Crystallization kinetics in the chiral compound showing the vitrification of the smectic CA* phase for moderate cooling rates

Autor: Aleksandra Deptuch, Ewa Juszyńska-Gałązka, Małgorzata Jasiurkowska-Delaporte, Anna Drzewicz, Marcin Piwowarczyk, Magdalena Urbańska
Rok vydání: 2023
Předmět:
Zdroj: Phase Transitions. 96:166-185
ISSN: 1029-0338
0141-1594
Popis: The crystallization of the 3F5FPhF6 compound from the liquid crystalline antiferroelectric smectic CA* phase is investigated in various conditions using differential scanning calorimetry and polarizing optical microscopy. The kinetics of isothermal melt and cold crystallization is studied on the basis of the Avrami model. The kinetics of non-isothermal cold crystallization is analysed using the Ozawa model and the activation energy is determined by the Augis-Bennett, Friedman’s differential isoconversional and Matusita methods. The border temperature between the diffusion-controlled crystallization and thermodynamically-controlled crystallization is estimated. The high fragility index of 105 is determined from the α-process in the smectic CA* phase by the broadband dielectric spectroscopy. The metastable, conformationally disordered crystal phase, forming only via cold crystallization, is reported.
Databáze: OpenAIRE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje