Fast Ring‐Opening Polymerization of 1,2‐Disubstituted Epoxides Initiated by a CoIII‐Salen Complex,Macromolecular Chemistry and Physics

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Fast Ring‐Opening Polymerization of 1,2‐Disubstituted Epoxides Initiated by a CoIII‐Salen Complex
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2019-11-21 , DOI: 10.1002/macp.201900377
Ye Liu ₁ , Hui Ying Yu ₁ , Xiao Bing Lu ₁

Affiliation

Polyethers are an important class of polymers that find numerous applications. Ring‐opening polymerization of various 1,2‐disubstituted epoxides initiating a commercial, and well‐defined Co^III‐Salen complex is investigated in this paper. Remarkable reactivity (0.01% Co^III loadings, TOF up to 19200 h⁻¹) is discovered in this transformation. High molecular weight polymers (up to 80 kg mol⁻¹) are produced. In particular, polyether from ring‐opening polymerization of 1,4‐dihydronaphthalene oxide exhibits a glass transition temperatures (T_g) of up to 108 °C. By investigating the relationship between polymerization reactivity and counter ion in the Co^III complex, as well as the properties of the resultant polyethers, a cationic mechanism through an oxonium species is proposed.

中文翻译：

CoIII-Salen配合物引发的1,2-二取代环氧化物的快速开环聚合

聚醚是发现大量应用的重要一类聚合物。本文研究了各种1,2-二取代环氧化物的开环聚合反应，从而引发了商业化的，定义明确的Co ^III - Salen配合物。在该转化中发现了显着的反应性（0.01％Co ^III负载，TOF高达19200 h ^-1）。产生高分子量聚合物（至多80 kg mol ^-1）。尤其是，1,4-二氢萘氧化物的开环聚合反应所产生的聚醚的玻璃化转变温度（T _g）高达108°C。通过研究Co ^III中聚合反应性与抗衡离子之间的关系配合物以及所得聚醚的性质，提出了通过氧鎓物质的阳离子机理。

更新日期：2019-11-21

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