On the Cooccurrence of Demixing and Thermoreversible Gelation of Polymer Solutions. 1. Experimental Observations

L. M. Jelich, S. P. Nunes, E. Paul, B. A. Wolf*

*Corresponding author for this work

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23 Scopus citations

Abstract

The phase diagram of the system 2-propanol/poly(n-butyl methacrylate) (2-POH/PBMA) was determined for two narrowly distributed polymer samples of Mwca. 500000. Demixing curves were measured viscometrically and visually and gelation curves by means of the velocity of a falling body. A third curve (situated within the two-phase region and also resulting from viscosity measurements), which can be related to the aggregation of droplets of the segregated phase upon cooling, is also presented. the evaluation of the gelation conditions for homogeneous solutions according to Eldridge and Ferry yields 37 kj/mol of cross-links for the heat of gelation. Measurements with lower molecular weight PBMA (Afw8900) confirm the cooccurrence of phase separation and gelation, although the stability of the gels against shear is rather low in this case. the exchange of the 0-solvent 2-POH against ethanol, 1-propanol, 1-butanol, or n-decane does not reveal principal differences.

Original languageEnglish (US)
Pages (from-to)1943-1947
Number of pages5
JournalMacromolecules
Volume20
Issue number8
DOIs
StatePublished - Aug 1 1987
Externally publishedYes

ASJC Scopus subject areas

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

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