Synthesis Of Salicylideneiminato Catalysts And Its Catalytic Performance On Olefin Polymerization

In this thesis, six salicylideneiminato double metal complexes with different substituted groups (Cat1-Cat6) were prepared and their catalytic performance to ethylene, norbornene, and methyl methacrylate polymerization were investigated. The results were summarized as follows:1. 5,5'-methyl-bis-t-butyl hydroxybenzaldehyde 2-isopropyl aniline zirconium complexes(Cat1), 5,5'-methyl-bis-t-butyl hydroxybenzaldehyde 2,6-diisopropylamine zirconium complexes(Cat2), 5,5'-methyl-bis-t-butyl hydroxybenzaldehyde 2-fluoro aniline zirconium complexes(Cat3), 5,5'-methyl-bis-hydroxybenzaldehyde 2-isopropyl aniline nickel complexes (Cat4), 5,5'-methyl-bis-hydroxybenzaldehyde 2,6-diisopropylamine nickel complexes (Cat5), and 5,5'-methyl-bis-hydroxybenzaldehyde 2-fluoro aniline nickel complexes (Cat6) were succesfully synthesized and characterizate by IR, ~1H NMR and UV.2. The ethylene polymerization was carried out under Cat1-Cat3 catalyst system. The results indicated that the catalyst with giving electronic isopropyl groups substituents (Cat1) had highest catalytic activity among the catalyst investigated, reached 3.6×10~5g/molZr.h. The effects of reaction conditions on the polymerization were systematically investigated, such as main catalyst, reaction time, temperature, molar ratio of catalysts to cocatalysts, and different cocatalysts. The wide molecular weight distribution (Mw/Mn)polymers around 32.5-37.6 were obtained under lower polymerization temperature (0℃-40℃) for Cat1, while Mw/Mn of polymers obtained is between 1.00 and 1.30 under higher polymerization temperature (60℃-80℃) by GPC. Furthermore, It proofed a certain degree of branched polyethylene was gotten, characterizate by IR, ~1C NMR and DSC.3. The polymerization of norbornene was catalyzed by Cat4-Cat6. The catalytic activity of Cat4 is up to 1.16×10~6gPNB/molNi.h. The resulted polynorbornenes were characterized by IR, 1H NMR in detail, indicating that norbornene polymerization via addition polymerization route. The temperature play a silm role in molecular weight distribution of resulted polynorbronene.4. The polymerization of methyl methacrylate was performed under Cat4-Cat6 catalyst system. The catalytic activity of Cat4 reached 1.42×10~5 g PMMA/molNi.h. Poly(methyl methacrylate) with 73% regularity degrees was obtained, whose glass transition temperature is about 108℃.