Part of #Synthesis and Thermal behavior of poly (ethylene oxide) poly (N-substituted urethane)# :
Publishing year : 2005
Conference : The 10th National Congress of Chemical Engineering of Iran
Number of pages : 14
Abstract: Waterborne polyurethane as a new polymer dispersion was synthesized using relatively hydrophilic polyols. Poly (N-Substituted urethanes) with a different molecular weight of the polyethylene glycol monomethyl ether side chain were synthesized in the form of sodium hydride, chlorinated
polyethylene glycol monomethyl ether (PEGMME), and polyether and polyester urethane containing poly tertahydrofuran or polycaprolactone / toluene diisocyanate and 1,4-butanediol. The chemical structures were characterized by FTIR and FT1HNMR. To investigate the effect of
Different MW of the N-substituted side chain is the morphology, thermal property and particle size distribution of the final product, we used differential scanning calorimetry and laser light scattering. N-Substitution of polyurethane has significant effects on the thermal properties and the solubility of the resulting material. The amount of N-substituted urethane decreases with N-substitution and gradually increases with increasing molecular weight of the substituted bore chain. This is more obvious in higher molecular weight. The particle size of the final water-borne PU emulsion also decreases with increasing MW of PEGMME. The decreasing particle size may be due to increased N-substituted polyurethanes elongation and / or hydrophilicity.