Modulated temperature DSC studies on the phase transitions of poly(ethylene oxide). Effect of temperature step

K. Pielichowski; K. Flejtuch

Published : 2022-09-17

Vol. 48 No. 6 (2003)

Modulated temperature DSC studies on the phase transitions of poly(ethylene oxide). Effect of temperature step

K. Pielichowski K. Flejtuch

Abstract

Phase behaviour of poly(ethylene oxide) (PEOX) was investigated by modulated temperature differential scanning calorimetry (DSC)-step scan alternating DSC at different temperature steps. Additional features of reversible and non-reversible components during phase transitions can be found. By increasing the temperature step between subsequent isothermal segments the reversible component of the melting process was decreasing. This effect is due to a shift of the equilibrium state of melting-recrystallization reversible processes towards higher degree of conversion that hinders molecular nucleation and recrystallization. Analysis of the non-reversible component during crystallization showed that an increase in the step caused a very distinct increase in the non-reversible component signal due to enhanced crystallization of the less-defected structures which was facilitated by larger temperature gradient.

Keywords

poli(tlenek etylenu) ; różnicowa kalorymetria skaningowa z modulacją temperatury ; wpływ skoku temperaturowego ; przejścia fazowe ; składowa odwracalna i nieodwracalna poly(ethylene oxide) ; modulated temperature differential scanning ; calorimetry ; effect of temperature step ; phase transitions ; reversible and non-reversible components

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Pielichowski, K., & Flejtuch, K. (2022). Modulated temperature DSC studies on the phase transitions of poly(ethylene oxide). Effect of temperature step. Polimery, 48(6), 455–457. Retrieved from https://polimery.ichp.vot.pl/index.php/p/article/view/1884

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