研究了以SiO2 为载体负载茂金属rac -Et(Ind) 2 ZrCl2 时 ,SiO2 表面羟基的类型 ,MAO与SiO2 的作用方式 ;根据负载实验和MAO对茂金属的作用机理 ,提出了SiO2 负载茂金属催化剂的可能方式 .实验表明 ,SiO2 表面有 2种不同环境的羟基 ,茂金属通过与先负载到SiO2 表面的MAO间的作用负载到SiO2 上 ,属单分子层...
B, "Synthesis and characterization of copolymers of ethyl- ene and 1-octadecene using the rac-Et(Ind)2ZrCl2/MAO cata- lyst system", Macromol. Chem. Phy., 200, 1306 (1999)Raul Quijada,Ana Narvaez,Rene Rojas,Franco M. Rabagliati,Griselda Barrera Galland,Raquel Santos Mauler,Rosari...
Preparation and properties of propylene/POSS copolymer with rac-Et(Ind) 2 ZrCl 2 catalyst. Eur Polym J. 2009;45:40–6.Preparation and properties of ethylene/POSS copolymer with rac-Et(Ind) 2 ZrCl 2 catalyst. Zhang, H.X.,Jung, M.S.,Shin, Y.J.,Yoon, K.B.,Lee, D.-H. Journal...
研究了以SiO2 为载体负载茂金属rac -Et(Ind) 2 ZrCl2 时 ,SiO2 表面羟基的类型 ,MAO与SiO2 的作用方式 ;根据负载实验和MAO对茂金属的作用机理 ,提出了SiO2 负载茂金属催化剂的可能方式 .实验表明 ,SiO2 表面有 2种不同环境的羟基 ,茂金属通过与先负载到SiO2 表面的MAO间的作用负载到SiO2...
Polypropylene was synthesized using binary metallocene catalysts, rac-ethylenebis-(1-5-indenyl)-zirconium dichloride (rac-Et(Ind)ZrCl: Cata A) and zirconocene dichloride (CpZrCl: Cata B), in the presence of ZnEt. The results indicated that ZnEtwas an effective agent in modulating isotactivity ...
rac-Et[Ind]2ZrCl2/MAOmetallocene catalystCo-polymerization of ethylene and 1-hexene using rac -Et[Ind] 2 ZrCl 2 /MAO catalyst embedded in polystyrene in liquid slurry process was examined. The embedded catalyst was prepared by polymerizing a small amount of styrene. The specific activities and...
Preparation and properties of propylene/POSS copolymer with rac -Et(Ind) 2 ZrCl 2 catalyst[J] . He-xin Zhang,Young-jun Shin,Keun-byoung Yoon,Dong-ho Lee.European Polymer Journal . 2008 (1)Zhang H X,Shin Y J,Yoon K B,et al.Preparation andproperties of propylene/POSS copolymer w ith...
EthylenePolymerizationMAOTrimethylaluminum•Ethylene was polymerized byrac-Et(Ind)2ZrCl2/aluminoxane (MAO, dMAO or MMAO).•Concentration of active centers and its changes with time were determined.•Three kinds of active centers were differentiated by MWD deconvolution.•Free TMA was found to ...
Styrene was copolymerised with ethylene using the catalyst systems [rac-Et(H(4)Ind)(2)TiCl2]/MAO and [rac-Et(H(4)Ind)(2)ZrCl2]/MAO. Keeping other experimental variables under control, we tested different styrene/ethylene ratios in the reactor feed. It was found that the titanium-based...
The bathochromic shift of the metallocene absorption band of the system rac-Et(Ind)2ZrCl2/methylaluminoxane (MAO) in CH2Cl2 at 20°C proceeds in two distinct steps: for Al/Zr mole ratios in the range 20–50, a first bathochromic shift up to 440 nm is observed. It is explained by...