Date of Publication:2010-01-01

Journal:石油化工

Affiliation of Author(s):化工学院

Issue:8

Page Number:929-935

ISSN No.:1000-8144

Abstract:A series of star-like polystyrenes were synthesized through retarded anionic polymerization with self-made multi-lithium (m-Li) as initiator, i-Bu3Al (TIBA) as retarder and cyclohexane as solvent. Kinetics of the styrene polymerization was studied. The pseudo first order apparent propagation rate constants and the apparent propagation activation energies (E��) were obtained by calculation. Influences of TIBA dosage on the polystyrene relative molecular mass and its distribution were investigated. The results showed that the kinetics curve was first order and linear under different polymerization conditions. At a certain polymerization temperature, the polymerization rate dropped with increase of n(TIBA): n(m-Li)significantly; when n(TIBA): n(m-Li) was more than 1, the polymerization completely stopped. Lowering the polymerization temperature could also reduce the polymerization rate, but the influence of n(TIBA): n(m-Li)on the polymerization rate is more obvious. With increase of n(TIBA): n(m-Li), E�� rose gradually and relative molecular mass distribution of the synthesized polystyrene widened little by little.

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