Halogen-free polyisobutylene by in situ methylation of living polyisobutylene using dimethylzinc.

Autor: Bae, Young Cheol, Kim, Il-Jin, Faust, Rudolf
Zdroj: Polymer Bulletin; Jul2000, Vol. 44 Issue 5/6, p453-459, 7p
Abstrakt: Halogen-free polyisobutylene (PIB) was synthesized by in situ methylation of living PIB using dimethylzinc. Quantitative methylation of living PIB was achieved within 60 min using a ratio of [(CH3)2Zn]/[TiCl4]0= 1 without any side reactions. Under similar conditions, living PIB capped with 1,1-diphenylethylene (PIB-DPE+) yielded close to 1:1 mixture of methoxy- and methyl-functionality. By using the ratio of [(CH3)2Zn]/[TiCl4]0≥ 3, however, quantitative methylation of PIB-DPE+ could be achieved in 120 min without any side reactions as confirmed by spectroscopic and chromatographic analyses. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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