Cationic reactions in the melt - 1. The effect of lewis acids on polystyrene

B. Pukánszky, Joseph P. Kennedy, Tibor Kelen, Ferenc Tüdos

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The effect of Lewis acids of different acidities, i.e., AlCl3 and Bu2SnCl2, on polystyrene melt has been investigated using the mixing chamber of a Brabender Plastograph at 180°C. The torque was monitored as a function of time and molecular weights of periodically withdrawn samples were determined. The structure of select samples has-been analyzed by 1H-NMR spectroscopy. A sequence of complex physical and chemical transformations has been identified. The addition of Lewis acids to polystyrene melts causes an immediate drastic decrease in the torque due to rapid partial polymer degradation which is followed by homogenization and a slower degradation phase. There is evidence for the formation and accumulation of unsaturation during degradation. Cationic reactions induced by the Lewis acids readily explain the observed sequence of chemical transformations.

Original languageEnglish
Pages (from-to)469-476
Number of pages8
JournalPolymer Bulletin
Volume5
Issue number8
DOIs
Publication statusPublished - 1981

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Lewis Acids
Polystyrenes
polystyrene
degradation
Degradation
acids
Acids
torque
Torque
homogenizing
Acidity
acidity
Nuclear magnetic resonance spectroscopy
molecular weight
Polymers
chambers
Molecular weight
nuclear magnetic resonance
causes
polymers

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics

Cite this

Cationic reactions in the melt - 1. The effect of lewis acids on polystyrene. / Pukánszky, B.; Kennedy, Joseph P.; Kelen, Tibor; Tüdos, Ferenc.

In: Polymer Bulletin, Vol. 5, No. 8, 1981, p. 469-476.

Research output: Contribution to journalArticle

Pukánszky, B. ; Kennedy, Joseph P. ; Kelen, Tibor ; Tüdos, Ferenc. / Cationic reactions in the melt - 1. The effect of lewis acids on polystyrene. In: Polymer Bulletin. 1981 ; Vol. 5, No. 8. pp. 469-476.
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