Structure and properties of star shaped miktoarm isoprene-butadiene-styrene rubber

Abstract

Star shaped miktoarm isoprene-butadiene-styrene rubber with high wet skid resistance and low rolling resistance was prepared by living anionic solution polymerization with n-butyl lithium as initiator, cyclohexane as solvent, sodium dodecylbenzene sulfonate/tetramethylethylenediamine as complex regulator and divinylbenzene as coupling agent, the effects of polymerization temperature and amount of complex structure regulator and coupling agent on microstructure, dynamic mechanical pro-perties and mechanical properties of the polymer were investigated. The results showed that the content of non-1,4-unit in the polymer increased gradually with increase of the amount of complex regulator, and decreased with rise of polymerization temperature. The loss factor of the polymer at 0 ℃ increased gradually with increase of the amount of complex regulator and dropping of polymerization temperature, which improved wet resistance of the polymer; The loss factor at 60 ℃ decreased gradually with increase of the amount of coupling agent, which reduced rolling resistance of the polymer. In addition, molecular weight distribution of the polymer became wider after coupled and its processability was improved.

Keywords

• isoprene-butadiene-styrene rubber
• microstructure
• wet skid resistance
• rolling resistance
• regulator
• star shaped miktoarm rubber