Liu Bo, Guan Tonghui, Wu Gang, Fu Ye, Weng Yunxuan
College of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, China.
Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China.
Polymers (Basel). 2022 Apr 8;14(8):1515. doi: 10.3390/polym14081515.
Poly (butylene adipate-co-terephthalate) (PBAT) and poly (butylene succinate) (PBS) are polyester materials with excellent biodegradability under soil and compost conditions. However, the research on their degradation process in the marine environment is scarce. In this study, a more realistic simulation marine environment with sediment and marine organisms was developed, followed by investigation of the biodegradation behavior of PBAT and PBS mulch in it. The effect of aromatic structure, carboxyl end group content, molecular weight, and inorganic fillers on the degeneration of mulch was characterized by the changes in appearance, chemical structure, thermal properties, and crystallinity via Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, gel permeation chromatography, element analysis, and X-ray photoelectron spectroscopy. The molecular weight of polyester blends decreased, while the content of the C-O bond in the composites increased, indicating that the samples indeed degraded. The degradation rate was measured with the CO release amount. The aliphatic polyester structure, lower molecular weight, higher carboxyl end group content, and the involvement of inorganic fillers facilitate the disintegration of polyester in the marine environment, which provides an effective method to construct materials with controllable biodegradable performance.
聚己二酸丁二醇酯-对苯二甲酸丁二醇酯（PBAT）和聚丁二酸丁二醇酯（PBS）是在土壤和堆肥条件下具有优异生物降解性的聚酯材料。然而，关于它们在海洋环境中降解过程的研究却很少。在本研究中，构建了一个包含沉积物和海洋生物的更贴近实际的模拟海洋环境，随后研究了PBAT和PBS覆盖膜在其中的生物降解行为。通过傅里叶变换红外光谱、差示扫描量热法、热重分析、凝胶渗透色谱法、元素分析和X射线光电子能谱，从外观、化学结构、热性能和结晶度的变化来表征芳香结构、羧基端基含量、分子量和无机填料对覆盖膜降解的影响。聚酯共混物的分子量降低，而复合材料中C-O键的含量增加，表明样品确实发生了降解。通过CO释放量来测定降解速率。脂肪族聚酯结构、较低的分子量、较高的羧基端基含量以及无机填料的参与促进了聚酯在海洋环境中的分解，这为构建具有可控生物降解性能的材料提供了一种有效方法。
