Thermal properties. DSC analysis of poly(xylitol sebacate-co-butylene sebacate) PXBS

In this work, a bio-based copolyester with good mechanical properties was synthesized and characterized in terms of structure, main properties and biodegradability Determining the chemical structure of such materials is important to understand their behavior and properties. Performing an extraction of insoluble cross-linked polymer using di erent solvents allowed us to analyze how the polymer behaves when subjected to di erent chemical environments, and to obtain soluble samples suitable for more in-depth analysis. Chemical structure of poly (xylitol sebacate-co-butylene sebacate) was determined by a 1H NMR and FTIR analysis of both prepolymer gel sample and samples obtained by extraction of cross-linked polymer using di erent solvents. Block structure of the copolymer was confirmed by both NMR and DSC. Gel fraction, swelling value, water contact angle, and mechanical properties were also analyzed. Biodegradability of this material was confirmed by performing enzymatic and hydrolytic degradation. Synthesizing sugar-alcohol based copolyester using three monomers leads to obtaining a material with interesting chemical structure and desirable mechanical properties comparable to conventional elastomers.

本研究合成了一种具备优良力学性能的生物基共聚酯，并从结构、核心性能及生物降解性三个维度对其进行了表征。明确该类材料的化学结构，是理解其性能与行为表现的关键。采用多种溶剂对不溶性交联聚合物进行萃取，既可分析聚合物在不同化学环境下的行为特性，也可获得适用于更深入分析的可溶性样品。通过对预聚物凝胶样品，以及经多种溶剂萃取交联聚合物所得样品的1H核磁共振（1H NMR）与傅里叶变换红外光谱（FTIR）分析，确定了聚(癸二酸木糖醇酯-co-癸二酸丁二醇酯)的化学结构。借助核磁共振与差示扫描量热法（DSC），证实了该共聚物的嵌段结构。同时还对凝胶分率、溶胀值、水接触角及力学性能进行了表征分析。通过酶解与水解降解实验，证实了该材料的生物降解性能。采用三种单体合成糖醇基共聚酯，可获得兼具独特化学结构与可媲美传统弹性体的优异力学性能的材料。