Properties of water-blown rigid polyurethane foams with reactivity of raw materials

W. J. Seo, J. H. Park, Y. T. Sung, D. H. Hwang, W. N. Kim, H. S. Lee

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

Rigid polyurethane foams (PUFs) were prepared from polymeric 4,4-diphenylmethane diisocyanate (PMDI; having functionality of 2.9), polyether polyols, silicone surfactant, amine catalysts, and distilled water. The effects of reactivity on the properties such as density, compressive and flexural strength, and glass-transition temperature (Tg) of the PUF samples were studied. The kinetic rate of forming the PUF samples was increased with the catalyst and water content. With increasing OH value and functionality of the polyols, the density and compressive strength of the PUP samples also increased, For the PUF samples synthesized with polyols having high functionality (>5), the flexural strength of the PUP samples decreased with the functionality of the polyols. With increasing OH value and functionality of the polyols, the Tg. of the PUF increased because of an increase in the degree of crosslinking of the PUF samples. The Tg value and compressive strength of the PUF samples were observed to increase with the NCO index. From this result, it was suggested that the increase in the Tg value and compressive strength of the PUF samples may be attributable to the additional crosslinks that arose from allophonate and biuret formation by the supplementary reactions of excess PMDI.

Original languageEnglish
Pages (from-to)2334-2342
Number of pages9
JournalJournal of Applied Polymer Science
Volume93
Issue number5
DOIs
Publication statusPublished - 2004 Sep 5

Keywords

  • Foams
  • Glass transition
  • NCO index
  • OH value
  • Reactive processing

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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