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Precise Access to Ultrahigh-Molecular-Weight Polymers by Ylide-Functionalized Phosphine-Based Frustrated Lewis Pairs
Macromolecules ( IF 5.1 ) Pub Date : 2024-11-04 , DOI: 10.1021/acs.macromol.4c01801
Yun Bai, Shiquan Li, Jianghua He, Changfei He, Yibao Li, Zhonggao Zhou, Yiwang Chen, Yuetao Zhang

Lewis pair polymerization (LPP) is an advanced polymerization technique known for its ability to synthesize ultrahigh-molecular-weight (UHMW) polymers under mild conditions with remarkable efficiency and precise control. In this study, a strong electron-donor ylide-functionalized phosphine, (1-(diethylphosphanyl)ethylidene)triphenyl-λ5-phosphane (YFP2), is introduced as a Lewis base (LB). It is combined with a sterically hindered moderately acidic Lewis acid (LA), (4-Me-2,6-tBu2-C6H2O)AliBu2 ((BHT)AliBu2), to prepare a frustrated Lewis pair (FLP) catalyst for the living methacrylates polymerization. The living character of this polymerization has been confirmed through various key observations: successful chain-extension experiments, a linear increase in the number-average molecular weight (Mn) of the polymer corresponding to monomer conversion and the ratio of monomer to initiator, and the development of distinct di- and triblock copolymers using different comonomer addition sequences. Importantly, this FLP catalyst system has successfully synthesized UHMW poly(methyl methacrylate) (PMMA) with Mn values reaching up to 2935 kg/mol and narrow molecular weight distribution (Đ) at room temperature (RT). This achievement establishes a new record for the highest reported Mn for PMMA using a living/controlled LPP system.

中文翻译:


通过酰化物官能化的基于膦化氢的 Frustrated Lewis 对精确获得超高分子量聚合物



路易斯对聚合 (LPP) 是一种先进的聚合技术,以其在温和条件下合成超高分子量 (UHMW) 聚合物的能力而闻名,具有卓越的效率和精确的控制。在这项研究中,强电子供体亚甲基官能化磷化氢 (1-(二乙基膦基)亚乙基)三苯基-λ5-磷化氢 (YFP2) 作为路易斯碱 (LB) 被引入。它与空间位阻的中等酸性路易斯酸 (LA) (4-Me-2,6-t Bu2-C 6H 2O)AlBu2 ((BHT)AlBu2) 结合,制备用于活性甲基丙烯酸酯聚合的受挫路易斯对 (FLP) 催化剂。这种聚合的鲜活特性已通过各种关键观察得到证实:成功的链延伸实验,对应于单体转化率和单体与引发剂比率的聚合物数均分子量 (Mn) 的线性增加,以及使用不同的共聚单体添加序列开发不同的二嵌段和三嵌段共聚物。重要的是,该 FLP 催化剂系统已成功合成 UHMW 聚甲基丙烯酸甲酯 (PMMA),在室温 (RT) 下 Mn 值高达 2935 kg/mol,分子量分布 (Đ) 窄。这一成就创造了使用活体/受控 LPP 系统的 PMMA 报告的最高 Mn 的新记录。
更新日期:2024-11-04
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