Abstract
Department of Polymer Science and Engineering, Pusan National University, Pusan 609-735, Korea(Received 22 July 1996; accepted 6 August 1996)Abstract: Following a prepolymer mixing process, polyurethane (PU) aniono-mer dispersions were prepared from polyethylene adipate glycol (PEA), iso-phorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI) and dimethylolpropionic acid (DMPA) as a potential ionic centre. E†ects of prepolymer molec-ular weight, PEA molecular weight, hard segment content, DMPA content,degree of neutralization and mixed diisocyanates have been studied in terms ofparticle size and viscosity of emulsion, and surface, mechanical and dynamicmechanical properties of the emulsion-cast Ðlms. Particle size decreased andemulsion viscosity increased with increase in prepolymer molecular weight andPEA molecular weight, DMPA content, the degree of neutralization and IPDIcontent in mixed isocyanate systems. The decrease in particle size was due toincreased chain Nexibility and/or hydrophilicity of the PU. The mechanical anddynamic mechanical properties of the PU ionomer dispersions were interpretedin terms of soft segmentEhard segment phase separations, hard segment content,chain Nexibility and coulombic forces.Key words: polyurethanes, anionomer dispersions, structureEproperty corre-lation, mechanical properties, dynamic mechanical properties.
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