808 橡　胶　工　业 2019年第66卷
Effect of Structure Regulator DTHFP on Microstructure of SSIR
WANG Xu 1，WANG Wenheng 1，LIAO Mingyi 1，WANG Xue 2，LI Hongbo 2，LIANG Aimin 2
（1.Dalian Maritime University ，Dalian  116026，China ；2.Yanshan Branch ，Beijing Research Institute of Chemical Industry ，SINOPEC ，Beijing 
102500，China
）Abstract ：A styrene （St ）-isoprene （Ip ） rubber （SSIR ） was synthesized by living anionic
polymerization using cyclohexane as solvent ，n -butyllithium as initiator ，and new structure regulator 2，2-di
（2-tetrahydrofuryl ）propane （DTHFP ），and DTHFP was compared with conventional structure regulators ，tetrahydrofuran and ethyl tetrahydrofurfuryl ether.The effects of the addition level of DTHFP ，the weight ratio of St /Ip ，the reaction time and temperature on the microstructure of the SSIR were investigated.The results showed that the content of 3，4-Ip structural units in SSIR increased with the in
crease of the addition level of structural regulator.Among the three structure regulators ，DTHFP had the strongest regulation ability ，and when the molar ratio of DTHFP /n -BuLi was at 0.5，the mass fraction of 3，4-Ip structural units reached as high as 0.680 5.DTHFP could increase the polymerization rate of St and Ip monomer ，and the ability to adjust St monomer was stronger. The change of weight ratio of St /Ip had little effect on the microstructure ，and the effect of lowering the reaction temperature appropriately was equivalent to increasing the addition level of DTHFP.
Key words ：DTHFP ；structure regulator ；SSIR ；anionic polymerization ；microstructure
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