Poly(trimethylene terephthalate) copolyester containing ethylene glycol moieties. Part 1: Crystallization kinetics and melting behavior |
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| Authors: | Chi-Yun Ko Chuan-Liang Wang Ren-Yi Chen |
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| Affiliation: | a Institute of Materials Science and Engineering, National Sun Yat-Sen University, 70 Lien Hai Road, Kaohsiung 80424, Taiwan, ROC
b Union Chemical Laboratories, Industrial Technology Research Institute, Hsinchu 300, Taiwan, ROC |
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| Abstract: | A copolyester was characterized to have 91 mol% trimethylene terephthalate unit and 9 mol% ethylene terephthalate unit in a random sequence by using 13C NMR. Differential scanning calorimeter (DSC) was used to investigate the isothermal crystallization kinetics in the temperature range (Tc) from 180 to 207 °C. The melting behavior after isothermal crystallization was studied by using DSC and temperature modulated DSC (TMDSC). The exothermic behavior in the DSC and TMDSC curves gives a direct evidence of recrystallization. No exothermic flow and fused double melting peaks at Tc = 204 °C support the mechanism of different morphologies. The Hoffman-Weeks linear plot gave an equilibrium melting temperature of 236.3 °C. The kinetic analysis of the growth rates of spherulites and the morphology change from regular to banded spherulites indicated that there existed a regime II → III transition at 196 °C. |
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| Keywords: | Copolyester NMR Crystallization |
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