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Boletín de la Sociedad Chilena de Química

versão impressa ISSN 0366-1644

Resumo

RABAGLIATI, FRANCO M.; CARO, CARLOS J.  e  PEREZ, MONICA A.. COPOLYMERIZATION OF STYRENE BY DIPHENYLZINC-ADDITIVE SYSTEMS: PART III. COPOLYMERIZATION OF STYRENE/para- METHYLSTYRENE USING CpTiCl3-MAO and Ph2Zn-CpTiCl3-MAO INITIATOR SYSTEMS. Bol. Soc. Chil. Quím. [online]. 2002, vol.47, n.2, pp.137-144. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16442002000200009.

The copolymerization of styrene with p-methylstyrene has been tested using combined diphenylzinc-additive initiator systems, including diphenylzinc, Ph2Zn, a metallocene: cyclopentadienyltitanium trichloride, CpTiCl3, and methylalumoxane, MAO, as well as the binary CpTiCl3-MAO initiator system. Both combined initiator systems were able to induce S/p-MeS copolymerization and the corresponding homopolymerizations. Conversion to copolymer increases with an increase of p-MeS in the initial feed, while p-MeS homopolymerization led to greater conversion than that of S. From the copolymers obtained using these initiator systems only those produced from S/p-MeS = 95/5 (mol/mol) in the feed showed to be crystalline, with Tm values lower than that of pure s-PS, making them easier to process

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

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