Efficient Introduction of Aromatic Vinyl Group by Incorporation of Divinylbiphenyl, p-Divinylbenzene in Syndiospecific Styrene Polymerization Using Aryloxo-Modified Half-Titanocene Catalysts

摘要

An efficient introduction of aromatic vinyl group into syndiotactic polystyrene has been achieved by incorporation of 3,3'-divinylbiphenyl, p-divinylbenzene (DVB) in syndiospecific styrene polymerization using aryloxo-modified half-titanocenes, Cp'TiCl2(O-2,6-(Pr2C6H3)-Pr-i) (Cp' = (BuC5H4)-Bu-t, 1,2,4-Me3C5H2), in the presence of MAO. The resultant polymers possessed high molecular weights with uniform molecular weight distributions, and the DVB contents could be varied by the initial feed molar ratios (6-23 mol %) without decrease in the Mn values. The syndiotactic stereo-regularity and presence of the vinyl groups were confirmed by NMR spectra. (C) 2016 Wiley Periodicals, Inc.