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  • glass transition  (2)
  • poly(α-n-alkyl-L-aspartate)s  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The application of modulated differential scanning calorimetry to the glass transition (1996)
    Springer
    Journal of thermal analysis and calorimetry 47 (1996), S. 103-115 
    Details
    ISSN: 1572-8943
    Keywords: glass transition ; MDSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The modulated differential scanning calorimetry (MDSC) technique superimposes upon the conventional DSC heating rate a sinusoidally varying modulation. The result of this modulation of the heating rate is a periodically varying heat flow, which can be analysed in various ways. In particular, MDSC yields two components (‘reversing’ and ‘non reversing’) of the heat flow, and a phase angle. These each show a characteristic behaviour in the glass transition region, but their interpretation has hitherto been unclear. The present work clarifies this situation by a theoretical analysis of the technique of MDSC, which introduces a kinetic response of the glass in the transition region. This analysis is able to describe all the usual features observed by MDSC in the glass transition region. In addition, the model is also able to predict the effects of the modulation variables, and some of these are discussed briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01982690
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  • 2
    Electronic Resource
    Electronic Resource
    Measuring the Glass Transition of Thermosets by Alternating Differential Scanning Calorimetry (2000)
    Springer
    Journal of thermal analysis and calorimetry 59 (2000), S. 289-303 
    Details
    ISSN: 1572-8943
    Keywords: epoxy resins ; glass transition ; thermosets ; TMDSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The glass transition temperature of thermosets is determined by alternating differential scanning calorimetry (ADSC), which is a temperature modulated DSC technique. The different values of the glass transition obtained from heat flow measurements (total and reversible) and heat capacity (modulus of the complex heat capacity) are analysed and compared with the values obtained by conventional DSC. The effect of the sample mass on the values of Tg, heat capacity and phase angle has been analysed. The effect of the thermal contact between sample and pan has been studied using samples cured directly inside the pan and disc-shaped samples of different thickness. The results obtained for the thermal properties and the phase angle are compared and analysed. The modulus of the complex heat capacity enables the determination of the dynamic glass transition, Tgα, which is frequency dependent. The apparent activation energy ofthe relaxation process associated with the glass transition has been evaluated from the dependence of Tgα on the period of the modulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010160601663
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal behavior of poly(α-n-alkyl β-L-aspartate)s (1997)
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 693-702 
    Details
    ISSN: 1572-8943
    Keywords: DSC ; helical conformation ; poly(α-n-alkyl-L-aspartate)s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of poly(α-n-alkyl β-L-aspartate)s (n being the number of carbon atoms in the linear alkyl side chain, withn=1, 2, 4, 6, 8, 12, 18 and 22), was studied by differential scanning calorimetry and thermogravimetric analysis. The effect of the length of the alkyl group on thermal properties such as stability, melting and crystallization of side chains, was investigated. For the polymers with n≥12, two endothermic peaks at T1 and T2 were detected separating three distinct phases A, B and C. The peak at T1 corresponds to the melting of the crystallized paraffinic side chains (transition A-B), and the peak: at T2 may be attributed to a transition (B-C), implying a liquid crystal phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01996753
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    Paper (German National Licenses)
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