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Effects of γ-rays on the crystallization behaviour of lower poly(ethylene glycol) fractions

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  • Polymer Science
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Summary

Crystallization isotherms of three- γ-irradiated low molecular weight poly(ethylene glycol), PEG, fractions were determined dilatometrically. Samples investigated had number average molecular weights of 1500, 4000 and 35000. Crystallization kinetics were analyzed according to theAvrami formalism, then value being 2 for unirradiated samples. With irradiation, the slopes of isotherms changed abruptly at about 30% crystallinity, after this crystallinity then value became equal to 1. This behaviour is explained by the diffusion control of the growth mechanism.

Zusammenfassung

Die Kristallisationsisothermen von drei γ-bestrahlten niedrig-molekularen Polyäthylenglykolfraktionen wurden dilatometrisch bestimmt. Die untersuchten Proben hatten ein zahlenmäßig durchschnittliches Molekulargewicht von 1500, 4000 und 35000. Die Kristallisationskinetik wurde mittels einer Avrami-Analyse untersucht und dern-Wert für nicht bestrahlte Proben als 2 ermittelt. Durch Bestrahlung ändern sich die Neigungen der Isothermenab einem, Kristallisasationsgrad von etwa 30 Prozent abrupt, und der Wert von n wird gleich eins. Dieses Verhalten wird durch einen diffusionskontrollierten Wachstumsmechanismus erklärt.

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Authors and Affiliations

  1. Department of Chemistry, University of Hacettepe, Beytepe, Ankara, Turkey

    O. Güven & C. Şenvar

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  1. O. Güven
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  2. C. Şenvar
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Güven, O., Şenvar, C. Effects of γ-rays on the crystallization behaviour of lower poly(ethylene glycol) fractions. Colloid & Polymer Sci 257, 23–26 (1979). https://doi.org/10.1007/BF01539012

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  • DOI: https://doi.org/10.1007/BF01539012

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