Biodegradable blends of poly(butylene adipate-co-terephthalate) and stereocomplex polylactide with enhanced rheological, mechanical properties and thermal resistance

The aim of this study was to prepare a new blend system by blending equimolar poly(L-lactic acid) (PLLA) and poly(D-lactide acid) (PDLA) with poly(butylene adipate- co -terephthalate) (PBAT) and to form stereocomplex polylactide (sc-PLA) during blending process. Then, sc-PLA would improve the perfor...

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Bibliographic Details
Published in:Colloid and polymer science 2020-05, Vol.298 (4-5), p.463-475
Main Authors: Li, Yi, Zhao, Lijia, Han, Changyu, Yu, Yancun
Format: Article
Language:English
Subjects:
Biodegradability
Biodegradable materials
Blending
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Elongation
Food Science
Heat resistance
Mechanical properties
Mixtures
Morphology
Nanotechnology and Microengineering
Original Contribution
Percolation
Performance enhancement
Physical Chemistry
Polylactic acid
Polymer Sciences
Rheological properties
Rheology
Soft and Granular Matter
Tensile strength
Terephthalate
Thermal resistance
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Summary:The aim of this study was to prepare a new blend system by blending equimolar poly(L-lactic acid) (PLLA) and poly(D-lactide acid) (PDLA) with poly(butylene adipate- co -terephthalate) (PBAT) and to form stereocomplex polylactide (sc-PLA) during blending process. Then, sc-PLA would improve the performance of PBAT without compromising its biodegradability. Torque-time curve, differential scanning calorimetry (DSC), and wide angle X-ray diffraction (WAXD) measurements indicated that only sc-PLA formed in PBAT matrix. The phase morphology showed that sc-PLA particles were uniformly dispersed in PBAT matrix, and the sizes were independent of their contents. The rheological properties of PBAT were significantly enhanced by addition of sc-PLA, especially after the formation of a percolation network structure. With the increase of sc-PLA content, the blends displayed increased yield strength and modulus and decreased elongation at break and tensile strength. The sc-PLA particles could reinforce PBAT matrix. Compared with pure PBAT, the heat resistance of PBAT/sc-PLA blends was improved. Graphical abstract
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-020-04636-1