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  • 1
    Electronic Resource
    Electronic Resource
    Temperature modulated calorimetry and dielectric spectroscopy in the glass transition region of polymers (1996)
    Springer
    Journal of thermal analysis and calorimetry 46 (1996), S. 935-954 
    Details
    ISSN: 1572-8943
    Keywords: calorimetry ; dielectric ; glass transition ; modulated DSC ; polymers ; relaxation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The results from temperature modulated DSC in the glass transition region of amorphous and semicrystalline polymers are described with the linear response approach. The real and the imaginary part of the complex heat capacity are discussed. The findings are compared with those of dielectric spectroscopy. The frequency dependent glass transition temperature can be fitted with a VFT-equation. The transition frequencies are decreased by 0.5 to 1 orders of magnitude compared to dielectric measurements. Cooling rates from standard DSC are transformed into frequencies. The glass transition temperatures are also approximated by the VFT-fit from the temperature modulated measurements. The differences in the shape of the curves from amorphous and semicrystalline samples are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01983612
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Modulated differential scanning calorimetry in the glass transition region (1996)
    Springer
    Journal of thermal analysis and calorimetry 47 (1996), S. 1013-1026 
    Details
    ISSN: 1572-8943
    Keywords: activation energy ; calorimetry ; glass transition ; heat capacity ; heat flow calorimeter ; hole theory ; irreversible thermodynamics ; TMDSC ; modulated calorimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Temperature-modulated differential scanning calorimetry (TMDSC) is based on heat flow and represents a linear system for the measurement of heat capacity. As long as the measurements are carried out close to steady state and only a negligible temperature gradient exists within the sample, quantitative data can be gathered as a function of modulation frequency. Applied to the glass transition, such measurements permit the determination the kinetic parameters of the material. Based on either the hole theory of liquids or irreversible thermodynamics, the necessary equations are derived to describe the apparent heat capacity as a function of frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979445
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    Paper (German National Licenses)
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