• Elastomers and Composites
• /
• v.34 no.5
• /
• pp.399-406
• /
• 1999

Polyurethane (PU) prepolymers were synthesized from polytetramethylene ether glycol (PTMG), 4,4'-diphenylmethane diisocyanate (MDI), toluene 2,4-diisocyanate (TDI) and isophoron diisocyanate (IPDI). After chain extention using dimethyol propionic acid (DMPA), aqueous polyurethane anionomers were prepared from triethyl amine (TEA) as a neutralizer. The effect of the content of chain extender and the degree of neutralization on the state of emulsification, adhesive strength, viscosity, glass transition temperature and physical properties of emulsion cast film were investigated using UTM, Viscometer and DSC.

• Proceedings of the Korean Fiber Society Conference
• /
• 2001.10a
• /
• pp.21-24
• /
• 2001

Polyurethane are used for a wide range of commercial applications such as adhesives or coatings for various substrates including textile fabric, plastic, wood, glass fiber, and metals. The types of polyurethane ionomers have been reported according to the ionic charges on the polymer main chain, i.e. anionomer, cationomer, and zwitterconomers. (omitted)

• Textile Coloration and Finishing
• /
• v.5 no.4
• /
• pp.60-66
• /
• 1993

Aqueous polyurethane(PU) anionomer dispersions were prepared from isophorone diisocyanate (IPDI), polytetramethylene adipate glycol(PTAd) and dimethylol propionic acid(DMPA) as potential anionic centers. 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, particle size of emulsion and soft segment T$_{g}$ decreased, and solvent swell, emulsion viscosity, and hard segment $T_{g}$ increased. Tensile strength showed minimum with PTAd 1000, and elongation at break generally increased with the Mn of PTAd. These results were possibly nterpreted in terms of soft segment-hard segment phase separation and crystallization of high molecular weight PTAd.