Synthesis and properties of vermiculite-reinforced polyurethane nanocomposites

Yuqiang Qian, Chris I. Lindsay, Chris MacOsko, Andreas Stein

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

Natural vermiculite was modified by cation exchange with long-chain quaternary alkylammonium salts and then dispersed in polyether-based polyols with different structures and ethylene oxide/propylene oxide ratios. The dispersions were evaluated by X-ray scattering and rheology. In all polyol dispersions tested, polyols were intercalated into the vermiculite interlayers. Also, significant shear thinning behavior was observed. A large interlayer spacing of ∼90 Å was achieved in one polyol suitable for polyurethane elastomer synthesis. In polyurethane made with this polyol, clay platelets were extensively intercalated or exfoliated. The composites showed a >270% increase in tensile modulus, >60% increase in tensile strength, and a 30% reduction in N 2 permeability with a loading of 5.3 wt % clay in polyurethane. Differential scanning calorimetry and dynamic mechanical analysis revealed that the nanoclay interacts with the polyurethane hard segments.

Original languageEnglish (US)
Pages (from-to)3709-3717
Number of pages9
JournalACS Applied Materials and Interfaces
Volume3
Issue number9
DOIs
StatePublished - Sep 28 2011

Keywords

  • barrier properties
  • elastomer
  • organoclay
  • polymer-clay nanocomposites
  • polyurethane
  • vermiculite

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