Aqueous polyurethane anionomer dispersions were prepared from isophorone diisocyanate, poly(tetramethylene adipate glycol) (PTAd) and dimethylol propionic acid as potential anionic centres. The effects of polyol molecular weight (Mn) on the state of dispersion, thermal, mechanical and viscoelastic properties and swelling of emulsion-cast film were determined. With increasing Mn of PTAd, the particle size of the emulsion and soft segment glass transition temperature, Tg, decreased, and solvent swelling, emulsion viscosity and hard segment Tg increased. Tensile strength showed a minimum with PTAd 1000, and elongation at break generally increased with the M n of PTAd. These results could be interpreted in terms of soft segment-hard segment phase separation and crystallization of high molecular weight PTAd
Посилання на статтю:
Effect of soft segment length on the properties of polyurethane anionomer dispersion / Young Min Lee, Jong Cheol Lee and Byung Kyu Kim // Polymer. – 1994. – Vol 35. – P. 1095-1099.