Indexed by:期刊论文

Date of Publication:2022-06-28

Journal:Chemical Journal of Chinese Universities

Volume:42

Issue:3

Page Number:866-874

ISSN No.:0251-0790

Key Words:"Living anonic polymerization; Di-lithium initiator; Alkynyl functionalization; Thermoplastic elastomer"

CN No.:22-1131/O6

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 alpha,omega-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 monofunctional 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 alpha,omegaend 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.

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