Toda Akihiko
Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8521, Japan.
Polymers (Basel). 2021 Jan 1;13(1):152. doi: 10.3390/polym13010152.
The melting and recrystallization behaviors of poly(butylene terephthalate) (PBT) were investigated using temperature-modulated scanning calorimetry in both fast- and conventional slow-scan modes. With this method, the response of multiple transition kinetics, such as melting and recrystallization, can be differentiated by utilizing the difference in the time constants of the kinetics. In addition to the previous result of temperature-modulated fast-scan calorimetry of polyethylene terephthalate (PET), the supporting evidence of another aromatic polyester, PBT, confirmed the behavior of the exothermic process of recrystallization, which proceeds simultaneously with melting on heating scan in the temperature range of double melting peaks starting just above the crystallization temperature up to the main melting peak. Because the crystallization of PBT is much more pronounced than that of PET, similar behavior of recrystallization was obtained by the conventional temperature-modulated differential scanning calorimetry at a slow-scan rate.
采用温度调制扫描量热法，在快速扫描和传统慢速扫描模式下研究了聚对苯二甲酸丁二醇酯（PBT）的熔融和重结晶行为。通过这种方法，利用动力学时间常数的差异，可以区分多种转变动力学的响应，如熔融和重结晶。除了之前对聚对苯二甲酸乙二酯（PET）进行温度调制快速扫描量热法的结果外，另一种芳香族聚酯PBT的支持证据证实了重结晶放热过程的行为，该过程在加热扫描时与熔融同时进行，温度范围从略高于结晶温度开始到主熔融峰，处于双峰熔融峰范围内。由于PBT的结晶比PET明显得多，因此在慢扫描速率下通过传统的温度调制差示扫描量热法也获得了类似的重结晶行为。
