Preparation and Packaging Properties of Poly(butylene adipate terephthalate)/ Poly(L-lactic acid)/Nano Silicon Dioxide Blend Films

Poly (butylene adipate terephthalate)/poly(L-lactic acid)/silicon dioxide (PBAT/PLLA/SiO2) blended films with different types of (hydrophilic and hydrophobic) nano-SiO2 were prepared by the melt blending method through a twin- screw extruder. The effect of nano- SiO2 on the thermal, mechanical and barrier properties of the blended films were analyzed. The results show that with the addition of nano- SiO2, the Tc and ∆ Hc of the PBAT component in the blend systems are increased, indicating that the addition of SiO2 promotes the crystallization of the PBAT component, and the addition of SiO2 can increase Xc of the both PBAT and PLLA components. With the addition of nano-SiO2, the elastic modulus and tensile strength of the oriented stretch direction of the blended films are increased, and the overall mechanical properties of the oriented blended film are improved. The best barrier per- formance is shown when the additive amount is 0.5%. The comparison between the two types of SiO2 show that the gas barrier performance of the hydrophilic SiO2 blend film is better than that of the hydrophobic SiO2 blend film, and the hydrophobic group shows better water vapor barrier performance than the hydrophilic group. © 2022, Editorial Board of Polymer Materials Science & Engineering. All right reserved.