Hydrogels from crosslinked hydroxyethylmethacrylate/N-vinylpyrrolidone (HEMA/NVP) copolymers —
Polimery 1996, No 6, 359
A method of mass polymerization initiated withbenzoyl peroxide (BPO) was used to prepare copolymers of 2-hydroxyethylmethacrylate (HEMA) and N-vinyl-2-pyrrolidone (NVP) crosslinked with butyleneglycol dimethacrylate (DMBD). Commercial-grade comonomers were used without purificationviz., 96.6% HEMA, 78.8% NVP, and 78.3% DMBD. Hydrogels of poly(HEMA-co-NVP)with various crosslinking degrees (0.7 to 3.75 mol % DMBD was used) wereobtained containing ca. 75 mol % NVP (series A), 50 mol % NVP (series B)and 35 mol % NVP (series D) with various crosslinking degrees (0.7 to 3.75 mol% DMBD were used). All samples were characterized in terms of hardness (Fp)in the solid state, equilibrium water (WRW) and ethanol (ERW) retention (Table1). The average chemical composition of the selected hydrogels was determinedby elemental analysis, bromometry and UV and IR spectrophotometry (Tables 2—4,Figures 1—3). Dynamic swelling studies were also carried out with water andethanol used as swelling media. The solvent transport mechanism was Fickian(Table 5). With the increase of mol fraction of more hydrophilic NVP from 35%to 50% in hydrogels, the water diffusion rate rose only slightly and thediffusion rate of ethanol was doubled.
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