgassing characteristics of a polycarbonate as the VIP's core material are examined theoretically and experimentally. To measure the outgassing rate, specific outgassing tests are carried out using a pressure rise method. Diffusive outgassing mechanism is discussed based on the Fick's law. As the result, the total amount of dissolved gas and the diffusion coefficients of various gases in the polycarbonate are obtained by using the measured outgassing rate. Temperature dependence of the diffusion coefficient of nitrogen is also examined. It is shown that the outgassing rate of polymer core materials can be significantly reduced to a negligible level by a baking pre-treatment in vacuum and/or by a metal coating on the polymer surface. (C) 2011 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2011-02
Language
English
Article Type
Article
Keywords

REVERSIBLY ADSORBED PHASE; PUMP-DOWN; OXYGEN; COVERAGE

Citation

VACUUM, v.85, no.8, pp.839 - 846

ISSN
0042-207X
URI
http://hdl.handle.net/10203/25110
Appears in Collection
ME-Journal Papers(저널논문)
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