Tensile properties of poly(β-hydroxybutyrate)/poly(ethylene oxide)(PHB/PEO) blends were reported in this paper.It was found that the blends of PHB with different molecular-weight PEO exhibited different mechanical properties.The mechanical properties of the blends of PHB and PEO3(Mw=0.3×106) were very poor.However
the blends of PHB and PEO5(Mw=5×106) showed compatible in mechanical properties.Excellent synergism was observed not only in tensile stress and tensile elongation but also in modulus.Moreover
the ductility of the blends could be improved further under proper heat-treatmen.