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Living carbocationic polymerization

LXI. Narrow molecular weight distribution polyisobutylenes prepared by esters and ketones as electron donors

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Abstract

Electron donors (EDs) effectively mediate living carbocationic polymerizations (LC⊕Pzn), for example, that of isobutylene (IB). The purpose of this research was to investigate the effect of various new EDs, specifically esters and ketones on the LC⊕Pzn of IB, and to determine the effect of these EDs on the molecular weight distribution, (MWD) of polyisobutylene (PIB) under various experimental conditions. Thus the LC⊕Pzn of IB was effected by the dicumyl chloride (DCC)/BCl3 initiating system in the presence of various EDs, such as dimethyl phthalate, di-t-octyl phthalate, methyl benzoate, ethyl isobutyrate, dimethyl 3,3-dimethylglutarate, dimethyl terephthalate, dimethyl 5-t-butyl-isophthalate, trimethyl 1,3,5-benzenetricarboxylate; and acetophenone and benzophenone, in CH3Cl at-80°C, and the \(\overline M _w /\overline M _n \) of the PIB was determined. It was found that the nature and the concentration of the ED strongly influence MWD. Under well-defined conditions in the presence of dimethyl phthalate or di-t-octyl phthalate, polymers with close to Poisson distribution \(\left( {\overline M _w /\overline M _n = {\text{1}}{\text{.03}}} \right)\) could be obtained.

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Authors and Affiliations

  1. Maurice Morton Institute of Polymer Science, The University of Akron, 44325-3909, Akron, OH, USA

    Jiaoshi Si & J. P. Kennedy

Authors
  1. Jiaoshi Si
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  2. J. P. Kennedy
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Additional information

For paper LX in this series see I. Majoros, J.P. Kennedy, et al. Polym. Bull. 31, 255 (1994)

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Si, J., Kennedy, J.P. Living carbocationic polymerization. Polymer Bulletin 33, 651–656 (1994). https://doi.org/10.1007/BF00296078

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  • DOI: https://doi.org/10.1007/BF00296078

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