Living radical polymerization of acrylates and acrylamides mediated by a versatile cobalt porphyrin complex

Abstract

Living radical polymerization (LRP) of organic and water soluble acrylates and acrylamides was mediated by a versatile cobalt porphyrin complex (TMP-OH)Co. The capability of this cobalt complex to mediate LRP in both polar and non-polar media permits the direct synthesis of useful and previously difficult to prepare functional block copolymers.

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

“…These results demonstrated the living character and control-ability of (TMOP)Co(II) in dispersion polymerization of AM [7] . [11][12]37] On the other hand, the conversion was relatively low since the polymer had already started to coagulate after the conversion reached ~ 40% in DMF/water and the reaction had to been terminated. On the one hand, there was a significant discrepancy between experimental and theoretical molecular weight of the PAM (Table 1, entry 2-8.…”

“…[7] When vinyl acetate as monomer, (TMP)Co(II) was also an efficient mediator in living radical polymerization. [11][12] Polyacrylamide (PAM) was widely used in many fields owing to a good precipitation property, for example, as flocculants for wastewater treatment, [13][14][15][16] retention aids in papermaking, [17][18][19] etc. Poly-(acrylic acid) with a high molecular weight (232 000) and narrow molecular weight distribution (PDI = 1.20) was rapidly obtained by AA polymerization in the presence of (TMPS)Co(II) and an azo-initiator (V-70).…”

“…[10] Cobalt porphyrin substituted by three mesityl groups and one phenyl group with a long chain alcohol at the para position was designed to increase the solubility in different solvents. [11][12] Specifically, so far, little research had been reported on the LRP of acrylamide in dispersion system via OMRP. [11][12] Polyacrylamide (PAM) was widely used in many fields owing to a good precipitation property, for example, as flocculants for wastewater treatment, [13][14][15][16] retention aids in papermaking, [17][18][19] etc.…”

Well-controlled atom transfer radical polymerizations of acrylates using recyclable niobium complex nanoparticle as photocatalyst under visible light irradiation

“…Photoinitiated polymerizations have significant advantages in medical applications and photo-specific reactions. The photoinitiated LCRPs have been applied in NMRP [17,18], ATRP [19][20][21], cobalt-mediated radical polymerization [22][23][24], organotellurium-mediated radical polymerization [25] and RAFT [26,27]. Among them, photoinitiated ATRP has been studied extensively because of the broad range of monomers and mild polymerization conditions.…”

Versatile cobalt complexes for initiating immortal ring‐opening polymerization (ROP) of lactide (LA), mediating living radical polymerization of t‐butyl acrylate (tBA) and catalyzing copolymerization of LA and tBA by combination of ROP and organometallic‐mediated radical polymerization

“…Recently reported is an alternative transition metal‐mediated living radical polymerization (LRP) method, namely organometallic‐mediated radical polymerization (OMRP), which is based on temporary and reversible deactivation of growing radicals by metallic species acting as persistent radicals . Recently, Fu and co‐workers reported the LRP of acrylates mediated by cobalt salen/porphyrin complexes . A few examples of successful copolymerization of LA and acrylates by combining ROP and ATRP (or RAFT) have been reported .…”