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

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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.

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Authors and Affiliations

  1. Polymer Science Program, Department of Chemistry, University of Massachusetts Lowell, One University Avenue, Lowell, MA 01854, USA, , , , , , US

    Young Cheol Bae, Il-Jin Kim & Rudolf Faust

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  1. Young Cheol Bae
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  2. Il-Jin Kim
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  3. Rudolf Faust
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Received: 1 February 2000/Revised version: 23 April 2000/Accepted: 23 April 2000

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Bae, Y., Kim, IJ. & Faust, R. Halogen-free polyisobutylene by in situ methylation of living polyisobutylene using dimethylzinc. Polymer Bulletin 44, 453–459 (2000). https://doi.org/10.1007/s002890070065

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  • DOI: https://doi.org/10.1007/s002890070065

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