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One-pot synthesis for gradient copolymers via concurrent tandem living radical polymerization: mild and selective transesterification of methyl acrylate through Al(acac)(3) with common alcohols

A series of gradient copolymers were synthesized by the ruthenium-catalyzed living radical polymerization (LRP) of methyl acrylate (MA) and aliphatic alcohols using aluminum acetylacetonate Al(acac)(3). In this polymerization system, Al(acac)(3) was successfully used not only as an additive for the...

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Detalles Bibliográficos
Autores principales: Huynh, Tam Thi-Thanh, Kim, Si Eun, Kim, Soon Cheon, Kim, Jin Chul, Park, Young Il, Jeong, Ji-Eun, Yeo, Hyeonuk, Lee, Sang-Ho
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9037116/
https://www.ncbi.nlm.nih.gov/pubmed/35479477
http://dx.doi.org/10.1039/d1ra04595d
Descripción
Sumario:A series of gradient copolymers were synthesized by the ruthenium-catalyzed living radical polymerization (LRP) of methyl acrylate (MA) and aliphatic alcohols using aluminum acetylacetonate Al(acac)(3). In this polymerization system, Al(acac)(3) was successfully used not only as an additive for the Ru-catalyzed LRP but also as a catalyst for the selective transesterification of an unsaturated ester monomer in mild conditions in a process known as concurrent tandem living radical polymerization. The resulting MA-based gradient copolymers showed well-controlled molecular weight and distribution in a one-pot reaction and exhibited a well-controlled gradient sequence in their polymer chain. Control of transesterification and the metal-catalyzed living radical polymerization (Mt-LRP) rate varied depending on the concentration of the Al(acac)(3) and the structure of varying alcohols, which were confirmed by (1)H NMR, SEC, and DSC analysis. In particular, this research opens a new synthetic methodology for preparing acrylate-based gradient copolymers via concurrent tandem LRP not limited to the synthesis of methyl methacrylate types of gradient copolymers.