*2.2. Preparation of RPMs*

The functional monomers 4-VP (2.4 mmol) and the EGMEA (0.48 mmol) and MBA (9.6 mmol) were dissolved in 100 mL of methanol in a 250 mL flask. Subsequently, 0.1260 g AIBN was added to the mixed solutions and the organic phase was formed by ultrasound. Then, the mixture was heated followed by mechanical agitation (50 rpm), and heat-polymerized at 70 ◦C for 11 h. The unreacted monomers were removed by methanol extraction for 48 h. The RPMs were dried under vacuo at 50 ◦C for 12 h.
