2-Methoxyethylamino-bis(phenolate)yttrium Catalysts for the Synthesis of Highly Isotactic Poly(2-vinylpyridine) by Rare-Earth Metal-Mediated Group Transfer Polymerization,Macromolecules

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2-Methoxyethylamino-bis(phenolate)yttrium Catalysts for the Synthesis of Highly Isotactic Poly(2-vinylpyridine) by Rare-Earth Metal-Mediated Group Transfer Polymerization
Macromolecules ( IF 5.1 ) Pub Date : 2016-08-29 00:00:00 , DOI: 10.1021/acs.macromol.6b01179
Alexander Kronast ₁ , Dominik Reiter ₁ , Peter T. Altenbuchner ₁ , Sergei I. Vagin ₁ , Bernhard Rieger ₁

Affiliation

Highly isotactic poly(2-vinylpyridine) (P2VP) was synthesized by the group transfer polymerization of the prochiral 2-vinylpyridine (2VP) with 2-methoxyethylaminobis(phenolate)yttrium complexes. Isotacticities of up to P_m = 0.92, narrow molecular weight distributions, and high molecular weights were achieved by steric modifications of the variable bisphenolate ligand structure. The resulting polymer samples were characterized by thermoanalysis (DSC, TGA), GPC, and ¹³C NMR. The origin of the isotactic microstructure was attributed to an enantiomorphic site control mechanism based on ¹³C NMR mechanistic studies and allowed new insights into ¹³C pentad assignments.

中文翻译：

稀土金属介导的基团转移聚合合成2-全甲氧基乙氨基双（酚盐）钇催化剂

通过将前手性2-乙烯基吡啶（2VP）与2-甲氧基乙基氨基双（酚盐）钇配合物进行基团转移聚合，合成了高度全同立构的聚（2-乙烯基吡啶）（P2VP）。通过可变双酚盐配体结构的空间修饰，可实现等规度高达P _m = 0.92，窄分子量分布和高分子量。通过热分析（DSC，TGA），GPC和¹³ C NMR对所得的聚合物样品进行表征。等规微观结构的起源归因于基于¹³ C NMR机理研究的对映体位点控制机制，并为¹³ C五单元组的分配提供了新的见解。

更新日期：2016-08-29

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