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  • crystallization  (1)
  • glass transition temperature  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Crystallization and Melting of β-Nucleated Isotactic Polypropylene (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 1047-1057 
    Details
    ISSN: 1572-8943
    Keywords: β-nucleating agent ; β-polypropylene ; crystallization ; degree of crystallinity ; melt enthalpies ; melting ; recrystallization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ca salts of suberic (Ca-Sub) and pimelic acid (Ca-Pim) were synthesized and used as β-nucleating agents in different grades of isotactic polypropylene (IPP). Propylene homo-, random- and block-copolymers containing these additives crystallize principally in pure β-modification as demonstrated in isothermal and non-isothermal crystallization experiments. Ca-Sub proved the most effective β-nucleating agent known, so far. It broadens the upper crystallization temperature range of pure β-IPP formation up to 140°C. The effect of the additives on the crystallization and melting characteristics of the polymers was studied. The degree of crystallinity of the β-modification was found to be markedly higher than that of α-IPP. High temperature melting peak broadening was first observed and discussed in literary results regarding the same phenomenon for α-IPP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010132306934
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamical Mechanical Thermoanalysis of High Performance Reinforced Materials Influences and Problems (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 1147-1154 
    Details
    ISSN: 1572-8943
    Keywords: composites ; DMTA ; glass transition temperature ; Round-Robin-test
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A sensitive method to characterize the thermomechanical behaviour of fiber reinforced composites is the dynamic mechanical thermoanalysis (DMTA) method. A Round-Robin-test with five different institutes was conducted to determine the role of the fiber orientation, processing conditions, test apparatus, the mode of loading, and the matrix materials on the determination of the glass transition temperature (Tg). The result shows that the DMTA is a suitable method to analyze Tg of long fiber composites. However, some major problems have to be taken into consideration: - A direct comparison of results from different DMTA-systems is not possible - The real temperatures in the specimens deviate from the temperatures displayed by the DMTA measuring system - There is no clear and common evaluation method for the glass transition temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010109129224
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    Paper (German National Licenses)
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