
Preparation, Characterization, and Evaluation 289
1800
2050
2300
2550
2800
3050
3300
3550
3800
012345678
Swelling Time (hr)
Swelling Degree (%)
0.03
FIGURE 3 The effect of variation in cross-linker concentration (MBA) on the percentage
of swelling degree (SD%). [Gelatin] 6%, [AM] 5%, and [APS] 0.05%/[FAS] 0.03%, at 35
o
C,
overnight, in case of (a) gelatin-g-PAM and (b) PAM hydrogels.
EFFECT OF INITIATOR CONCENTRATIONS (APS/FAS)
Table 4 shows the effect of variation of ammonium persulfate (APS) concentration in
the range of (0.025–0.1%) and ferrous ammonium sulfate concentration in the range
(0.015–0.06%) on the studied grafting parameters. ...