{
    "protocol": "Synthesis of POSS-PDMAEMA. POSS-PDMAEMA was synthesized by 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) was injected into the 10 mL standard Schlenk flask. Highly pure nitrogen was filled the flask and then oxygen was removed by three freeze-pump-thaw cycles. Subsequently, CuBr (0.0144 g, 0.1 mmol) was added quickly to the flask. Three freeze-pump-thaw cycles were carried out again to remove residual oxygen. The mixture was reacted at 50°C for 1.5, 2 and 2.5 h, respectively, and terminated by dropping a few THF droplets into the flask. The solution was passed through a neutral alumina column to intercept Cu^{2+} and concentrated in a rotary evaporator. Finally, POSS-PDMAEMA polymers with three different polymerization degrees, i.e., POSS-PDMAEMA 50, POSS-PDMAEMA 70, and POSS-PDMAEMA 90, were obtained by precipitating into cold n-hexane and followed by drying in a vacuum oven for 24 h."
}