Chain extension study of aqueous polyurethane dispersions

Young Kuk Jhon, In Woo Cheong, Jung-Hyun Kim

Research output: Contribution to journalArticle

99 Citations (Scopus)

Abstract

In the several decades, aqueous polyurethane dispersion has been investigated by many researchers. However, relatively little systematic work has been reported in detail on chain extension process. This work describes the reaction of chain extension step (chain extended reaction) as the variation of residual NCO group and subsequent weight average molecular weight of the polyurethane during the chain extension step. Polyurethane dispersion was prepared by neutralization emulsification method. The dispersions with prepared different average particle sizes were obtained by varying the degree of neutralization and each of them chain extended subsequently by water-soluble chain extender; 1, 6-hexanediamine. Time-dependent change of free and residual NCO group was measured by FT-IR spectroscopy during the chain extension process. As the total surface area of polyurethane particle decreased, the amount of residual NCO group and consequently required amount chain extender for optimum chain extension decreased. According to the GPC and FT-IR data, optimum amount of 1, 6-hexanediamine was determined by the location of the NCO group and contact area between the residual NCO groups and water molecules. Additionally, it was found that excess amount of chain extender had an unfavorable influence on adhesive strength.

Original languageEnglish
Pages (from-to)71-78
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume179
Issue number1
DOIs
Publication statusPublished - 2001 Apr 1

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1,6-diaminohexane
Polyurethanes
Dispersions
Emulsification
Water
Infrared spectroscopy
Adhesives
Molecular weight
Particle size
Molecules
adhesives
water
molecular weight

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

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Chain extension study of aqueous polyurethane dispersions. / Jhon, Young Kuk; Cheong, In Woo; Kim, Jung-Hyun.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 179, No. 1, 01.04.2001, p. 71-78.

Research output: Contribution to journalArticle

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