Bulk Polymerization of Styrene and 4‐Methylstyrene with Cp*Ti(OBu) 3 /MAO/TIBA Catalyst | Zendy

Hong J.L. | Zendy; Chen Y.P. | Zendy

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Bulk Polymerization of Styrene and 4‐Methylstyrene with Cp*Ti(OBu) 3 /MAO/TIBA Catalyst

Author(s) -

Hong J.L.,

Chen Y.P.

Publication year - 2002

Publication title -

journal of the chinese chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.329

H-Index - 45

eISSN - 2192-6549

pISSN - 0009-4536

DOI - 10.1002/jccs.200200028

Subject(s) - chemistry , polymerization , styrene , reactivity (psychology) , toluene , polymer chemistry , copolymer , cyclohexane , catalysis , monomer , solvent , molar mass distribution , chain transfer , tacticity , yield (engineering) , hydrogen , chain termination , photochemistry , polymer , organic chemistry , radical polymerization , materials science , medicine , alternative medicine , pathology , metallurgy

Copolymerization of different amounts of styrene (St) and 4‐methylstyrene (MSt) using Cp*Ti(OBu) 3 /MAO/TIBA catalyst was performed in bulk state under hydrogen atmosphere. With out the participation of a reaction solvent, polymerization proceeded well with better yield as compared to those with toluene or cyclohexane as reaction solvent. The sharp peaks in the 13 C NMR spectra indicate that both the St and MSt units in the copolymers are co‐syndiotactic in nature. The reactivity ratio evaluated from a Fineman‐Ross plot suggests a better reactivity of MSt than St monomers. Experiments also indicate that the decrease of M n and M w , and the broadening of molecular weight distribution were accompanied by the higher hydrogen pressure employed in the polymerization stage, a result attributed to the chain transfer reaction promoted by the hydrogen gas.

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