Poly(lactic acid)/poly(acrylic acid) blends (PLA/PAA) were prepared by melt blending.The hydrogen-bonding between PLA and PAA was analyzed by Fourier transform infrared spectroscopy (FTIR).The rheological properties

thermal behaviors and the stability of PLA/PAA blends were also investigated by dynamical rheological test

differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA).The FTIR results indicated that the hydrogen-bonding interaction was existed in PLA/PAA blends between the oxygen atom of carbonyl (C＝O) on PLA and the hydrogen atom of carboxyl acid groups (COOH) on PAA.The rheological behaviors and cold-crystallization behaviors of PLA/PAA blends were changed with the contents of PAA

because the formation of the hydrogen-bonding in PLA/PAA blends was influenced by the contents of PAA.Meanwhile

the hydrogen-bonding networks were also affected by the heating history that the blends underwent.When the content of PAA was lower than 5 wt%

PLA and PAA was partially miscible

which was favorable to the formation of hydrogen-bonding networks between PAA and PLA chains.And the formed hydrogen-bonding networks can partially decrease the effect of plastification of PAA on the viscosity of the blends.However

when the content of PAA was greater than 5 wt%

the phase separation of melt PAA and PLA became serious

which counteracted the formation of hydrogen-bonding.