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INTRODUCTIONHeterodinuclearcomplexesareofgreatim portanceforthestudyofthesynergisticeffectsfoundinbimetalliccatalysis (Adams,1 988;Reddyetal.,1 989;Zhengetal.,1 989;Werneretal.,1 992 ) ,whichindicateddistinc tiveelectronic ,electrochemicalandmagneticpropertiesarisingfro… 相似文献
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THE POLYMERIZATION OF METHYL METHACRYLATE WITH A NEW TIN-BRIDGED YTTROCENE/Al(i-Bu)_3 总被引:1,自引:0,他引:1
INTRODUCTIONSincethepolymerizationofmethylmethacrylate(MMA)withrareearthcatalystswasrealizedforthefirsttimein1991,aseriesofnewrareearthcatalystsystemssuchasNd(P204)3/Al(iBu)3,Nd(P204)3/Al(iBu)3/CCl4,Nd(Oct)3/Al(iBu)3,Ln(acac)3/BuMgCl,Y(acac)3/Al(iBu)3/BuLi,Nd(naph)3/BuLi,andNd(O… 相似文献
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Novel homo-dinuclear silicon bridged cyanoethyl cyclopentadienyl complexes of titanium and zirconium (CH3)2Si((η5-C5H3CH2CH2CN)(C5H5)MCl2)2 (M=Ti(1), Zr(2)) were synthesized and developed for the polymerization of ethylene. Compared with their corresponding mononuclear complexes (η5-C5H4CH2CH2CN)(C5H5)MCl2 (M=Ti(3), Zr(4)), the dinuclear complexes had higher catalytic activity. And the polyethylene produced had a higher molecular weight than that obtained with mononuclear catalysts. Effects of conditions on the ethylene polymerization catalyzed by (2)/MAO (methylaluminoxane) were studied in detail. The catalyst showed a very high activity ( >106g PE/mol Zr*h) under low catalyst concentration and high molar ratio of Al/Zr. 相似文献
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POLYMERIZATION OF METHYL METHACRYLATE WITH IRON-YTTERBIUM DINUCLEAR METALLOCENE CATALYST 总被引:1,自引:0,他引:1
INTRODUCTIONHeterodinuclearcomplexesareofgreatinter estforthestudyofsynergisticeffectsfoundinbimetalliccatalysis(Dombek ,1 985;JnLingetal.,1 993 ;Mccollumetal.,1 996) .Moreandmoresyntheticrouteshavebeenreportedinthelastdecade(Harteretal.,1 989;Scottetal.,1 993 ;Diamondetal.… 相似文献
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