Aqueous Dispersion of Polyurethane Anionomer from Aliphatic Diisocyanates and Poly(Hexamethylene Carbonate) Diol |
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| Authors: | B K Kim C K Kim H M Jeong |
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| Institution: | 1. Department of Polymer and Science Engineering , Pusan National University , Pusan, 609-735, Korea;2. Department of Chemistry , University of Ulsan , Ulsan, 680-749, Korea |
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| Abstract: | Abstract Water dispersible polyurethanes (PUs) were prepared from poly(hexamethylene carbonate) (PHC) diol, isophorone diisocyanates (IPDI), hexamethylene diisocyanate (HDI), and dimethylolpropionic acid (DMPA) as latent anionic sites. After neutralization of the carboxyl group from the DMPA unit with triethylamine (TEA), the PU anionomers were dispersed by adding water, following by crosslinking using triethylenetetramine (TETA). The particle size of the dispersion decreased with the content of DMPA and increased with HDI in the HDI-IPDI system, and it exhibited a minimum when the number-average molecular weight (M n) of the prepolymer was 3000 and 4500, respectively. PUs with a higher content of hard segments from DMPA or TETA, or with a higher content of IPDI rather than HDI, had higher tensile moduli and storage moduli at room temperature. Ultimate tensile properties increased with an increase of the prepolymer molecular weight and the DMPA and HDI content. |
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