浙江大学张兴宏团队开发一条简便且前所未有的获得耐热甲醛衍生聚酯库的途径，实现环缩醛和酸酐的高活性和选择性共聚。相关研究成果发表在2022年1月18日出版的《德国应用化学》。

开发生产聚酯的新策略可以扩大可生物降解材料的种类。

该文中，研究人员首次公开了环缩醛（由甲醛和二醇制成）和酸酐的交替共聚，使用5个环缩醛和9个酸酐得到45种前所未有的聚酯。在较宽的反应温度范围内（25至140℃），各种无金属Lewis/Brnsted酸作为高活性催化剂通过阳离子机理进行这些共聚。

令人感兴趣的是，动力学研究表明，环缩醛和酸酐的共聚将“环缩醛-聚缩醛”的化学平衡向左移动，从而生成交替度大于99%的聚酯。所得聚酯具有高氧含量（[O]：[C]高达6:7）、分子量2.0-33.3 kDa、窄多分散性1.2-1.5、低玻璃化转变温度（-64至-27℃）以及高分解温度（275至324℃）。

附：英文原文

Title: A Facile and Unprecedented Route to a Library of Thermostable Formaldehyde-derived Polyesters: Highly Active and Selective Copolymerization of Cyclic Acetals and Anhydrides

Author: Xun Zhang, Chengjian Zhang, Xinghong Zhang

Issue&Volume: 2022-01-18

Abstract: The development of new strategies for producing polyesters can expand the category of biodegradable materials. Here, we disclose the alternating copolymerization of cyclic acetals (made from formaldehyde and diols) and anhydrides for the first time, using 5 cyclic acetals and 9 anhydrides to afford 45 unprecedented polyesters. At a wide range of reaction temperatures (25 to 140°C), diverse metal-free Lewis/Brnsted acids are highly active catalysts for these copolymerizations via the cationic mechanism. Of interest, kinetic studies indicate that the copolymerization of cyclic acetals and anhydrides shifts the chemical equilibrium of “cyclic acetals polyacetals” to the left, thus yielding polyesters with up to >99% alternating degree. The obtained polyesters possess high oxygen content ([O]:[C] up to 6:7), molecular weights of 2.0-33.3 kDa, narrow polydispersities of 1.2-1.5, low glass transition temperatures (-64 to -27°C), as well as high decomposition temperatures (275 to 324°C).

DOI: 10.1002/anie.202117316

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202117316