Synthesis and Hydrogenation of 1,2-1,4-1,2-Stereotriblock Polybutadienes and the Study of Their Properties
作者:
Hongquan Xie,
Liren Ma,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1985)
卷期:
Volume 22,
issue 10
页码: 1333-1346
ISSN:0022-233X
年代: 1985
DOI:10.1080/00222338508063338
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The effects of various polar modifiers, their concentration, and the polymerization temperature on the microstructure of poly-butadiene obtained during anionic polymerization using lithium α-methyl naphthalene as the bifunctional initiator were studied. 1,2-1,4-1,2-Stereotriblock polybutadiene was synthesized by polymerization in cyclohexane to a certain conversion and polymerization was completed in the presence of diethylene glycol dimethyl ether. The microstructure of the stereotriblock copolymer was characterized by IR and1H-NMR. GPC showed that the stereo-block polybutadiene has a narrow MWD. Two Tg's of the copolymer with higher molecular weight exist, as shown by dynamic mechanical test. The stereotriblock copolymer was hydrogenated using cobalt 2-ethyl hexanoate and triisobutyl aluminum as the catalyst. The hydrogenated product was shown to be a (butene-1-ethylene-butene-1) triblock copolymer which consists of more than 30% crystallinity and exhibits the behavior of a thermoplastic elastomer. The relationship between stress-strain properties arid the contents of the blocks was also studied.
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