Investigation Of The Preparation Of Ultra High Molecular Weight Poly-α-Alkene By Z-N/Metallocene Catalyst

In this paper, the development and application on polyolefin and the details of the alpha olefins in drag reduction applications, and the development and application of the catalys on the synthesise of polymer drag reduction were detailed. With comparison between the mechanism of these two kinds of catalysts of metallocene catalyst and Natta Ziegler (Z-N) of catalyst and details on the effects of polymer molecular weight polymer molecular weight, summarized the several influential factors. The polymers: synthesis method and the testing methods, polymer gel chromatography high standard curve and the processing of unknown samples were detailed.In this paper we use Cp₂ZrCl₂, Cp₂TiCl₂ Ziegler- Natta as catalyst, (C₂H₅)₃Al as cocatalyst. Ultra high molecular weighα-alkene-derivatived polymers were synthesized by bulk polymerization with the combination of Ziegler-Natta (Z-N), Metallocene (Cp₂ZrCl_2/ Cp₂TiCl₂) as the primarily catalyst and the aluminium triethyl [(C₂H₅)₃Al] as the cocatalyst. The optimum catalysts' composition ratio was obtained by the orthogonal experiment method. Gel permeation chromatograph (GPC) test shows that the resulted polymers achieved the weight-average molecular weights of 1.12×10⁷ and with the polydispersity of 3.79 when employing this optimum catalysts' composition ratio. The apparent viscosity of the polymer in hexane reached 27 mPa·s as measured by the revolving viscosity apparatus, when use the combination of Z-N(0.02g) and Metallocene (Cp₂ZrCl₂:0.03) as the primarily catalyst and the aluminium triethyl (C₂H₅)₃Al(0.15ml) as the cocatalyst. Gel permeation chromatograph (GPC) test shows that the resulted polymers achieved the weight-average molecular weights of 4716253 and with the polydispersity of 3.871383. when employing this optimum catalysts' composition ratio. The apparent viscosity of the polymer in hexane reached 20 mPa·s as measured by the revolving viscosity apparatus, when use the combination of Z-N(0.02) and Metallocene (Cp₂TiCl₂:0.03 ) as the primarily catalyst and the aluminium triethyl (C₂H₅)₃Al(0.8ml) as the cocatalyst. NMR, FT-IR, XRD test of polymer were used. For further verified the target polymer.In the last of paper, the effects between different catalytic conditions of the polymer molecular weight and physical contrast to the molecular weight of polymer blends and molecular weight distribution were discussed. The article gives the better catalyst systemon systhesize of the ultra-high molecular weight polymer with wide molecular weight distribution.