Supercritical carbon dioxide-processed dispersed polystyrene-clay nanocomposites

Mihai Manitiu, Robert J. Bellair, Steven Horsch, Esin Gulari, Rangaramanujam M. Kannan

Research output: Contribution to journalArticle

Abstract

Achieving clay dispersion and improving clay-polymer interactions are keys to producing superior nanocomposites. A supercritical CO2 (scCO 2) processing method was utilized to prepare high molecular weight polystyrene (PS)/Cloisite 10A nanocomposites with significant dispersion and Theological enhancement. The effects of scCO2 processing, presence of cosolvent, and clay weight fraction on clay dispersion and polymer-clay interactions in nanocomposites were investigated. Rheology, WAXD, and TEM of the nanocomposites indicate that substantial improvements in the rheological properties of SCCO2 nanocomposites are the result of increased dispersion and polymer-clay interactions. At low frequencies, the elastic plateau modulus of the scCO2-processing nanocomposites (5 wt % clay loading) is more than 40-fold higher than benchmark solution-blended samples. Our results suggest that the substantial contacting with scCO2, followed by rapid depressurization, produces a combination of disorder and dispersion of this "as-received" clay, and the presence of the cosolvent enables more intimate contact of the high molecular weight PS and clay.

Original languageEnglish (US)
Pages (from-to)8038-8046
Number of pages9
JournalMacromolecules
Volume41
Issue number21
DOIs
StatePublished - Nov 11 2008
Externally publishedYes

ASJC Scopus subject areas

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

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