Phase Transition and Melt-Recrystallization Behavior of Poly(Butylene Adipate) Investigated by Simultaneous Measurements of Wide-Angle X-Ray Diffraction (WAXD) and Differential Scanning Calorimetry (DSC)

Polymers

Mengfan Wang¹  Weiyu Cao² 

[1] Department of Future Industry-Oriented Basic Science and Materials, Toyota Technological Institute, Tempaku, Nagoya 461-8511, Japan;State Key Laboratory of Organic-Inorganic Composites, College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;

关键词: poly(butylene adipate);    phase transition;    melt-recrystallization;    temperature dependence;    wide-angle x-ray diffraction;   

DOI  :  10.3390/polym12010075

来源: DOAJ

【 摘 要 】

Simultaneous measurements of wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) were carried out to investigate the phase transition and melting behaviors of poly(butylene adipate) (PBA). Thermal expansion changes along the a and b axes of the β form unit cell are different from each other during the heating process. At the beginning of the β to α_H (high-temperature α phase) phase transition, the β phase melts very fast, while the recrystallization of the α_H phase is delayed and slowed. With the further increment of the temperature, the melting rate of the β phase slows down, while the recrystallization of the α_H phase accelerates. The diffraction peak intensity ratios of the β(020):β(110) and α_H(020):α_H(110) diffraction peaks during the first heating process have similar value. However, the above value is different from the value of α(020):α(110) during the following melt-crystallization process. This difference comes from the different orientations of the crystal lattices of the α and α_H(β) crystals to the substrate plane, which indicates that the α_H phase inherits the orientation of the β phase during phase transition and the orientation of α_H form crystals is different from the α form crystals that crystallized from the melt.

【 授权许可】

Unknown