Stability of propagating species in living carbocationic polymerization

Daniela Held, Béla Iván, Axel H.E. Müller, Feike De Jong, Teun Graafland

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The stability of living polyisobutylene chains obtained by the 1,3-di(2-chloro-2-propyl)-5-tert-butylbenzene (tBuDiCumCl)/TiCl4 initiating system was investigated under monomer starved conditions (100% monomer conversion) in the absence and presence of different additives, such as N,N-dimethylacetamide (DMA), 2,6-di-tert-butylpyridine (DtBP), pyridine (Py) and 2,4-dimethylpyridine (DMPy), in CH2Cl2/hexane (40:60 v/v) mixture at -78°C. With the exception of DtBP, all the additives resulted in unexpected stability of the propagating carbocationic species in these systems. Only negligible amounts of chain ends with expected double bonds were formed as verified by 1H NMR. However, molecular weight data suggest that there is difference in the effect of the examined nucleophilic compounds in their mode of action during living polymerization of isobutylene. It is concluded that the currently existing mechanistic propositions cannot satisfactorily explain experimental results of living isobutylene polymerization.

Original languageEnglish
Pages (from-to)333-334
Number of pages2
JournalAmerican Chemical Society, Polymer Preprints, Division of Polymer Chemistry
Volume37
Issue number1
Publication statusPublished - Mar 1 1996

ASJC Scopus subject areas

  • Polymers and Plastics

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