HYDROGELS FROM N,N'-DIMETHYLACRYLAMIDE-co-2-ACRYLAMIDO-2-METHYL-1-PROPANESULFONIC ACID WITH SALT-, TEMPERATURE- AND pH-RESPONSIVENESS PROPERTIES

Pooley, SA; Rivas BL; Carcamo, AL; Pizarro GDC

Abstract

"The synthesis of copolymer hydrogels of JV, W-dimethylacrylamide (NNDMAAm) with 2-acrylamido-2-methyl- 1-propanesulfonic acid (AMPS) were prepared by solution free radical polymerization at different feed mole ratios (mole ratios of nNNDMAAm/nAMps = 0.5/0.5; 0.33/0.66; 0.66/0.33; 0.25/0.75; 0.75/0.25). In this reaction ammonium persulfate (APS) and N,N'-methylene-bis-acrylamide (MBA) were used as initiator and cross-linking reagents respectively. These copolymers were insoluble in water and it were characterized by elemental analysis, FT-IR spectroscopy, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). Aqueous solutions of the copolymers showed lower critical solution temperature behavior (LCST). The phase transition temperatures of aqueous solutions of these copolymers increased with increasing of hydrophilic AMPS comonomer content in the copolymers. The effects of reaction parameters, including the concentration of cross-linking reagent, the monomer concentration, pH, temperature, salt solutions, and solvent polarity on the water absorption have been also studied. Under the experimental conditions, the copolymer poly(NNDMAAm-co-AMPS) with a feed mol ratio 1:2 presents the best swelling properties. The monomer reactivity ratios for poly(NNDMAAm-co-AMPS) are the following: r1 = 0.217 and r2 = 2.20, (r1 x r2 = 0.48)."

Más información

Título según WOS: Hydrogels from N,N '-dimethylacrylamide-co-2-acrylamido-2-methyl-1-propanesulfonic acid with salt-, temperature- and pH-responsiveness properties
Título según SCIELO: HYDROGELS FROM N,N'-DIMETHYLACRYLAMIDE-co-2-ACRYLAMIDO-2-METHYL-1-PROPANESULFONIC ACID WITH SALT-, TEMPERATURE- AND pH-RESPONSIVENESS PROPERTIES
Título de la Revista: Journal of the Chilean Chemical Society
Volumen: 53
Número: 2
Editorial: SOC CHILENA QUIMICA
Fecha de publicación: 2008
Página de inicio: 1483
Página final: 1489
Idioma: English
DOI:

10.4067/S0717-97072008000200008

Notas: ISI, SCIELO