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- W2038863535 abstract "Anionic polyurethane prepolymers end-capped with isocyanate groups were dispersed and chain-extended in aqueous media using three different extension agents: hydrazine, 1,2-ethylene diamine (EDA) and 1,2-propylene diamine (PDA). Two types of prepolymer were used. The first was prepared from isophorone diisocyanate (IPDI), α,α-dimethylol propionic acid (DMPA) and poly(propylene oxide) diol (PPO) and the second from α,α,α′,α′-tetramethyl-1,3-xylylene diisocyanate (m-TMXDI), poly(caprolactone) diol (PCL) and DMPA. The colloidal particles which formed in the dispersion process and the constituent poly(urethane–urea) chains were characterised by a combination of dynamic and static light scattering, gel permeation chromatography and FTIR spectroscopy. Using EDA as the extender, a study was made of how the degree of extension depended on the molar ratio of amine to isocyanate groups, [NH2]/[NCO] (= RA, I). It was found that using a stoichiometric balance of isocyanate and amine groups did not lead to high degree of extension, and better chain extension was obtained at lower RA, I values. In a comparative study using stoichiometric balances of isocyanate and amine groups, the degrees of extension obtained using PDA and EDA were approximately the same, while hydrazine was the least effective. Force–extension studies were carried out on samples prepared from films cast from the aqueous poly(urethane–urea) dispersions in order to assess the influence of chain-extender type and stoichiometry on bulk properties; values of Young's modulus, tensile strength and maximum extension are reported. Copyright © 2003 Society of Chemical Industry" @default.
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- W2038863535 date "2003-01-01" @default.
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- W2038863535 title "The chain extension of anionic prepolymers in the preparation of aqueous poly(urethane-urea) dispersions" @default.
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- W2038863535 doi "https://doi.org/10.1002/pi.1196" @default.
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