Comparative Study on the Mean-Field and Scaling Theories of Temperature—Concentration Dependence of Slightly Cross-Linked Gel Systems

Miklós Zrinyi, Ferenc Horkay

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Abstract

The temperature dependence of the concentration of loosely cross-linked polymer networks swollen to equilibrium in poor solvent has been studied. An attempt is made to compare the prediction of different theories with experimental results. It is shown that the classical James-Guth network theory gives almost the same result as the modern thermal blob theory. Both theories predict universal dependence if scaled concentration and scaled temperature are used. This dependence excludes the possibility of first-order phase transition in gels below the 0 point. The Flory-Hermans-Wall-Kuhn theory predicts a collapse phenomenon, which has not been observed in our experiments. The results exhibited by poly(vinyl acetate) networks of different cross-linking densities swollen in isopropyl alcohol are diametrically opposed to those predicted on the basis of the Flory-Hermans-Wall-Kuhn theory, while the agreement with the James-Guth and thermal blob theories is quite satisfactory.

Original languageEnglish
Pages (from-to)394-400
Number of pages7
JournalMacromolecules
Volume22
Issue number1
DOIs
Publication statusPublished - Jan 1 1989

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ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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