Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (3): 866.doi: 10.7503/cjcu20200596

• Polymer Chemistry • Previous Articles     Next Articles

Synthesis of αω⁃End Alkynyl-functionalized Styrene-isoprene-styrene Polymer Based on Di-lithium Method

YANG Lincan, LENG Xuefei(), HAN Li, LI Chao, ZHANG Songbo, LEI Lan, MA Hongwei, LI Yang()   

  1. State Key Laboratory of Fine Chemicals,Department of Polymer Science and Engineering,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China
  • Received:2020-08-24 Online:2021-03-10 Published:2021-03-08
  • Contact: LENG Xuefei E-mail:lengxuefei@dlut.edu.cn;liyang@dlut.edu.cn
  • Supported by:
    ? Supported by the National Key R&D Program of China(2017YFB0307101)

Abstract:

Styrene-isoprene-styrene(SIS) triblock polymer is widely used thermoplastic elastomer(TPE) material. Establishing an efficient, precise and universal method for SIS functionalization has always been the key to improve the properties of TPE materials. Herein, the αω-end alkynyl-functionalized SIS polymer was synthesized efficiently by using the di-lithium initiation method and capped with alkynyl-functionalized monomer. First, the bi-functional di-lithium initiator was synthesized by the reaction of diene monomer with mono- functional initiator. Then, using lithium t-butoxide as the additive of the isoprene polymerization and potassium t-butoxide as the additive of the styrene polymerization, SIS triblock polymer with low vinyl content(5.8%) and narrow polydispersity index(<1.17) was synthesized. Whereafter, using di-lithium compound as initiator, adding alkynyl-functionalized 1,1-diphenylethylene(DPE) derivative for end-capping in one step, the αω-end alkynyl-functionalized SIS triblock "brick" polymer was synthesized with efficiency higher than 90%. Combined with the study of “click” reaction of alkynyl group, the preparation of thermoplastic elastomer materials with functional groups and topology could be realized.

Key words: Living anonic polymerization, Di-lithium initiator, Alkynyl functionalization, Thermoplastic elastomer

CLC Number: 

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