Living carbocationic polymerization - XXII. Effect of polymer precipitation on molecular weight

M. Zsuga, J. P. Kennedy, T. Kelen

Research output: Article

9 Citations (Scopus)

Abstract

The effect of polymer precipitation that occurs during polymerization on the number average molecular weight -Mn has been investigated in conjunction with the recently described trans-2,5-diacetoxy-2,5-dimethyl-3-hexene (DiAcODMH6)/BCl3/isobutylene(IB)/CH3Cl/- 35° system using both the IMA and AMI techniques. All the experimental data could be described by a common rectilinear l/-Mn versus l/Wp (Wp = weight of polymer) plot exhibiting an intercept l/-Mn,max. A simple equation has been derived that explains quantitatively the results and suggests that product molecular weights obtained in heterogeneous polymerizations are determined by polymer precipitation which in turn leads to chain transfer. An Arrhenius analysis of -Mn,max values obtained at various temperatures corroborates this proposition and suggests polymer precipitation to control -Mn. That precipitation conditions determine -Mn seem also to hold true for conventional AlCl3-induced IB polymerizations.

Original languageEnglish
Pages (from-to)427-433
Number of pages7
JournalPolymer Bulletin
Volume19
Issue number5
DOIs
Publication statusPublished - máj. 1988

Fingerprint

Living polymerization
molecular weight
Polymers
polymerization
Molecular weight
Polymerization
polymers
butenes
hexenes
plots
products
Temperature
temperature
isobutylene

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

Cite this

Living carbocationic polymerization - XXII. Effect of polymer precipitation on molecular weight. / Zsuga, M.; Kennedy, J. P.; Kelen, T.

In: Polymer Bulletin, Vol. 19, No. 5, 05.1988, p. 427-433.

Research output: Article

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