Visible-Light-Induced Living/Controlled Radical Copolymerization of 1-Octene and Acrylic Monomers Mediated by Organocobalt Complexes
Journal
Macromolecules
Journal Volume
53
Journal Issue
1
Pages
212-222
Date Issued
2020
Author(s)
Abstract
Compared with homopolymers, the copolymers exhibit improved properties, providing a broad application prospect. Herein, we report the visible-light-induced living/controlled radical copolymerization of acrylates or acrylamides and 1-octene mediated by organocobalt complexes at ambient temperature, giving copolymers with well-predictable molecular weights from 4400 to 27200 and low polydispersities in the range 1.17-1.28. The acrylic monomer reactivity ratio was calculated by monomer conversion and molar fraction of 1-octene without a complex fitting process. The electron-withdrawing groups on acrylic monomers resulted in low reactivity ratio down to 1.1 along with high molar fraction of 1-octene up to 34%, while electron-donating group led to increased reactivity ratio as 43 with a declined molar fraction of 1-octene as 3%. For the first time, a linear relationship between the logarithm of the reactivity ratio and the atomic charge of the propagating radical was observed, which affords a potential quantitative model to evaluate the electronic effect in other copolymerization systems. Copyright ? 2019 American Chemical Society.
Other Subjects
Copolymerization;Light;Molar ratio;Electron withdrawing group;Electron-donating group;Monomer reactivity ratios;Organocobalt complexes;Predictable molecular weight;Quantitative modeling;Radical copolymerization;Visible light induced;Acrylic monomers
Type
journal article