Polybutadiene Modification: Reactions of Halogen-Containing Polybutadienes with Organolithium Compounds
作者:
E. Ceauşescu,
R. Bordeianu,
E. Buzdugan,
I. Cerchez,
P. Ghioca,
R. Stancu,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1985)
卷期:
Volume 22,
issue 5-7
页码: 803-818
ISSN:0022-233X
年代: 1985
DOI:10.1080/00222338508056637
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Polybutadiene (PB) can be easily halogenated by reaction with iodine chloride or bromine in tetrahydrofuran. The resulting glassy polymers were reacted with n-butyllithium, sec-butyl-lithium, and polystyryllithium in THF. Iodochlorinated PB gave a polybutadiene with a different cis/trans ratio with n-BuLi. The reformation of PB was accompanied by partial crosslinking. The reaction probably involved a halogen-metal exchange followed by intra- and intermolecular elimination of Li halide. With brominated PB, both coupling and elimination took place. With sec-BuLi, an allylic iodine derivative was obtained from iodochlorinated PB, probably by dehydrochlorination. The iodinated intermediate can easily undergo a coupling reaction with further sec-BuLi. Both iodochlorinated and brominated polybutadienes gave graft copolymers by reaction with polystyryllithium in THF. Grafting was always accompanied by gel formation.
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