The effect of ionic liquid content on the structure and properties of PLA/PBAT composite membranes was studied using polylactic acid(PLA)as the matrix,poly(butylene adipate-butylene terephthalate)(PBAT)as the toughening agent,and 1-hexadecyl-3-methylimidazolium bis(trifluoromethanesulfonyl)salt ionic liquid(IL)as the modifier.Dynamic thermomechanical analysis(DMA)testing found that after the addition of IL,the storage modulus of PLA/PBAT composite film decreased,and the glass transition temperature of PLA and PBAT shifted towards low temperature,demonstrating the plasticizing effect of IL.The results of scanning electron microscopy(SEM)showed that the addition of a small amount of IL reduced the phase size of PBAT in the PLA matrix,resulting in more uniform particle dispersion,demonstrating the compatibilization effect of IL.As the IL content increased,the cold crystallization temperature of PLA gradually shifted towards low temperature,and the plasticizing effect of IL led to an increase in the crystallinity of PLA phase.The dual effects of IL compatibilization and plasticization improved the tensile properties of PLA/PBAT composite films.When the IL content was 0.5％,the elongation at break,tensile strength,and modulus of PLA/PBAT/IL composite film were 295％,55.0 MPa,and 1 800 MPa,which were 19.7,1.45,and 1.03 times higher than those of PLA/PBAT composite film,respectively.Therefore,IL significantly improved the performances of PLA/PBAT composite membranes.
维普
万方数据