A new supported catalytic system of Cp Zr Cl2/ B F3/ Al2 O3 for ethylenepolymerization was prepared . The preparation conditions such as pretreatment temperature ,reaction time and the concentration of added B F3 w...A new supported catalytic system of Cp Zr Cl2/ B F3/ Al2 O3 for ethylenepolymerization was prepared . The preparation conditions such as pretreatment temperature ,reaction time and the concentration of added B F3 were investigated . It was found that thechemicalreaction and physical adsorption occurred between B Fand Al2 O3 . Their frequencywas dependent on the O Hconcentration at Al2 O3 surfaces. Ahigher polymerization activity106 ～107g P E/mol Zr·h was obtained by using the resultantsupported catalysteven atlower[ Al]/[ Zr] ratios.展开更多
Ferrocenediyldimethylsilane monomer has been synthesized.A series of poly(ferrocenyl dimethylsilanes) with different molecular weights have been prepared by thermal ring\|opening polymerization of 1,1′\|Ferrocenediyl...Ferrocenediyldimethylsilane monomer has been synthesized.A series of poly(ferrocenyl dimethylsilanes) with different molecular weights have been prepared by thermal ring\|opening polymerization of 1,1′\|Ferrocenediyldimethylsilane at different polymerization time. It was found that with increasing polymerization time from 5min to 60min the molecular weights of resultant poly(ferrocenyl dimethylsilanes) increase from M n=1 7×10 4 to M n=1 7×10 5. The reactions of ferrocene with tetracyanoethylene (TCNE) and the reactions of poly(ferrocenyl dimethylsilanes) with tetracyanoethylene (TCNE) were investigated by ESR. A signal with \%g\%≈2 was detected from resultant poly(ferrocenyl dimethylsilane)/TCNE system,which indicates the formation of poly(ferrocenyl dimethylsilane)/TCNE charge transfer complex.展开更多
文摘A new supported catalytic system of Cp Zr Cl2/ B F3/ Al2 O3 for ethylenepolymerization was prepared . The preparation conditions such as pretreatment temperature ,reaction time and the concentration of added B F3 were investigated . It was found that thechemicalreaction and physical adsorption occurred between B Fand Al2 O3 . Their frequencywas dependent on the O Hconcentration at Al2 O3 surfaces. Ahigher polymerization activity106 ～107g P E/mol Zr·h was obtained by using the resultantsupported catalysteven atlower[ Al]/[ Zr] ratios.
文摘Ferrocenediyldimethylsilane monomer has been synthesized.A series of poly(ferrocenyl dimethylsilanes) with different molecular weights have been prepared by thermal ring\|opening polymerization of 1,1′\|Ferrocenediyldimethylsilane at different polymerization time. It was found that with increasing polymerization time from 5min to 60min the molecular weights of resultant poly(ferrocenyl dimethylsilanes) increase from M n=1 7×10 4 to M n=1 7×10 5. The reactions of ferrocene with tetracyanoethylene (TCNE) and the reactions of poly(ferrocenyl dimethylsilanes) with tetracyanoethylene (TCNE) were investigated by ESR. A signal with \%g\%≈2 was detected from resultant poly(ferrocenyl dimethylsilane)/TCNE system,which indicates the formation of poly(ferrocenyl dimethylsilane)/TCNE charge transfer complex.
