School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China.
Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou 213164, China.
Int J Mol Sci. 2023 Mar 29;24(7):6451. doi: 10.3390/ijms24076451.
At present, the development and usage of degradable plastics instead of traditional plastics is an effective way to solve the pollution of marine microplastics. Poly (butylene adipate-co-terephthalate) (PBAT) is known as one of the most promising biodegradable materials. Nevertheless, the degradation rate of PBAT in water environment is slow. In this work, we successfully prepared four kinds of high molecular weight polyester copolyesters (PBATGA) via quaternary copolymerization. The results showed that the intrinsic viscosity of PBATGA copolymers ranged from 0.74 to 1.01 dL/g with a glycolic acid content of 0-40%. PBATGA copolymers had excellent flexibility and thermal stability. The tensile strength was 5~40 MPa, the elongation at break was greater than 460%, especially the elongation at break of PBATGA10 at 1235%, and the thermal decomposition temperature of PBATGA copolyesters was higher than 375 °C. It was found that PBATGA copolyester had a faster hydrolysis rate than PBAT, and the weight loss of PBATGA copolymers showed a tendency of pH = 12 > Lipase ≈ pH = 7 > pH = 2. The quaternary polymerization of PBAT will have the advantage of achieving industrialization, unlike the previous polymerization process. In addition, the polymerization of PBATGA copolyesters not only utilizes the by-products of the coal chemical industry, but also it can be promising in the production of biodegradable packaging to reduce marine plastic pollution.
目前，开发和使用可生物降解塑料代替传统塑料是解决海洋微塑料污染的有效方法。聚（己二酸丁二醇酯-对苯二甲酸酯）（PBAT）被认为是最有前途的可生物降解材料之一。然而，PBAT 在水环境中的降解速度较慢。在这项工作中，我们通过四元共聚成功制备了四种高分子量聚酯共聚酯（PBATGA）。结果表明，PBATGA 共聚物的特性粘度在 0.74 至 1.01 dL/g 范围内，其丙交酯含量为 0-40%。PBATGA 共聚物具有优异的柔韧性和热稳定性。拉伸强度为 5~40 MPa，断裂伸长率大于 460%，特别是 PBATGA10 的断裂伸长率为 1235%，PBATGA 共聚酯的热分解温度高于 375°C。发现 PBATGA 共聚酯的水解速率比 PBAT 快，PBATGA 共聚物的失重呈现出 pH = 12 > 脂肪酶 ≈ pH = 7 > pH = 2 的趋势。与以前的聚合工艺不同，PBAT 的四元聚合将具有实现工业化的优势。此外，PBATGA 共聚酯的聚合不仅利用了煤化工的副产物，而且在生产可生物降解包装方面也具有很大的潜力，可以减少海洋塑料污染。
