The atom transfer radical polymerization of styrene was carried out with an α-haloketone, 2-bromocyclohexanone, as the initiator in the presence of CuBr/Cu/2,2′-bipyridine or CuBr/ N,N,N′,N″,N″-pentamethyldiethyl...The atom transfer radical polymerization of styrene was carried out with an α-haloketone, 2-bromocyclohexanone, as the initiator in the presence of CuBr/Cu/2,2′-bipyridine or CuBr/ N,N,N′,N″,N″-pentamethyldiethylenetriamine catalytic system. The polymerization proceeded in a living fashion with that the number average molecular weight increased linearly with the increase of monomer conversion and the polydispersity was relatively low through the polymerization process, especially with CuBr/N,N,N′,N″,N″-pentamethyldiethylenetriamine as the catalyst. The initiation efficiency of 2-bromocyclohexanone in both catalysis systems was about 80%. 1H NMR and 13C NMR verified the presence of 2-oxocyclohexyl and bromine atom at the both ends of polystyrene chains respectively, which were derived from the 2-bromocyclohexanone.展开更多
Mercaptobenzothiozol self-assembled monolayer modified electrode was fabricated successfully,and cylic voltammetry and scanning electronic microscopy were used to characterize the SAMs modified electrode.The electroch...Mercaptobenzothiozol self-assembled monolayer modified electrode was fabricated successfully,and cylic voltammetry and scanning electronic microscopy were used to characterize the SAMs modified electrode.The electrochemical behaviors of emtol and P-benzenediol were studied on the SAMs in Britton-Robinson buffer solution.The results of the experiments indicate that metol and p-benzenediol can be catalyzed on the SAMs.They can not only be determined singleness but also be determined in mixture simultaneously and doesn’t interfere with each other in a large range of concentration.This method has been used to determine metol and P-benzenediol in waste photographic imaging agent with satisfactory results.展开更多
文摘The atom transfer radical polymerization of styrene was carried out with an α-haloketone, 2-bromocyclohexanone, as the initiator in the presence of CuBr/Cu/2,2′-bipyridine or CuBr/ N,N,N′,N″,N″-pentamethyldiethylenetriamine catalytic system. The polymerization proceeded in a living fashion with that the number average molecular weight increased linearly with the increase of monomer conversion and the polydispersity was relatively low through the polymerization process, especially with CuBr/N,N,N′,N″,N″-pentamethyldiethylenetriamine as the catalyst. The initiation efficiency of 2-bromocyclohexanone in both catalysis systems was about 80%. 1H NMR and 13C NMR verified the presence of 2-oxocyclohexyl and bromine atom at the both ends of polystyrene chains respectively, which were derived from the 2-bromocyclohexanone.
文摘Mercaptobenzothiozol self-assembled monolayer modified electrode was fabricated successfully,and cylic voltammetry and scanning electronic microscopy were used to characterize the SAMs modified electrode.The electrochemical behaviors of emtol and P-benzenediol were studied on the SAMs in Britton-Robinson buffer solution.The results of the experiments indicate that metol and p-benzenediol can be catalyzed on the SAMs.They can not only be determined singleness but also be determined in mixture simultaneously and doesn’t interfere with each other in a large range of concentration.This method has been used to determine metol and P-benzenediol in waste photographic imaging agent with satisfactory results.
