Ring-Opening Polymerization of Lactones Catalyzed by Silicon-Based Lewis Acid

IF 3.4 4区 化学 Q2 POLYMER SCIENCE
Y. Nakayama, Keiya Katagi, R. Tanaka, T. Shiono
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引用次数: 0

Abstract

Many catalysts containing various elements at their active sites have been reported for the ring-opening polymerization (ROP) of cyclic esters. However, to our knowledge, silicon-based catalysts for ROP have never been reported. Here we report the ROP of cyclic esters and cyclic carbonates catalyzed by the derivatives of bis(perchlorocatecholato)silane (Si(catCl)2), which is a neutral silicon-based Lewis acid recently reported by Greb et al. The catalyst systems show high activity for the ROP of seven- and six-membered ring monomers such as ε-caprolactone, δ-valerolactone, and trimethylene carbonate to produce the polymers with molecular weights up to 32 kg/mol. The matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and nuclear magnetic resonance analysis of the obtained polymers indicates the predominant formation of cyclic polymers.
硅基路易斯酸催化内酯开环聚合的研究
许多在活性位点含有各种元素的催化剂已被报道用于环状酯的开环聚合(ROP)。然而,据我们所知,用于ROP的硅基催化剂从未被报道过。在这里,我们报道了由双(高氯酸盐)硅烷(Si(catCl)2)的衍生物催化的环状酯和环状碳酸酯的ROP,这是Greb等人最近报道的一种中性硅基路易斯酸。催化剂体系对七元和六元环单体如ε-己内酯、δ-戊内酯、,和碳酸三亚甲基酯,以生产分子量高达32的聚合物 千克/摩尔。所获得的聚合物的基质辅助激光解吸/电离飞行时间质谱(MALDI-TOF MS)和核磁共振分析表明主要形成环状聚合物。
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来源期刊
CiteScore
6.10
自引率
0.00%
发文量
55
审稿时长
>12 weeks
期刊介绍: The International Journal of Polymer Science is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles on the chemistry and physics of macromolecules.
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