Macromolecules·· 9 小时前精选AI 评分68
用生物基螺缩醛二酯单体调控 PBAT 热机械性能并提升化学回收性
Introducing Spiroacetal Units to Tune Thermomechanical Properties and Enhance Chemical Recyclability of Poly(butylene adipate- co -terephthalate)
AI 导读
研究者在 PBAT 缩聚中逐步用生物基螺缩醛二酯单体替换己二酸酯和对苯二甲酸酯单元，使聚酯的 Tg 在 –20 至 63 °C 范围内可调，同时降低结晶度和熔点并保持原有分子量。螺缩醛单元在室温甲醇中引导其邻近酯键选择性断裂，产物经过滤回收后可重新聚合，再生材料的组成与性能与原生共聚酯几乎一致。该单体由乙醛酸、生物基季戊四醇和甲醇合成，E-factor 为 0.47。
推荐理由
通过引入刚性螺缩醛单元，PBAT 的 Tg 可在 –20 至 63 °C 间调节，并在室温甲醇中选择性断键实现闭环化学回收。
创新点
把酯键之间的电子差异作为分子设计原则，使共聚单体含量同时决定材料性能与可编程断键位点密度，从而在保持 PBAT 分子量的前提下实现选择性解构与闭环回收。
图表、补充材料与最终表述以原文为准。阅读原文
来源：Macromolecules · doi.org
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