The influences of activation temperature on the structure and properties of aqueous polyurethane (APU) films were studied by means of FTIR

DSC and SEM.The testing results showed that when the film of APU is treated at a higher temperature

the chain segment motion can take place easily which leads to the rearrangement of the molecular chains.Furthermore

disordered hydrogen-bond intensity of APU films increased obviously and ordered hydrogen-bond intensity increased lightly during this process

which leads to non-perfect long-range ordered structure and a little perfection.The ordered structure in APU films formed effective physical cross-link point

which is conducive to better physical properties of APU films.