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Direct evidence of crosslinks in a butadiene-dimethyldivinylsilane copolymer by metathesis degradation

✍ Scribed by K. Hummel; E. Hubmann; M. Dösinger; T. Pongratz

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 373 KB
Volume: 27
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(91)90110-a

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✦ Synopsis

Abstraet--A butadiene-dimethyldivinylsilane copolymer with 5.6 mol% dimethyldivinylsilane (MVS) was obtained with n-butyl-lithium as initiator. It was degraded by cross metathesis with (E)-4-oetene or (E)-3-hexene in the presence of the catalyst WC1JSn(CH3)4. The reaction mixtures were investigated by means of gas chromatography/mass spectrometry coupling. The degradation products contained 1,4-1inked butadiene (1,4B), 1,2-1inked butadiene (1,2B) and tetrafunetionaUy polymerized MVS.

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Reaction of a partially brominated alternating butadiene-propene copolymer with 1,6-bis(bromomagnesium) hexane: Evidence of crosslinks by metathesis degradation

✍ K. Hummel; E. Hubmann; T. Pongratz 📂 Article 📅 1988 🏛 Elsevier Science 🌐 English ⚖ 285 KB

An alternating butadiene-propene copolymer was partially ct-brominated with N-bromosuccinimide; then reaction with 1,6-bis(bromomagnesium) hexane was carried out. The modified copolymer was degraded in a metathesis reaction with (E)-4-octene. The low molecular products were identified by means of ga