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Gels pp 82-85 | Cite as

Thermoreversible gelation in syndiotactic polystyrene/solvent systems

  • T. Roels
  • F. Deberdt
  • H. Berghmans
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 102)

Abstract

Thermoreversible gelation in solutions of syndiotactic poly-styrene (sPS) is investigated. Gelation in the solvents toluene, chlorobenzene, 1,2-dichlorobenzene, chloroform, 1,4-dioxane, tetrahydrofuran, o-xylene, cis- and trans-decalin is obtained by quenching the solutions in an ice bath.

Depending on the temperature and solvent-type, two gel types can be formed. Elastic, hazy gels (type I) can be obtained in all solvents by qnenching in an ice bath. Cooling of the solutions in cis- and trans-decalin to high temperatures, and heating of type I gels, leads to the formation of past-like, opaque gels (type II). This gel type melts at higher temperatures than gel type I.

The solvent-dependence of this behaviour is related to the stability domains in the temperature-concentration diagram of different crystalline modifications. In cis- and trans-decalin, a transformation from the helical phase (gel type II) to be zigzag phase (gel type II) can take place on heating.

Key words

Thermoreversible gelation syndiotactic polystyrene phase behaviour 

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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1996

Authors and Affiliations

  • T. Roels
    • 1
  • F. Deberdt
    • 1
  • H. Berghmans
    • 1
  1. 1.Laboratory for Polymer ResearchKatholieke Universiteit LeuvenHeverleeBelgium

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