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Crystallization kinetics and melting behavior of poly[(trimethylene terephthalate)‐ co ‐(29 mol % ethylene terephthalate)] copolyester
Author(s) -
Chen Ming,
Ko ChiYun,
Wang HuiChen,
Chen RenYi,
Wang ChuanLiang,
Lu HsinYing,
Tseng IMin
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.29671
Subject(s) - copolyester , materials science , differential scanning calorimetry , crystallization , lamellar structure , isothermal process , ethylene , polymer chemistry , kinetics , recrystallization (geology) , atmospheric temperature range , crystallography , thermodynamics , chemical engineering , composite material , chemistry , organic chemistry , polyester , paleontology , physics , quantum mechanics , biology , engineering , catalysis
The copolyester was characterized as having 71 mol % trimethylene terephthalate units and 29 mol % ethylene terephthalate units in a random sequence according to the NMR spectra. Differential scanning calorimeter (DSC) was used to investigate the isothermal crystallization kinetics in the temperature range ( T c ) from 130 to 170°C. The melting behavior after isothermal crystallization was studied using DSC and temperature‐modulated DSC by varying the T c , the crystallization time, and the heating rate. The DSC thermograms and wide‐angle X‐ray diffraction patterns reveal that the complex melting behavior involves melting‐recrystallization‐remelting and different lamellar crystals. As the T c increases, the contribution of recrystallization gradually falls and finally disappears. A Hoffman‐Weeks linear plot yields an equilibrium melting temperature of 198.7°C. The kinetic analysis of the growth rates of spherulites and the change in the morphology from regular to banded spherulites indicate that a regime II→III transition occurs at 148°C. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009