Crystallization and Melting Behaviors of Poly(1,4-cyclohexylene Dimethylene Terephthalate) Studied by Fast-Scan Calorimetry

doi:10.11944/j.issn.1000-0518.2020.06.190359

Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (6): 642-649.DOI: 10.11944/j.issn.1000-0518.2020.06.190359

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Crystallization and Melting Behaviors of Poly(1,4-cyclohexylene Dimethylene Terephthalate) Studied by Fast-Scan Calorimetry

MIAO Zhongshuo^a^b,MEN Yongfeng^a^*()

^aState Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences,Changchun 130022,China
^bUniversity of Chinese Academy of Sciences,Beijing 100049,China

Published:2020-06-01 Online:2020-06-08
Contact: MEN Yongfeng
Supported by:
Supported by the National Science Fund for Distinguished Young Scholars(No.51525305)

Abstract

Abstract:

The crystallization and melting behavior of poly(1,4-cyclohexylene dimethylene terephthalate) (PCT) was studied by fast scanning calorimetry (FSC) combined with traditional differential scanning calorimetry (DSC) in the range of near glass transition temperature and melting temperature (100~270 ℃). The crystallization rate of PCT is faster when the supercooling degree is larger. FSC can effectively inhibit the crystallization of PCT during the cooling process while the traditional DSC can avoid the influence of sample degradation on the experimental results under the lower supercooling degrees. The combination of FSC and DSC can well measure the crystallization kinetics of PCT. The experimental results show that the crystallization rate is the fastest at 175 ℃. FSC is also used to measure the melting point dependence of heating rate after isothermal crystallization, and calibrated on the basis of the modeling of melting kinetics for the determination of the melting point at zero heating rate T_m. The Hoffman-Weeks plot of T_m against T_c with the intersection of T_c=T_m suggested the equilibrium melting point $T_m^o$?315 ℃ of chain-extended infinite-size crystals of PCT.

Key words: poly(1,4-cyclohexylene dimethylene terephthalate), isothermal crystallization, fast scanning calorimetry, zero-entropy production melting point, lamella

MIAO Zhongshuo,MEN Yongfeng. Crystallization and Melting Behaviors of Poly(1,4-cyclohexylene Dimethylene Terephthalate) Studied by Fast-Scan Calorimetry[J]. Chinese Journal of Applied Chemistry, 2020, 37(6): 642-649.

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Crystallization and Melting Behaviors of Poly(1,4-cyclohexylene Dimethylene Terephthalate) Studied by Fast-Scan Calorimetry

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