Kinetic modeling of the copolymerization of acrylic acid and trimethylolpropane triacrylate over pre and post-gelation periods

Controlled release of an optically active compound by hydrogels of acrylic acid and its online detection

“…Acrylic acid (AA, monomer, 99 %), trimethylolpropanetriacrylate (TMPTA, crosslinking agent, 70 %), and sodium persulphate (NPS, water‐soluble initiator, 98 %) were used as received from Sigma‐Aldrich. Despite the considerable level of impurities for TMPTA, detailed polymerization studies conducted with the same reagents did not provide unexpected results related to the chemical system …”

“…A mathematical dependence between the fed compositions and the hydrogel composition can be obtained by making use of a polymerization model. This kind of approach was already developed for the present system and can be found in Aguiar et al and Gonçalves et al…”

“…D‐fructose was used as the model optically active substance because it can be readily obtained, allows the use of a large range of concentrations in aqueous solution, and has a high specific rotation. The hydrogel of acrylic acid crosslinked with trimethylolpropane triacrylate (TMPTA) was chosen as the releasing matrix, since other studies with this hydrogel were already carried out earlier by the present group . The interactions between the hydrogel and D‐fructose solution and the resultant transport properties were evaluated.…”