Résumé :
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The dissertation concerns the super thermal insulation materials, the rigid closed-cell cellular plastics (CPs) which are traditionally blown by the chlorofluorocarbons (CFCs). Whenever a CP has been produced, the blown agents or cell gases with low thermal conductivity are diffusing out off the foam whilst the air components with relatively high thermal conductivity are diffusing into it. As a result, the overall thermal conductivity of the foam increases ; or aging occurs. Therefore, to support the production of CFC-free CPs, to predict the long-term aging and to develop the quality control methodology for CPs then became the objectives of this study. 2-D and 3-D long-term aging models, a gaseous transfer property measurement apparatus and experimental quality control methods have been established.
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