Polyurea resins with in situ produced silicate filler from water Glass: Static and dynamic mechanical properties

S. Erdélyi, J. Karger-Kocsis, G. Nagy

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Proprietary polyurea-based thermosets were produced from polyisocyanates and water glass (WG) using a phosphate-type phase transfer catalyst. WG was dispersed in the polyisocyanates of various functionality and viscosity resulting in water-in-oil (W/O) type emulsions. The particle size and particle size distribution of the polysilicate, derived from the WG and dispersed in the crosslinked polyurea matrix, have been determined. The flexural and fracture mechanical properties of the polyurea systems were measured under both static (v=1mm/min) and dynamic loading conditions (v=1m/s). It was found that the flexural strength is very sensitive on the dispersion state of the polysilicate. The dispersion state was mostly affected by the viscosity of the polyisocyanate and in lesser extent by its functionality and reactivity. The fracture mechanical response of the polysilicate filled polyurea systems did not depend on the deformation rate. This was corroborated by fractographic inspection of the fracture surfaces of compact tension (CT, static loading) and notched Charpy (dynamic loading) specimens used for the fracture mechanical study.

Original languageEnglish
Pages (from-to)21-31
Number of pages11
JournalJournal of Macromolecular Science, Part B: Physics
Volume46 B
Issue number1
DOIs
Publication statusPublished - Jan 1 2007

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Keywords

  • Failure
  • Flexure
  • Fracture mechanics
  • Polyisocyanate
  • Polysilicate
  • Polyurea

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Polymers and Plastics
  • Materials Chemistry

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