Penicillamine–cerium(IV) initiator system for synthesis of hydrogel containing lithium methacrylate ionic groups

Abstract

In this study, the synthesis of hydrogels of acrylamide or acrylamide and lithium methacrylate in the presence of N,N′‐methylene bis(acrylamide) as crosslinker by using penicillamine–cerium(IV) sulfate redox initiator system was studied. The effects of the amounts of lithium methacrylate at constant crosslinker concentration and the mole ratios of total monomer/crosslinker on the swelling behaviors of hydrogels in distilled water were investigated. The hydrogels containing various ionic groups, such as, LiMA, NaMA, and KMA which were used in the copolymerization reaction at constant molar ratio of ionic monomer/acrylamide = 0.67 at different ratios of nM/nMBAAm = 25, 50, 200, and 400 (nM = nIM + nAAm), were synthesized. The swelling ratios and equilibrium swelling values were compared for the hydrogels. The swelling behaviors of hydrogels were also examined in the salt and phosphate buffer solutions.

Synthesis and polymeric modification of hydroxyapatite from biogenic raw material for adsorptive removal of Co2+ and Sr2+

“…Modification of hydroxyapatite also has become a popular process to obtain certain properties and materials such as alginate [16], polymers [17], clay [18] were typical materials used for modification of hydroxyapatite. In recent years, the adsorbents of copolymer or polymer composites functionalized with amideoximes and phosphoric, acrylic, acrylamide, methacrylic have been used to control adsorption capacity and to provide selective adsorption of toxic or radioactive metal ions from aqueous or waste solutions [19][20][21][22][23].…”

Redox two-component initiated free radical and cationic polymerizations: Concepts, reactions and applications

“…Instead of weak bonds oxidizing agents, Ce(IV) (ammonium, sulfates and/or nitrates) can be reduced to Ce(III) with many reducing agents such as alcohols [114,115], aldehydes, acids, amines [116], and more generally chelating agents in order to form free radicals [7,8,[117][118][119]. Most of the mechanisms reported in the literature propose first the formation of an intermediate Ce(IV) complex from Ce(IV) that can be subsequently dissociated into three species, leading to a radical formation on the chelated adduct and the removal of a labile hydrogen and the formation of Ce(III).…”