-“Crosslinking reactions and swelling behavior of matrices based on N-acryloyl-TRIS (hydroxymethyl)aminomethane”.

CECILIA I. ALVAREZ I.; DARIO ARRUA

POLYMER BULLETIN

Springer Verlag

Lugar: Heidelberg (Alemania); Año: 2005 vol. 55 p. 19 - 29

0170-0839

Summary-- In this study, new hydrogels in rod shape were prepared from N-acryloyl- TRIS(hydroxymethyl)aminomethane (NAT) using ethylene glycol dimethacrylate (EGDMA) or N,N´methylenebisacrylamide (BIS) as crosslinking agent, dimethylformamide (DMF) as solvent and benzoyl peroxide (BPO) as initiator. In  most cases, 2-hydroxyethyl methacrylate (HEMA), acrylamide (Aam) or acrylic acid (Aac) were used as co-monomers. The polymeric matrices obtained by free radical  polymerization exhibited different properties by changing crosslinker, crosslinker  concentration, co-monomer and initial NAT/co-monomer mole ratio. Besides,  hydrogels from HEMA, Aam and Aac with BIS in absence of NAT were prepared  under the same experimental reaction conditions in order to compare the properties of  these products with those synthesized from NAT and the respective co-monomers. Some of the final products were selected to perform urea release assays, conducted  through swelling-controlled release. Urea was chosen as "model" plant fertilizer agent.