Add time:09/05/2019 Source:sciencedirect.com
13C NMR analysis of poly(4-methyl-1,3-pentadiene) (poly(4-MPD)) obtained by using the C2 symmetric zirconocene based catalytic system: rac-[CH2(3-tert-butyl-1-indenyl)2]ZrCl2 (1)/13C enriched methylaluminoxane (MAO) shows strong differences between the microstructure of the first inserted monomer unit and the in-chain inserted ones. The first insertion step results regiospecific, but not stereospecific, while the propagation step is regio- and stereoselective producing 1,2 syndiotactic poly(4-MPD). This feature is justified by assuming a “chain end” controlled mechanism working for the propagation step of polymerization. 13C NMR analysis of isotactic poly(4-methyl-1-pentene) (poly(4-MP)) obtained by using the same catalytic system shows that the first monomer insertion is partially enantioselective.
We also recommend Trading Suppliers and Manufacturers of 3-Methyl-1-pentene (cas 13643-02-2). Pls Click Website Link as below: cas 13643-02-2 suppliers
About|Contact|Cas|Product Name|Molecular|Country|Encyclopedia
Message|New Cas|MSDS|Service|Advertisement|CAS DataBase|Article Data|Manufacturers | Chemical Catalog
©2008 LookChem.com,License: ICP
NO.:Zhejiang16009103
complaints:service@lookchem.com Desktop View