Lim Daegyu, Park Su-Il
Department of Packaging, Yonsei University, Wonju 26493, Republic of Korea.
Polymers (Basel). 2023 Feb 24;15(5):1133. doi: 10.3390/polym15051133.
Poly(butylene sebacate-co-terephthalate) (PBSeT) has generated attention as a promising biopolymer for preparing bioplastics. However, there are limited studies on the synthesis of PBSeT, impeding its commercialization. Herein, with a view to addressing this challenge, biodegradable PBSeT was modified using solid state polymerization (SSP) with various ranges of time and temperature. The SSP used three different temperatures below the melting temperature of PBSeT. The polymerization degree of SSP was investigated using Fourier-transform infrared spectroscopy. The changes in the rheological properties of PBSeT after SSP were investigated using a rheometer and an Ubbelodhe viscometer. Differential scanning calorimetry and X-ray diffraction showed that the crystallinity of PBSeT was higher after SSP. The investigation revealed that after SSP for 40 min at 90 °C, PBSeT exhibited higher intrinsic viscosity (increased from 0.47 to 0.53 dL/g), crystallinity, and complex viscosity than PBSeT polymerized at other temperatures. However, a high SSP processing time resulted in a decrease in these values. In this experiment, SSP was most effectively performed in the temperature range closest to the melting temperature of PBSeT. This indicates that SSP could be a facile and rapid method for improving the crystallinity and thermal stability of synthesized PBSeT.
聚（癸二酸丁二醇酯 - 对苯二甲酸丁二醇酯）（PBSeT）作为一种有前途的用于制备生物塑料的生物聚合物已引起关注。然而，关于PBSeT合成的研究有限，这阻碍了其商业化。在此，为了应对这一挑战，采用固态聚合（SSP）在不同的时间和温度范围内对可生物降解的PBSeT进行了改性。SSP使用了低于PBSeT熔点的三种不同温度。利用傅里叶变换红外光谱研究了SSP的聚合度。使用流变仪和乌氏粘度计研究了SSP后PBSeT流变性能的变化。差示扫描量热法和X射线衍射表明，SSP后PBSeT的结晶度更高。研究表明，在90℃下进行40分钟的SSP后，PBSeT表现出比在其他温度下聚合的PBSeT更高的特性粘度（从0.47增加到0.53 dL/g）、结晶度和复数粘度。然而，高的SSP处理时间导致这些值下降。在本实验中，SSP在最接近PBSeT熔点的温度范围内最有效地进行。这表明SSP可能是一种简便快速的方法，用于提高合成PBSeT的结晶度和热稳定性。
