Macromolecular initiator was prepared from the reaction between 2-Bromoisobutyryl bromide (Br-iBuBr) and CNC with the catalysis of triethylamine. About 26 mL of Br-iBuBr was added into the mixture containing CNC, triethylamine and DMF, and the mixture was kept stirring at 70 ◦C for 24 h under the protection of a
nitrogen. The reacted mixture was filtered through a Buchner funnel and the crude product was received. Finally, the crude product was purified by way of Soxhlet extractions with dichloromethane (24 h) and ethanol (24 h), and the esterified CNC, namely macroinitiator was prepared. About 50 mL of anisole, 50 mL of styrene and 0.7 mL of 2- bromoisobutyrate were introduced into the mixture of copper(I) bromide loaded in three-neck flask. Followed by adding appropriate PMDETA. The reaction was performed at 100 ◦C for 12 h under nitrogen atmosphere. The grafted NCCs were obtained by filtration through a Buchner funnel and purified by Soxhlet extractions with dichloromethane (24 h) and ethanol (24 h). The remaining polystyrene homopolymer was removed by washing against methanol by centrifugation.
Macromolecular initiator was prepared from the reaction between 2-Bromoisobutyryl bromide (Br-iBuBr) and CNC with the catalysis of triethylamine. About 26 mL of Br-iBuBr was added into the mixture containing CNC, triethylamine and DMF, and the mixture was kept stirring at 70 ◦C for 24 h under the protection of anitrogen. The reacted mixture was filtered through a Buchner funnel and the crude product was received. Finally, the crude product was purified by way of Soxhlet extractions with dichloromethane (24 h) and ethanol (24 h), and the esterified CNC, namely macroinitiator was prepared. About 50 mL of anisole, 50 mL of styrene and 0.7 mL of 2- bromoisobutyrate were introduced into the mixture of copper(I) bromide loaded in three-neck flask. Followed by adding appropriate PMDETA. The reaction was performed at 100 ◦C for 12 h under nitrogen atmosphere. The grafted NCCs were obtained by filtration through a Buchner funnel and purified by Soxhlet extractions with dichloromethane (24 h) and ethanol (24 h). The remaining polystyrene homopolymer was removed by washing against methanol by centrifugation.
การแปล กรุณารอสักครู่..
