3.2.4. Microwave Power

The swelling percentage was maximum at 20% of microwave power for GT-cl-poly(DMA) hydrogel (Figure 1d). The swelling percentage was lower at microwave power above 20%. This was due to the formation of excess radical led to increase the homo-polymerization rate reaction. Hence, the microwave power was kept at 20% for further synthesis reaction of GT-cl-poly(DMA) hydrogel.

## 3.2.5. Monomer (DMA) Concentration

The swelling percentage was affected by concentration of monomer (DMA) used in the development of GT-cl-poly(DMA) hydrogel. The maximum swelling percentage was observed at 4.4 <sup>×</sup> 10−<sup>1</sup> mol L−<sup>1</sup> of DMA concentration (Figure 1e). The increase in the concentration of DMA monomer from 4.4 <sup>×</sup> <sup>10</sup>−<sup>1</sup> mol L−<sup>1</sup> to 22.05 <sup>×</sup> <sup>10</sup>−<sup>1</sup> mol L−<sup>1</sup> led to decrease the swelling percentage due to the self cross-linking of DMA.
