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Digitale Medien

Temperature modulated calorimetry and dielectric spectroscopy in the glass transition region of polymers (1996)

Hensel, A. ; Dobbertin, J. ; Schawe, J. E. K. ; [weitere]

Springer

Journal of thermal analysis and calorimetry 46 (1996), S. 935-954

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ISSN: 1572-8943

Schlagwort(e): calorimetry ; dielectric ; glass transition ; modulated DSC ; polymers ; relaxation

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01983612

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Digitale Medien

Vapor Pressure Determination by Pressure DSC (1998)

Boller, A. ; Wiedemann, H. G.

Springer

Journal of thermal analysis and calorimetry 53 (1998), S. 431-439

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ISSN: 1572-8943

Schlagwort(e): Knudsen effusion method ; pressure DSC ; steel ball method ; vapor pressure determination

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract A new pressure DSC module (Mettler DSC27HP) and its abilities for vapor pressure determination in the range of subambient pressure to 7 MPa are presented. To compare the new to an established method, vapor pressures of caffeine, naphthalene and o-phenacetin have been determined both by pressure DSC and the Knudsen effusion cell method. These results, including the derived heats of evaporation and heats of sublimation, are compared to literature values.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1010133106907

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