VOC EMISSION MECHANISMS FROM BUILDING MATERIALS BY CONSIDERING INTERNAL BEHAVIOR

摘要

Airborne molecular contaminants in indoor or cleanroom air have been recognized as thernimportant problems of human health or semiconductor processes. It was reported that the emission fluxrnof volatile organic compounds (VOC) was controlled by the evaporation from building material surfacesrnand the internal diffusion within the building materials, therefore the internal behavior is the importantrnfactor for understanding the emission mechanisms. In this study, the VOC emission from the surface andrnthe concentration of VOC within the building material were evaluated by using the small environmentalrnchamber methods under different temperatures and using the screening test method, respectively. Thenrnthe model with the factor of VOC diffusion in the materials and the mass transfer from the materialrnsurfaces was used for estimating the emission flux from the experimental internal concentration datarnwithin the material. As a result, the emission flux that could be extrapolated by the model agreed withrnthe chamber test data, therefore it was clarified that the internal concentration within the material had arngreat effect on the emission flux.