English  |  正體中文  |  简体中文  |  Items with full text/Total items : 52047/87178 (60%)
Visitors : 8704643      Online Users : 129
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/60187

    Title: The DSC study on physical aging of PET
    Authors: Don, Trong-ming
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: physical aging;relaxation;PET;DSC;glass transition temperature;fractional exponential function
    Date: 1990-11
    Issue Date: 2011-10-13 13:25:43 (UTC+8)
    Publisher: 臺北縣泰山鄉:明志工業專科學校
    Abstract: Isothermal enthalpy relaxation in polyethylene terephthalate (PET) was measured at different annealing temperature below the glass transition temperature (Tg) on a differentia l scanning calorimeter (DSC) . The endothermic peaks below Tg were found on DSC scan curves and the peaks increased in magnitude and shifted to higher temperature with increasing aging time. We found the empirical fractional exponential function could describe the aging phenomena. The time constant r e in the fractional exponential function was lower at higher aging temperature It meant the aging rate was increasing with aging temperature. The temperature dependent activation energy obtained from this method was about 40 Kcal / mole. Also from the fractional exponential function fitting ,we found that the relaxation curves of samples aging at different temperatures couldn't be superimposed by a shift in time.
    Relation: 79年技術與教學研討會論文集,[3]-35-42
    Appears in Collections:[化學工程與材料工程學系暨研究所] 會議論文

    Files in This Item:

    File Description SizeFormat
    The DSC study on physical aging of PET.pdf摘要416KbAdobe PDF260View/Open

    All items in 機構典藏 are protected by copyright, with all rights reserved.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback