Resumo

RABAGLIATI, FRANCO M. et al. POLYMERIZATION OF STYRENE BY DIPHENYLZINC-ADDITIVE SYSTEMS. PART X. HOMO- AND COPOLYMERIZATION OF STYRENE USING Ph₂Zn - METALLOCENE - MAO SYSTEMS. Bol. Soc. Chil. Quím. [online]. 2000, vol.45, n.2, pp.219-226. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16442000000200008.

Combination of diphenylzinc, Ph2Zn, cyclopentadienyl titanium trichloride, CpTiCl₃, and methylaluminoxane, MAO, were used to initiate styrene, S, polymerization and its copolymerization with 1-hexadecene, 1-C₁₆H₃₂, and with p-tert-butylstyrene, p-Bu^tS. For homopolymerization an almost pure syndiotatic polystyrene, s-PS, was obtained when using Ph₂Zn-CpTiCl₃-MAO combination, while other combinations of these components produced atactic polystyrene, a-PS, or almost no polymer at all. CpTiCl₃-MAO and Ph₂Zn-CpTiCl₃-MAO were effective initiator systems for S/1-C₁₆H₃₂ and for S/p-Bu^tS copolymerization. S/1-C₁₆H₃₂ copolymers showed crystalline melting temperature at range 235 - 255 °C while S/p-Bu^tS copolymers did not show any melting temperature signal at DSC, but behave as stereoregular polymer

Palavras-chave : styrene; polymerization; copolymerization; diphenylzinc; metallocenes; catalysts; stereoregularity; tacticity.