3.2.6. Cross-Linker (NMBA)

Figure 1f demonstrates the effect of NMBA concentration (5.8 <sup>×</sup> <sup>10</sup><sup>−</sup>1–29.4 <sup>×</sup> <sup>10</sup>−<sup>1</sup> mol L<sup>−</sup>1) on the swelling percentage of GT-cl-poly(DMA) hydrogel. The recorded highest swelling percentage was 957.2% at NMBA concentration of 5.8 <sup>×</sup> <sup>10</sup>−<sup>1</sup> mol L<sup>−</sup>1. Beyond 5.8 <sup>×</sup> <sup>10</sup>−<sup>1</sup> mol L<sup>−</sup>1, the excess network was developed due to the more cross-linking points. Thus, the excess network led to decrease the available pores and swelling percentage of GT-cl-poly(DMA) hydrogel.
