c$)$ Below is an example of a hydrogel that has responsive behaviour from Hibbins et al$.$ Polymers $2017,9(10),474.$ The photo shows the bulk morphology of the polymer. For this material explain the following:

i$.$ How the chemical structure of the polymer controls its properties?ur

ii$.$ What type of stimulus would lead to responsive behaviour and why?

iii. What monomers would you use to make this polymer?