PGA/PBAT复合材料的性能及应用研究

采用熔融共混法制备了一系列不同组分含量的聚乙醇酸（PGA）/聚对苯二甲酸-己二酸丁二醇酯（PBAT）复合材料，对复合材料的耐热性能、力学性能和水气阻隔性能进行了表征。结果表明，当PGA含量为80 %（质量分数，下同）时，注塑样条的拉伸强度为68.80 MPa、断裂伸长率为72.15 %、冲击强度为16.00 kJ/m²、负荷变形温度为120 °C，表明该复合材料可用于制备一次性餐具；当PGA含量为20 %时，吹塑薄膜的纵横向拉伸强度均在25 MPa以上，纵横向断裂伸长率均在600 %以上，表明该复合材料可用于生产膜袋产品；此外，随着PGA含量的增加，PGA/PBAT材料的水气阻隔性能也逐渐增加，其中含20 %PGA的PGA/PBAT复合膜的水蒸气透过率为纯PBAT薄膜的1/7。

Properties and Applications of PGA/PBAT Composites

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.