聚（对苯二甲酸丁二醇酯-四亚甲基醚二醇）共聚酯的合成与非等温结晶动力学

Synthesis and Nonisothermal Crystallization Kinetics of Poly(Butylene Terephthalate--Tetramethylene Ether Glycol) Copolyesters.

作者信息

Mao Hsu-I, Chen Chin-Wen, Rwei Syang-Peng

机构信息

Institute of Organic and Polymeric Materials, Research and Development Center of Smart Textile Technology, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao East Road., Taipei 10608, Taiwan.

出版信息

Polymers (Basel). 2020 Aug 24;12(9):1897. doi: 10.3390/polym12091897.

Poly(butylene terephthalate--tetramethylene ether glycol) (PBT--PTMEG) copolymers with PTMEG ranging from 0 to 40 wt% were synthesized through melt polymerization. The structure and composition were supported by Fourier-transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance spectroscopy (H NMR). All samples had excellent thermal stability at a T around 370 °C. Crystallization temperature (T) and enthalpy of crystallization (ΔH) were detected by differential scanning calorimetry (DSC), revealing a decrement from 182.3 to 135.1 °C and 47.0 to 22.1 J g, respectively, with the increase in PTMEG concentration from 0 to 40 wt%. Moreover, nonisothermal crystallization was carried out to explore the crystallization behavior of copolymers; the crystallization rate of PBT reduced gradually when PTMEG content increased. Hence, a decrement in the spherulite growth rate was detected in polarizing light microscope (PLM) observation, observing that the PTMEG could enhance the hindrance in the molecular chain to lower the crystallinity of PBT--PTMEG copolyester. Moreover, thermal properties and the crystallization rate of PBT--PTMEG copolymers can be amended via the regulation of PTMEG contents.

通过熔融聚合合成了聚对苯二甲酸丁二醇酯-四亚甲基醚二醇（PBT-PTMEG）共聚物，其中PTMEG的含量范围为0至40 wt%。通过傅里叶变换红外光谱（FT-IR）和核磁共振光谱（H NMR）对其结构和组成进行了表征。所有样品在约370°C的温度下均具有出色的热稳定性。通过差示扫描量热法（DSC）检测了结晶温度（T）和结晶焓（ΔH），结果表明，随着PTMEG浓度从0 wt%增加到40 wt%，结晶温度从182.3°C降至135.1°C，结晶焓从47.0 J/g降至22.1 J/g。此外，进行了非等温结晶以探究共聚物的结晶行为；随着PTMEG含量的增加，PBT的结晶速率逐渐降低。因此，在偏光显微镜（PLM）观察中检测到球晶生长速率下降，观察到PTMEG可以增强分子链中的位阻，从而降低PBT-PTMEG共聚酯的结晶度。此外，通过调节PTMEG含量可以改善PBT-PTMEG共聚物的热性能和结晶速率。