Solvent effects in radical copolymerization. IV. N‐methyl acrylamide

Abstract

The influence of different solvents on the copolymerization behaviour of N-methyl acrylamide with styrene and methyl methacrylate has been investigated. The calculated relative reactivities of N-methyl acrylamide towards both the polystyryl and poly(methy1 methacrylyl) radicals (l/rz) are practically unaffected by the reaction medium; on the contrary, the relative reactivities of both styrene and methyl methacrylate monomers towards the poly(N-methyl acrylamide) radical (l/rl) are remarkably influenced by the reaction solvents. A comparison both with unsubstituted and disubstituted acrylamides polymerized under the same conditions has been made. ZUSAMMENFASSUNG:Die Wirkung verschiedener Losungsmittel auf die Copolymerisation von N-Methylacrylsaureamid und Styrol bzw. Methylmethacrylat wurde untersucht. Die berechnete relative Reaktivitlt des N-Methylacrylsaureamids gegenuber Polystyrol-und Poly-(me-thylmethacryly1)-Radikalen (l/rz) wird durch das Losungsmittel praktisch nicht beeinflul3t.Umgekehrt beeinfldt das Losungsmittel aber die relative Reaktivitat der Styrol-und Methylmethacrylatmonomeren gegenuber dem Poly-(N-methylacry1saureamid)-Radikal-(l/rl). Wir haben die Copolymerisation der unter denselben Bedingungen polymerisierten unsubstituierten und disubstituierten Acrylsaureamide miteinander verglichen.

Influence of the Hydrophobe Structure on Composition, Microstructure, and Rheology in Associating Polyacrylamides Prepared by Micellar Copolymerization

“…Saini et al ,, studied the copolymerization of acrylamide, N -methylacrylamide (MeAM), and dimethylacrylamide (DMeAM) with styrene or methyl methacrylate. They carried out copolymerizations in a nonpolar solvent (dioxane, ε = 2.2) and in a polar solvent (ethanol, ε = 24.3).…”

Influence des interactions protiques sur les cinétiques de polymérisation du tris(hydroxyméthyl)acrylamidométhane (THAM) et de ses dérivés

“…La formation de liaisons hydroge `ne intermole ´culaires susceptibles de donner lieu a `la cre ´ation de dime `res et mieux d'agre ´gats a de ´ja `e ´te ´sugge ´re ´e pour expliquer la tre `s haute re ´activite ´des monome `res acrylamides en solution aqueuse. 20,21 Diffe ´rents auteurs [22][23][24][25] ont montre ´que la re ´activite ´des acrylamides primaires et secondaires posse ´dant des sites protiques (liaison amide), par l'interme ´diaire desquels peuvent s'e ´tablir des associations intermole ´culaires entre monome `res, e ´volue en fonction de la polarite ´du solvant. La re ´activite ´est d'autant plus importante que la constante die ´lectrique du solvant est faible, les associations e ´tant plus fortes dans un solvant apolaire que dans un solvant polaire.…”

Correlating Pyrene Excimer Formation with Polymer Chain Dynamics in Solution. Possibilities and Limitations

“…The reactivity ratios for styrene and p -chloromethylstyrene in benzene are 0.62 and 1.12, respectively . The reactivity ratios for styrene and N -methylacrylamide in dioxane are 2.10 and 0.64, respectively . The different reactivity ratios imply that some composition drift might occur during the copolymerization.…”

“…20 The reactivity ratios for styrene and N-methylacrylamide in dioxane are 2.10 and 0.64, respectively. 21 The different reactivity ratios imply that some composition drift might occur during the copolymerization. To minimize this eventuality, the copolymerizations were conducted up to a low conversion.…”