The oxidative coupling reaction of 2,6-dimethylphenol with H202 catalyzed by a copper（H） Schiff complex in aqueous and Triton X-100 micellar solution under mild conditions was investigated. The kinetics of formation...The oxidative coupling reaction of 2,6-dimethylphenol with H202 catalyzed by a copper（H） Schiff complex in aqueous and Triton X-100 micellar solution under mild conditions was investigated. The kinetics of formation of 3,3＇,5,5＇-tetramethyl-4,4＇- diphenoquinone （DPQ） was studied. Rate constant k2 were obtained. The optimum pH for DPQ generation reaction is 7.25. The main product was DPQ in aqueous buffer solution, but PPE and the oxidized products of PPE remained in Triton X-100 micellar solution.展开更多
The effects of potassium ferricyanide,sodium n-dodecyl sulfate,sodium hydroxide and temperature on the molecular weight and the yield of poly(2,6-dimethyl-1,4-phenylene oxide)(PPO) synthesized in an aqueous medium wer...The effects of potassium ferricyanide,sodium n-dodecyl sulfate,sodium hydroxide and temperature on the molecular weight and the yield of poly(2,6-dimethyl-1,4-phenylene oxide)(PPO) synthesized in an aqueous medium were studied.It was found that oxygen in air had little influence on the oxidative polymerization of 2,6-dimethylphenol(DMP) in the aqueous medium,and potassium ferricyanide was only an oxidant during the oxidative polymerization of DMP.Sodium n-dodecyl sulfate could stabilize polymer particles an...展开更多
Lanthanide tris(2,6-dimethylphenolate)s [Ln(ODMP) 3] were used as initiators for ring-opening polymerization of ε-caprolactone (CL) for the first time. The influence of different rare earth elements and solvents was...Lanthanide tris(2,6-dimethylphenolate)s [Ln(ODMP) 3] were used as initiators for ring-opening polymerization of ε-caprolactone (CL) for the first time. The influence of different rare earth elements and solvents was investigated. 1H NMR spectral data of polycaprolactone (PCL) obtained showed that the polymerization mechanism is in agreement with the coordination-insertion mechanism and the selective cleavage of the acyl-oxygen bond of CL.展开更多
基金This work was supported by the National Natural Science Foundation of China(No.20107004)the Science Foundation of Department of Education of Zhejiang Province(No.20061609).
文摘The oxidative coupling reaction of 2,6-dimethylphenol with H202 catalyzed by a copper（H） Schiff complex in aqueous and Triton X-100 micellar solution under mild conditions was investigated. The kinetics of formation of 3,3＇,5,5＇-tetramethyl-4,4＇- diphenoquinone （DPQ） was studied. Rate constant k2 were obtained. The optimum pH for DPQ generation reaction is 7.25. The main product was DPQ in aqueous buffer solution, but PPE and the oxidized products of PPE remained in Triton X-100 micellar solution.
基金supported by the National Natural Science Foundation of China(No.20674075)Natural ScienceFoundation of Zhejiang Province(No.Y404299)Young Talents Project of Zhejiang Province(No.2008R40G2010065).
文摘The effects of potassium ferricyanide,sodium n-dodecyl sulfate,sodium hydroxide and temperature on the molecular weight and the yield of poly(2,6-dimethyl-1,4-phenylene oxide)(PPO) synthesized in an aqueous medium were studied.It was found that oxygen in air had little influence on the oxidative polymerization of 2,6-dimethylphenol(DMP) in the aqueous medium,and potassium ferricyanide was only an oxidant during the oxidative polymerization of DMP.Sodium n-dodecyl sulfate could stabilize polymer particles an...
文摘Lanthanide tris(2,6-dimethylphenolate)s [Ln(ODMP) 3] were used as initiators for ring-opening polymerization of ε-caprolactone (CL) for the first time. The influence of different rare earth elements and solvents was investigated. 1H NMR spectral data of polycaprolactone (PCL) obtained showed that the polymerization mechanism is in agreement with the coordination-insertion mechanism and the selective cleavage of the acyl-oxygen bond of CL.
