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  • 1
    Electronic Resource
    Electronic Resource
    Isothermal Crystallisation of PCL Studied by Temperature Modulated Dynamic Mechanical and TMDSC Analysis (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 1155-1161 
    Details
    ISSN: 1572-8943
    Keywords: crystallisation ; DMA ; DSC ; PCL ; polymer ; temperature modulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Temperature modulated dynamic mechanical analysis (TMDMA) was performed in the same way as temperature modulated DSC (TMDSC) measurements. As in TMDSC TMDMA allows the investigation of reversible and non-reversible phenomena during crystallisation of polymers. The advantage of TMDMA compared to TMDSC is the high sensitivity for small and slow changes in crystallinity, e.g. during re-crystallisation. The combination of TMDMA and TMDSC yields new information about local processes at the surface of polymer crystallites. It is shown that during and after isothermal crystallisation the surface of the individual crystallites is in equilibrium with the surrounding melt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010161113295
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  • 2
    Electronic Resource
    Electronic Resource
    Reversible Melting During Crystallization of Polymers Studied by Temperature Modulated Techniques (TMDSC, TMDMA) (2000)
    Springer
    Journal of thermal analysis and calorimetry 60 (2000), S. 807-820 
    Details
    ISSN: 1572-8943
    Keywords: calorimetry ; crystallization ; PCL ; PEEK ; PEN ; PET ; polymer ; temperature modulation ; TMDMA ; TMDSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Quasi-isothermal temperature modulated DSC and DMA measurements (TMDSC and TMDMA, respectively) were performed to determine heat capacity and shear modulus as a function of time during crystallization. Non-reversible and reversible phenomena in the crystallization region of polymers can be observed. The combination of TMDSC and TMDMA yields new information about local processes at the surface of polymer crystals, like reversible melting. Reversible melting can be observed in complex heat capacity and in the amplitude of shear modulus in response to temperature perturbation. The fraction of material involved in reversible melting, which is established during main crystallization, keeps constant during secondary crystallization for PCL PET and PEEK. This shows that also after long crystallization times the surfaces of the individual polymer crystallites are in equilibrium with the surrounding melt. Simply speaking, polymer crystals are ‘living crystals’.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010195321797
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  • 3
    Electronic Resource
    Electronic Resource
    Crystallization of Polymers Studied by Temperature Modulated Calorimetric Measurements at Different Frequencies (2000)
    Springer
    Journal of thermal analysis and calorimetry 59 (2000), S. 279-288 
    Details
    ISSN: 1572-8943
    Keywords: AC calorimetry ; crystallization ; PCL ; polymer ; temperature modulation ; TMDSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Quasi-isothermal temperature modulated DSC (TMDSC) were performed during crystallization to determine heat capacity as function of time and frequency. Non-reversible and reversible phenomena in the crystallization region of polymers were distinguished. TMDSC yields new information about the dynamics of local processes at the surface of polymer crystals, like reversible melting. The fraction of material involved in reversible melting, which is established during main crystallization, keeps constant during secondary crystallization for polycaprolactone (PCL). This shows that also after long crystallization times the surfaces of the individual crystallites are in equilibrium with the surrounding melt. Simply speaking, polymer crystals are ‘living crystals’. A strong frequency dependence of complex heat capacity can be observed during and after crystallization of polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010108617592
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