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vol.45 número2CATALYTIC COMBUSTION OF TOLUENE ON Pd-Cu/SiO2 CATALYSTSHEXAMETHYLBENZENERUTHENIUM(II) COMPLEXES CONTAINING BIS(DIPHENYLPHOSPHINE)AMINE AND THEIR SULPHUR OR SELENIUM DERIVATIVES AS LIGANDS índice de autoresíndice de assuntospesquisa de artigos
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Boletín de la Sociedad Chilena de Química

versão impressa ISSN 0366-1644

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-ButS. 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-ButS copolymerization. S/1-C16H32 copolymers showed crystalline melting temperature at range 235 - 255 °C while S/p-ButS 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.

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