0.2 g P(SPMA-co-tBMA) was added into a flask containing 25 mL DCM and 0.835 mL TFA, and the mixture was stirred at room temperature for 24 h [32]. The solvent was evaporated after hydrolysis, and the residue was then dissolved in THF and precip- itated in hexane. After filtration, amphiphilic P(SPMA-co-MAA) was dried under vacuum for 24 h.