Halogen-free polyisobutylene by in situ methylation of living polyisobutylene using dimethylzinc |
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| Authors: | Young Cheol Bae Il-Jin Kim Rudolf Faust |
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| Affiliation: | (1) Polymer Science Program, Department of Chemistry, University of Massachusetts Lowell, One University Avenue, Lowell, MA 01854, USA, US |
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| Abstract: | Summary 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. Received: 1 February 2000/Revised version: 23 April 2000/Accepted: 23 April 2000 |
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