{
    "protocol": "The synthesis of POSS-PDMAEMA involves using POSS-Br as an ATRP macroinitiator. The mixture of POSS-Br (0.1024 g, 0.1 mmol), DMAEMA (1.8865 g, 12 mmol), HMTETA (0.0277 g, 0.12 mmol), and THF (2 ml) is injected into a 10 mL standard Schlenk flask. The flask is filled with highly pure nitrogen, and residual oxygen is removed by three freeze-pump-thaw cycles. CuBr (0.0144 g, 0.1 mmol) is added quickly to the flask, followed by another three freeze-pump-thaw cycles. The mixture is reacted at 50°C for 1.5, 2, and 2.5 hours, respectively, and the reaction is terminated by adding a few drops of THF into the flask. The solution is passed through a neutral alumina column to intercept Cu2+ and concentrated using a rotary evaporator. Finally, the resulting POSS-PDMAEMA polymers with different polymerization degrees are obtained by precipitating in cold n-hexane and drying in a vacuum oven for 24 hours."
}