Fm. Rabagliati et al., POLYMERIZATION OF STYRENE BY DIPHENYLZINC-ADDITIVE SYSTEMS - PART VI - PH2ZN-CP2TICL2-MAO SYSTEMS, Polymer bulletin, 39(6), 1997, pp. 693-699
The polymerization of styrene using combined systems of diphenylzinc-b
iscyclopentadienyltitanium dichloride-methylaluminoxane, Ph2Zn-Cp2TiCl
2-MAO, in toluene at 60 degrees C produced highly syndiotactic polysty
rene. The syndiotacticity was established first by polymer insolubilit
y in chloroform benzene or toluene, and also by continuous extraction
in boiling butanone. DSC analysis confirmed this finding and showed si
gnals corresponding to the melting temperature, T-m, of syndiotactic p
olystyrene.