Date of Publication:2018-01-01

Journal:弹性体

Volume:28

Issue:2

Page Number:39-44

ISSN No.:1005-3174

Abstract:The structure of foreign lithium isoprene rubber(IR)was analyzed,and also the linear and star shaped IR was synthesized by using alkyl lithium as initiator in non-polar solvent.The rela-tionship between the relative molecular weight of linear IR and the content of cis 1,4-structure was studied,With the increase of molecular weight,the content of cis 1,4-structure increased,total 1,4-structure content increased slightly.The curves of relative molecular weight and the content of cis 1,4-structure were obtained,when the weight average molecular weight(Mw)was greater than 1 million 600 thousand,the content of cis 1,4-structure was up to 87%.At the same time,the relationship be-tween the relative molecular weight,intrinsic viscosity and branching factor of linear,star shaped IR and foreign samples were studied,the foreign samples are in good agreement with the linear IR curve. The content of cis 1,4-structure of lithium-based IR was higher than that of foreign samples,the mo-lecular weight and distribution are comparable to those of foreign samples.

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