Characterization of hyperbranched polyurethane synthesized with glycerin and aromaticity unit

Toluene-2, 4-diisocyanate(TDI) and glycerin(GCR) as the reactants, the active substrates with AB₂ structure was synthesized at low temperature, and then hyperbranched polyurethane(HBPU) was synthesized after heat and catalyze those substrates. The HBPU properties are that the molecule weight is 1.1368×10⁴, the degree of branching is 0.4, the glass state transforming temperature is 111 °C. The melt point of HBPU transformed with stearic acid(HBPU-SA) is 55.1 °C. After mixing HBPU-SA with linetype polyurethane (polymerized with TDI and N220) and becoming mixed polymer, the tensile strength and elongation of the mixed polymer come up to maximums as the concentration of HBPU-SA is 15%, and the two maximums are 3.4 and 3.2 time of blank sample - linetype polyurethane, respectively.