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Preparation and properties of waterborne polyurethanes based on triblock glycol (CL)4.5-PTMG-(CL)4.5 for water vapor permeable coatings: Effect of soft segment content

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Abstract

A series of waterborne polyurethanes (WBPU) were prepared from 4,4-dicyclohexylmethane diisocyanate (H12MDI), 2,2-bis(hydroxylmethyl) propionic acid (DMPA), ethylenediamine (EDA), triethylamine (TEA), and triblock glycol [TBG, (ε-caprolactone)4.5-poly(tetramethylene ether) glycol (MW=2000)-(ε-caprolactone)4.5: (CL)4.5-PTMG-(CL)4.5, MW=3000] as a soft segment. Two melting peaks of TBG at about 14°C and 38°C were observed indicating the presence of two different crystalline domains composed of CL and PTMG dominant component. The effect of soft segment content (60–75 wt%) on the colloidal properties of dispersion, and thermal and mechanical properties of WBPU films, the water vapor permeability (WVP) and water resistance (WR) of WBPU-coated Nylon fabrics, and the adhesive strength of WBPU-coated layer and Nylon fabrics was investigated. As soft segment contents increased, the water vapor permeability of WBPU-coated Nylon fabrics increased from 3615 to 4502 g/m2day, however, the water resistances decreased from 1300 to 500 mmH2O.

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Authors and Affiliations

  1. Department of Textile Engineering, Pusan National University, 609-735, Pusan, Korea

    Yong Sil Kwak & Han Do Kim

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  1. Yong Sil Kwak
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  2. Han Do Kim
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Correspondence to Han Do Kim.

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Kwak, Y.S., Kim, H.D. Preparation and properties of waterborne polyurethanes based on triblock glycol (CL)4.5-PTMG-(CL)4.5 for water vapor permeable coatings: Effect of soft segment content. Fibers Polym 3, 153–158 (2002). https://doi.org/10.1007/BF02912660

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  • DOI: https://doi.org/10.1007/BF02912660

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