Polymerization kinetics of polyacrylamide gels I. Effect of different cross‐linkers

摘要: Polymerization kinetics of polyacrylamide gels, cross-linked with the following: N,N′-methylenebisacrylamide (Bis), N,N′-bisacrylylcystamine (BAC), N,N′- diallyltartardiamide (DATD), N,N′(1,2-dihydroxyethylene) bisacrylamide (DHEBA) and ethylene diacrylate (EDA), have been studied. The gels are polymerized directly in a spectrophotometer quartz cuvette followed at 283 nm (disappearance double bond) or 600 (Tyndall effect due to turbidity Bis, DHEBA BAC gels). order reactivity various cross-links appears be: Bis ≅ > EDA ≫ DATD. last cross-link, was found actually be an inhibitor gel polymerization, leading highly unpolymerized especially high %C values. 3 5 levels, fully within 30 min room temperature, while same range, require least 3h. All cross-links, when used above 10 %C, display quite slow polymerization kinetics, requiring overnight reaction for good conversion monomers into polymer chains. When polymerizing liquid linear (without cross-link), initial concentration 5% should continued overnight, temperature higher, acceptable efficiency. On basis these data, new structural model is proposed.