چكيده لاتين :
Waterborne polyurethane as a new polymer dispersion was synthesized by using
relatively hydrophilic polyols. This polymer was prepared from polycaprolactone
diol (Capa 225), toluene diisocyanate (TDI), 1,4-butane diol (BDO) as chain
extender, and dibutyltin dilaurate catalyst. Grafted polyurethane was prepared with chlorinated
poly(ethylene glycol monomethyl ether) (PEGMME) in the presence of sodium
hydride (NaH). Chlorinated PEGMME was also prepared by reaction of PEGMME with
thionyl chloride in dried toluene. FTIR and 1H NMR of the waterborne polyurethanes were
used to characterize the grafted PU. The effects of various molecular weights of PEGMME
as non-ionic hydrophilic segments were studied. The particle size and viscosity of
dispersions were systematically analyzed. It is found that by increasing the molecular
weight of the grafted PEGMME, the particle size of dispersed polyurethane is decreased,
and viscosity is increased.
