Thermoreversible gelation in poly(ethylene oxide)/carbon black hybrid melts

Antonios Kelarakis, Marta J. Krysmann, Emmanuel P. Giannelis

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The study focuses on the structure and viscoelasticity of poly(ethylene oxide)/carbon black fluids. The hybrids when subjected to extreme thermal annealing (at temperatures far above the melting point of the matrix) exhibit a 3-4 orders of magnitude increase in viscosity. Surprisingly, the effect is reversible and the viscosity reverts back to its initial value upon subsequent cooling. This rather unique sol-gel transition in terms of strength, steepness and thermal reversibility points to major structural rearrangements via extensive particle clustering, in agreement with microscopy observations. In related systems it was found that when matrix-particle electrostatic interactions are present the gelation is essentially diminished.
Original languageEnglish (US)
Pages (from-to)6278-6281
Number of pages4
JournalPOLYMER
Volume55
Issue number24
DOIs
StatePublished - 2014
Externally publishedYes

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