Thermoset polyurea resins with in situ produced silicate filler from water glass: Effects of water dispersible alumina nanoparticles

N. Castellà, S. Grishchuk, J. Karger-Kocsis

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Proprietary polyurea based thermosets (3P resins) were produced from polymeric methylene diphenylisocyanate (PMDI) and water glass (WG) using a phosphate emulsifier, Water glass was dispersed in the PMDI and phosphate resulting in a water in oil (W/O) type emulsion. Water dispersible alumina of various nominal particle sizes (25 to 220 nm) were added in the WG in various amounts (1 and 5 wt-%) in absence and presence of an antifoaming agent in order to study their effects on the resulting cross-linked polyurea based systems. The latter contained microscaled polysilicate particles derived from the WG. The flexural stiffness, fracture toughness and energy of the related thermosets were slightly improved. On the other hand, the flexural strength and strain were reduced by incorporation of the aluminas. The results suggested that the alumina affected mostly the reaction pathways between WG and PMDI owing to their preferential location at the surface of the WG particles in the initial W (WG)/O (PMDI+ phosphate) emulsion.

Original languageEnglish
Pages (from-to)122-127
Number of pages6
JournalPlastics, Rubber and Composites
Volume36
Issue number3
DOIs
Publication statusPublished - 2007

Fingerprint

Silicates
Aluminum Oxide
Thermosets
Fillers
Alumina
Resins
Nanoparticles
Glass
Water
Phosphates
Emulsions
Antifoaming Agents
polyurea
Fracture energy
Bending strength
Fracture toughness
Oils
Particle size
Stiffness

Keywords

  • Alumina
  • Flexure
  • Fracture mechanics
  • Polyisocyanate
  • Polysilicate
  • Polyurea

ASJC Scopus subject areas

  • Ceramics and Composites
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Thermoset polyurea resins with in situ produced silicate filler from water glass : Effects of water dispersible alumina nanoparticles. / Castellà, N.; Grishchuk, S.; Karger-Kocsis, J.

In: Plastics, Rubber and Composites, Vol. 36, No. 3, 2007, p. 122-127.

Research output: Contribution to journalArticle

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