Study on preparation of poly(butylene adipate-co-terephthalate)/polylactic acid degradable composites and their performance
PBAT/PLA composites were prepared by twin-screw melt blending using poly(butylene adipate-co-terephthalate)(PBAT)as the raw material with the addition of different amounts of polylactic acid(PLA).The chemical functional groups,melting and crystallinity of the material before and after compositing were analyzed and investigated by Fourier transform infrared spectrometer,differential scanning calorimeter and thermogravimetric analyzer,respectively.The composites with different raw material ratios were ultimately made into long strip shaped splines by injection molding,and the tensile strength tests were carried out under rated tensile strain conditions.The results showed that the crystallinity of pure PBAT was poor,after adding PLA and compatibilizer ADR4370S,the crystallinity of PBAT/PLA composites was improved,and a clear crystallization peak appeared at reduced temperature;the tensile strength of PBAT/PLA composites increased significantly with the increase of the addition of PLA,the tensile strength of pure PBAT splines was only 11.456 MPa,and when m(PLA):m(PBAT+PLA)was 20％,the tensile strength of PBAT/PLA composites could achieve 15.491 MPa,which was 35％higher than that of pure PBAT splines.
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