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Preparation and properties of waterborne polyurethane‐urea/sodium alginate blends for high water vapor permeable coating materials

2007; Wiley; Volume: 105; Issue: 3 Linguagem: Inglês

10.1002/app.25731

1097-4628

Jong‐Kook Yun, Hye‐Jin Yoo, Han‐Do Kim,

Flame retardant materials and properties

Abstract To improve the water vapor permeability of coating materials, aqueous sodium alginate (SA) solution was blended with waterborne polyurethane‐urea (WBPU) dispersions synthesized by prepolymer mixing process. The content of SA for stable WBPU/SA dispersions was found to be below 30 wt %. As the SA content increased, the number and density of total micropores (tunnel‐like micropores/isolated micropores) formed after dissolution of SA in water increased, and the water vapor permeability of coated Nylon fabric also increased remarkably. These results clearly demonstrate that utilizing WBPU/water soluble polymer SA blends as coating materials and then dissolving SA in water surely facilitate obtaining prominent breathable fabrics. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007