To solve the problem of low tensile strength of poly(butylene adipate-co-terephthalate)(PBAT),polylactic acid(PLA)-reinforced PBAT composites were prepared by melt blending.The effects of PLA content on the tensile properties,microphase structure,thermodynamic properties and chemical constitution of PBAT were studied.After the addition of polyethylene glycol 400(PEG400),the composite materials were prepared into films,and the tensile properties and micro morphology of the films were further studied.The results showed that with the increase of PLA content,the tensile strength of PBAT/PLA/CaCO3 composites increased firstly and then decreased,and the elongation at break decreased.Although the addition of PEG400 reduced the tensile strength of PBAT/PLA/CaCO3 composites to a certain extent,it improved the compatibility between PBAT and PLA,so the elongation at break of the composites could be enhanced significantly.According to the experimental results,compared with pure PBAT,when PLA content was 10％,the tensile strength and elongation at break of PBAT/PLA/CaCO3/PEG400 composites were increased by 9.43％and 6.94％,respectively,widely expanding their application range.
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