The crystallization rate and morphological structure of poly(ethylene/trimethylene terephthlate) copolyesters under isothermal melt-crystallization and cold-crystallization
作者： Tien-Wei Shyr , Chia-Hsin Tung , Wen-Sheng Cheng , Cheng-Che Yang
DOI: 10.1007/S10965-013-0186-5
关键词: Amorphous solid 、 Crystal 、 Chemical engineering 、 Differential scanning calorimetry 、 Nucleation 、 Polymer chemistry 、 Lamella (surface anatomy) 、 Isothermal process 、 Crystallinity 、 Crystallization 、 Materials science
摘要: The crystallization behavior and morphological structure of isothermally melt-crystallized cold-crystallized poly(ethylene/trimethylene terephthalate) (ET) copolyesters were investigated by differential scanning calorimetry, wide-angle X-ray diffraction, small-angle scattering. At a given temperature, the rate cold was found to be faster than that melt crystallization. Avrami analysis revealed nuclei formed rapidly during cooling process. This suggests rapid athermal nucleation mechanism contributes cold-crystallization process ET copolyesters. crystal thickness (l c ), amorphous layer a long period (L) ET53 ET82 between isothermal melt-crystallization had no significant difference. values linear crystallinity (ϕ lin) for PET, PTT, under conditions similar. means random distribution constitutional repeating unit in molecular chain not exclusively lamella formation.
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