Abstract:

A series of poly（glycolic acid） （PGA）/poly（butylene adipate-co-terephthalate） （PBAT） compounds at different mass rations were prepared by melt blending， and their heat resistance， mechanical properties and barrier properties were characterized. The results indicated that when the PGA/PBAT mass ratio was set to 80/20， the compounds achieved the tensile strength of 68.8 MPa， elongation at break of 72.15 %， impact strength of 16 kJ/m²， and the load thermal deformation temperature of 120 °C. These results suggested that the compound could be used to produce disposable tableware. When the PGA/PBA mass ratio was set to 20/80， the blown films processed by the compounds achieved the vertical and horizontal tensile strength of above 25 MPa and elongation at break of above 600 %. This indicated that the compounds could be used to produce film bag products. In addition， with the increase of PGA content， the compound exhibited a gradual increase in water barrier properties. For the compound at the PGA/PBAT mass ratio of 20/80， its water vapor transmission rate was just 1/7 of the value of pure PBAT films.

Key words: poly（glycolic acid）, poly（terephthalic acid-butanediol adipate）, heat resistance, mechanical property, barrier property