Dispersion polymerization of acrylamide with living character and controlled morphologies initiated and mediated by cobalt porphyrin

Abstract

Dispersion polymerization of acrylamide (AM) catalyzed by cobalt porphyrin [Cobalt tetramethoxyphenylporphyrin, (TMOP)Co(II)] with the feature of living radical polymerization (LRP) in alcohol/water or dimethylformamide (DMF)/water was described. Well-defined polyacrylamide (PAM) uniform spherical particles with predetermined molecular weight and narrow polydispersity (Mw/Mn = 1.09-1.35) were obtained under mild thermal conditions. Linear first-order kinetics with different feeding ratio of AM and cobalt porphyrin were obtained and the number-average molecular weight (Mn) increased linearly with monomer conversion. However, little research has been reported on the (TMOP)Co(II) mediating a living radical dispersion polymerization of acrylamide. The effects of feeding ratio of monomer and cobalt porphyrin, the solvent, the time of polymerization as well as monomer concentration on the morphology of the spherical particles were investigated. There were the increasing trends in the particle size with increasing the concentration of monomer, the time of polymerization and feeding ratio of AM and cobalt porphyrin. The effects of the volume ratio of alcohol or DMF and water were also studied.

Organocobalt Complexes as Sources of Carbon-Centered Radicals for Organic and Polymer Chemistries

“…Dispersion and emulsion polymerizations of acrylamide (AM) and tert -butyl acrylate (tBA) were recently carried out by using tetramethoxyphenylporphyrin, Co II (TMOP), and 2,20-azobis­[2-(2-imidazolin-2-yl)­propane] dihydrochloride (VA-044) in a bimolecular pathway (Table , entries 5 and 6). , DMF and ethanol were used in combination with water as the reaction medium, and well-defined PAM and PtBA spherical particles were produced under mild conditions.…”

Dispersion and soap-free emulsion polymerization of tert-butyl acrylate with the living character and controlled particle size mediated by cobalt porphyrin

“…Recently, we reported the dispersion polymerization of acrylamide (AM) mediated by (TMOP)Co(II). 26 The synthesized poly (AM) had narrow polydispersity values (M w /M n ¼ 1.09-1.35) and the corresponding molecular weight (M n ) linearly increased with the monomer conversion. However, the conversion was relatively low ($40%).…”