In this paper, a series of polyurethane elastomer with different structure were synthesized using liquefaction modified MDI> HTPB and PLA-OH as materials. The effect of PLA-OH with different content and molecular weight, the ratio of NCO/OH, crosslinker concentration and the molecular weight of HTPB on the mechanical properties, and thermal stability were investigated by tensile test, hardness test, thermogravimetry (TG), differential scanning calorimetry (DSC) and scanning electron microscope (SEM). In add...