A series of fully bio-based poly(butylene-co-isosorbide sebacate) (PBISe) copolyesters are synthesized from sebacic acid (Se), 1,4-butanediol (BDO), and isosorbide (IS) via a two-step melt polycondensation method. The synthesized PBISe copolyesters are characterized using various techniques, including H NMR spectroscopy; GPC; FT-IR spectroscopy; HR-XRD; DSC; TGA; transparency, tensile, and tear strength testing; and rheological property analysis. The M and M values of the PBISe copolyesters are 126,000–148,000 and 50,000–63,500, respectively. The introduction of the rigid, bulky, and asymmetric IS unit disrupts the regularity and mobility of the polymer chain, resulting in a nearly linear reduction of the melting temperature, enthalpy, and crystallinity, from 66 to 42 °C, 81 to 37 J/g, and 41.4 to 19.0%, respectively, with an increase in the IS content from 0 to 30 mol% relative to the total diol concentration. The reduction of crystallinity without the formation of new crystal planes with the poly(butylene sebacate (PBSe) copolyester containing 30 mol% IS resulted in improved transparency (73.8% transmittance at 600 nm). Additionally, the PBISe copolyesters exhibit T and T in excess of 405 °C and 425 °C, respectively, as well as shear-thinning and viscous melt-flow behaviors, making them suitable for melt processing. The tensile strength and elongation at break of the hot-pressed films of the IS-added PBISe copolyesters with ≤16% content are 31.6–36.3 MPa and 639.2–809.9%, respectively. The developed PBISe copolyesters have great potential as bio-based, biodegradable, and flexible materials for packaging and coating applications with low processing temperatures.

中文翻译：

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生物基异山梨醇衍生的新型可生物降解柔性共聚酯的研究：聚（丁烯-共-异山梨醇癸二酸酯）的合成和表征

由癸二酸 (Se)、1,4-丁二醇 (BDO) 和异山梨醇 (IS) 通过两步熔融缩聚合成一系列全生物基聚(丁烯-共-异山梨醇癸二酸酯) (PBISe) 共聚酯方法。使用各种技术对合成的 PBISe 共聚酯进行表征，包括 1H NMR 光谱；凝胶渗透色谱；傅立叶变换红外光谱； HR-X射线衍射；差示扫描量热法；热重分析；透明度、拉伸和撕裂强度测试；和流变特性分析。 PBISe共聚酯的M和M值分别为126,000-148,000和50,000-63,500。刚性、庞大且不对称的 IS 单元的引入破坏了聚合物链的规律性和活动性，导致熔融温度、焓和结晶度几乎线性降低，从 66 至 42 °C、81 至 37 J/相对于总二醇浓度，IS 含量从 0 mol% 增加到 30 mol%，分别为 41.4% 和 41.4% 到 19.0%。含有 30 mol% IS 的聚癸二酸丁二醇酯 (PBSe) 共聚酯在不形成新晶面的情况下降低了结晶度，从而提高了透明度（600 nm 处的透射率为 73.8%）。此外，PBISe 共聚酯表现出 T 和 T 过量添加 IS 的 PBISe 热压薄膜的拉伸强度和断裂伸长率分别为 405 °C 和 425 °C，以及剪切稀化和粘性熔体流动行为。含量≤16%的共聚酯分别为31.6-36.3 MPa和639.2-809.9%，所开发的PBISe共聚酯作为生物基、可生物降解的柔性材料在低加工温度的包装和涂料应用中具有巨大的潜力。