Melt Crystallization Behavior and Spherulitic Morphology of Poly(Trimethylene Terephthalate)/Poly(Propylene Glycol) Copolymers with Different Poly(Propylene Glycol) Molecular Weights
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引用次数: 1
Abstract
ABSTRACT Poly(trimethylene terephthalate)/poly(propylene glycol) (PTT/PPG) copolymers with different PPG molecular weights (400–4,000 g /mol) were successfully synthesized and characterized. Double melting endotherms during isothermal melt crystallization were observed by differential scanning calorimetry. Middle-temperature melting endotherms in all copolymers were stronger than that in PTT homopolymer and became smaller with the increasing PPG molecular weight. Nonisothermal crystallization kinetics of all samples were analyzed by Ozawa and Mo models. Polarized optical microscopy micrographs revealed that ring-banded spherulitic morphology was relatively easier to be observed in copolymers with higher PPG molecular weight at lower crystallization temperature, and PPG molecular weight nearly had no influence on the band spacing. GRAPHICAL ABSTRACT
成功合成了不同PPG分子量(400 ~ 4000 g /mol)的聚对苯二甲酸三甲酯/聚丙二醇(PTT/PPG)共聚物，并对其进行了表征。用差示扫描量热法观察了等温熔体结晶过程中的双熔融吸热现象。各共聚物的中温熔点均大于PTT均聚物，且随着PPG分子量的增加而减小。采用Ozawa和Mo模型分析了所有样品的非等温结晶动力学。偏光显微镜显微图显示，在较低结晶温度下，较高PPG分子量的共聚物更容易形成环带状球晶形态，而PPG分子量对带间距几乎没有影响。图形抽象
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