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Title Enthalpy of formation and disordering temperature of transient monotropic liquid crystals of poly(butylene 2,6-naphthalate)
Date 05.12.2018
Number 55945
Abstract Melt-crystallization of poly(butylene 2,6-naphthalate) (PBN) at temperatures lower than about 160·°C follows Ostwalds rule of stages via intermediate formation of a smectic liquid crystalline phase (LC-phase). The transient LC-phase has been isolated by interruption of the isothermal crystallization process at 140·°C at sub-second timescale, and then its disordering was analyzed on heating at a rate of 2000 K/s, which suppresses the transition into a-crystals. The disordering temperature of the LC-mesophase is slightly lower than 200·°C, and as such 20–30·K lower than the melting temperature of a-crystals formed from the LC-phase at 140·°C. Analysis of the bulk enthalpy of formation of the LC-phase revealed that it covers only 20–25% of the total bulk enthalpy of crystallization, which is considered further proof of its smectic nature.
Publisher Polymer
Identifier
Citation Polymer 158 (2018) 77-82
DOI https://doi.org/10.1016/j.polymer.2018.10.037
Authors Androsch, R. ; Soccio, M. ; Lotti, N. ; Jehnichen, D. ; Göbel, M. ; Schick, C.
Tags poly(butylene 2 6-naphthalate) liquid crystal crystallization fast scanning chip calorimetry

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