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  • 1
    Electronic Resource
    Electronic Resource
    Temperature-Modulated Differential Scanning Calorimetry IX. Some comments on the rigid amorphous fraction in semi-crystalline poly(ethylene terephthalate) (1998)
    Springer
    Journal of thermal analysis and calorimetry 54 (1998), S. 651-657 
    Details
    ISSN: 1572-8943
    Keywords: crystallinity ; heat capacity ; PET ; TMDSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The increment of heat capacity at the glass transition for semi-crystalline poly(ethylene terephthalate) (PET) observed by temperature-modulated differential scanning calorimetry (TMDSC) shows significant deviations from a simple crystalline/amorphous two-phase model. Introduction of a rigid amorphous fraction, which is non-crystalline but which also does not participate in the normal glass transition, allows a much better description of the transition behaviour in semi-crystalline PET. Certain questions arise such as what is the rigid amorphous fraction and over what temperature range do these rigid amorphous segments devitrify? These TMDSC results show that the rigid amorphous component may be treated as an interphase between amorphous and crystalline phases. This interphase does not exhibit a separate glass transition temperature at temperatures above the normal Tg. The suggestion is made that the glass transition of the rigid amorphous component occurs continually between the glass transition temperature of the amorphous phase and up to about 135°C for this particular sample of PET.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010163113898
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Modulated differential scanning calorimetry (1997)
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 209-218 
    Details
    ISSN: 1572-8943
    Keywords: glass transition ; heat capacity ; modulated DSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Modulated-temperature differential scanning calorimetry was used to measure the glass transition temperature,T g, the heat capacity relaxation in the glassy state and the increment of heat capacity, δCp, in the glass transition region for several polymers. The differential of heat capacity with respect to temperature was used to analyseT g and δCp simply and accurately. These measurements are not affected by complex thermal histories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01987441
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    Paper (German National Licenses)
    Fulltext
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