Preparation of homogeneous polyacrylamide hydrogels
2007-7-6 · The hydrogels were prepared in aqueous solu-tions at 21 C in the presence of 3.51 mM APSinitiator and 0.25 v/v% TEMED accelerator. Thecrosslinker ratio, that is the mole ratio of the cross-linker BAAm to the monomers AAm + DMA orAAm + NIPA was fixed at 1/83. The initial concen-tration of the monomers was also fixed at 5 w/v%.The composition of the comonomer mixturedenoted by the mole percent of DMA or NIPAwas varied over a wide range. The reactions werecarried out in glass tubes as well as in the light scat-tering vials. To illustrate the synthetic procedure inglass tubes, we give details for the preparation of aPAAm hydrogel with 20 mol% DMA: Stock solu-tions of AAm (1.45 ml), DMA (0.505 ml), BAAm
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