Kinetic aspects of chain extension reaction using water-soluble diamines in aqueous polyurethane dispersion

In Woo Cheong, Hyun Chul Kong, Jin Sup Shin, Jung Hyun Kim

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Chain extension reaction using water-soluble chain extenders was investigated with varying carbon number of the chain extenders (ethylene diamine, diaminobutane, and 1,6-hexane diamine) and their feed rates in the preparation of polyurethane dispersions using prepolymer method. The chain extension reaction between residual NCO groups from aliphatic diisocyanate (isophorone diisocyanate) and water-soluble diamines was observed by monitoring pH of the aqueous phase. A separate swelling experiment using these water-soluble diamines was conducted to investigate the locus of chain extension reaction and chain extension model based on the experimental results was suggested. Apparent reaction rate obtained by pulse-relaxation and the time-evolution average particle size were strongly dependent on the chain length of the diamines as well as feed rate of the chain extender. Moreover, the tensile strength and elongation of the thin films cast from these polyurethane dispersions were also influenced by the chain length.

Original languageEnglish
Pages (from-to)511-518
Number of pages8
JournalJournal of Dispersion Science and Technology
Volume23
Issue number4
DOIs
Publication statusPublished - 2002 Jul

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Polymers and Plastics

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