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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/100572


    Title: Absorption and foaming of plastics using carbon dioxide
    Authors: Lin, Gwo-Geng;Lin, Dar-Jong;Wang, Li-Jung;Kuo, Ting-Wei
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: Foamed plastics;Henry constant;Diffusion coefficient;Carbon dioxide;Absorption
    Date: 2014-07-01
    Issue Date: 2015-03-06 10:37:31 (UTC+8)
    Publisher: Dordrecht: Springer Netherlands
    Abstract: In this study, carbon dioxide was used as a foaming agent for common
    plastics, such as acrylonitrile–butadiene–styrene (ABS) polymer, polystyrene (PS),
    polypropylene (PP), high-density polyethylene (HDPE), and high impact polystyrene
    (HIPS). Carbon dioxide was first absorbed by the sample plastics placed within
    a pressure vessel at various pressure levels and absorption time intervals. The
    Henry’s constant of the absorbed carbon dioxide in the plastics was determined. The
    diffusion coefficient of carbon dioxide in polymer was also identified by curve-
    fitting with the relationship between the absorbed amount and time. The results
    showed that ABS, PS, and HIPS absorbed more gas than did PP and HDPE, because
    PP and HDPE exhibit higher crystallinity. Generally, a polymer can take up saturation
    absorption of gas under higher pressure. After absorption, the foaming process
    occurred at various temperatures and time intervals. The cell structure, density,
    and size of the plastic foams were then investigated using scanning electron
    microscopy. A longer foaming period and higher temperature increase the size of
    the cell and decrease the cell density (the number of bubbles per unit volume). A
    dense skin layer without bubbles appeared directly adjacent to the surface of the
    foamed plastics. Its thickness decreased if the foaming process took place at higher
    temperatures.
    Relation: Research on Chemical Intermediates 40(6), pp.2259-2269
    DOI: 10.1007/s11164-014-1603-z
    Appears in Collections:[化學工程與材料工程學系暨研究所] 期刊論文

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