PBAT/PBAT-GMA/PLA生物降解薄膜的制备及性能研究OA

Poly(adipate-butylene terephthalate)(PBAT)was grafted with glycidyl methacrylate(GMA)to prepare PBAT-GMA,which was subsequently blended with PBAT and poly(lactic acid)(PLA)to obtain PBAT/PBAT-GMA/PLA blends.The effects of PBAT-GMA content on the mechanical properties,micromorphology,barrier properties,and degradability of PBAT/PBAT-GMA/PLA films were systematically studied.The results indicate that increasing the mass fraction of PBAT-GMA significantly enhanced the mechanical properties of the films.When the mass fraction of PBAT-GMA is 15%,the tensile strength increased from 15.28 MPa(longitudinal)and 12.51 MPa(transverse)without PBAT-GMA to 25.61 MPa(longitudinal)and 19.59 MPa(transverse),respectively.Similarly,the elongation at break improved from 109.23%(longitudinal)and 141.32%(transverse)to 217.63%(longitudinal)and 311.22%(transverse).It demonstrates that the incorporation of PBAT-GMA effectively enhanced the compatibility between PBAT and PLA,thereby improving the mechanical properties of the blend.Moreover,with higher PBAT-GMA content,the barrier properties of PBAT/PBAT-GMA/PLA films were also significantly improved.However,the degradation rate of PBAT/PBAT-GMA/PLA films decreased slightly with the increase of PBAT-GMA mass fraction,indicating that the durability of the materials was improved.