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Polymer crystallization

Isothermal and non-isothermal spherulite growth parameters from optical microscopy and differential scanning calorimetry

  • Polymers
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Abstract

Differential scanning calorimetry (dual furnace, null-balance, DSC) and optical microscopy (OM) have been used to study the isothermal crystallization kinetics of poly(oxymethylene)-POM. The non-isothermal crystallization of the same material has also been studied by optical microscopy.

A very controversial problem is whether the isothermal kinetic parameters may be applied to describe the non-isothermal crystallization. The results show that the kinetic spherulite growth parameters obtained by non-isothermal optical microscopy are, within the experimental errors involved, the same as those obtained by isothermal optical microscopy or isothermal DSC. The importance of this finding is highlighted.

Zusammenfassung

Mittels DSC (Doppelofen, Nullwaage) und Lichtmikroskopie wurde die isotherme Kristallisationskinetik von Poly(oxymethylen)-POM untersucht. Mittels Lichtmikroskopie wurde auch die nichtisotherme Kristallisation dieses Materiales untersucht.

Ein sehr umstrittenes Problem ist, ob die isothermen kinetischen Parameter zur Beschreibung der nichtisothermen Kristallisation verwendet werden können. Die Resultate zeigen, daß die mittels nichtisotherme Lichtmikroskopie erhaltenen kinetischen Sphärolithwachstumsparameter innerhalb der Fehlergrenzen dieselben sind, die mittels isothermer Lichtmikroskopie oder isothermer DSC erhalten wurden. Die Wichtigkeit dieser Erkenntnis wird unterstrichen.

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Authors and Affiliations

  1. Centro de Quimica Pura e Aplicada, CQPA (Inic), Department of Polymer Engineering, Universidade do Minho, 4719, Braga Codex, Portugal

    J. A. Martins, J. J. C. Cruz-Pinto & M. J. Oliveira

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  1. J. A. Martins
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  2. J. J. C. Cruz-Pinto
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  3. M. J. Oliveira
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Martins, J.A., Cruz-Pinto, J.J.C. & Oliveira, M.J. Polymer crystallization. Journal of Thermal Analysis 40, 629–636 (1993). https://doi.org/10.1007/BF02546633

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