Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 171, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.indcrop.2021.113916
Keywords
Lignin; Thermoplastic starch; PBAT; Thermal analysis; Mechanical properties
Categories
Funding
- Program for National Key Research and Development Program of China [2019YFD1101202]
- National Natural Science Foundation of China [21776132, 22008119]
- Jiangsu Province Natural Science Foundation for Distinguished Young Scholars [BK20190035]
- Natural Science Foundation of the Jiangsu Higher Education Institutions [19KJB530002]
- Six Talent Peaks Project in Jiangsu Province [SWYY-045]
- Project of Jiangsu Synergetic Innovation Center for Advanced Bio-Manufacture
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This study found that lignin has a compatibilization effect on PBAT and TPS, improving thermal stability, mechanical properties, and interfacial compatibility of the composites. Furthermore, lignin enhances hydrophobicity and water repelling ability of the composites, which is beneficial for prolonged mechanical properties and shelf life.
This study prepared ternary composites PBAT/thermoplastic starch (TPS)/lignin containing 20, 30 and 40 wt% of TPS/lignin fillers via thermal compounding, and found that lignin imposes compatibilization effect on PBAT and TPS. Thermal analysis shows that the incorporation of lignin results in higher thermal stability, reduced crystallization temperatures, broader crystallization exotherms and increased Tg due to the rigid aromatic structure of lignin. Tensile tests exhibit that strain at break and tensile strength reaches a maximum at loading 10 wt% of lignin. The reinforcement of lignin is reflected as the enhanced elastic modulus, Shore-D hardness, and more prominent yielding behavior of the composites. Rheological and microscope measurements show that the incorporation of lignin leads to higher approximation to theoretical Han curve, and reduced TPS particle size in the composites, indicating that lignin improves the interfacial compatibility between the PBAT and TPS phases. Contact angle and water absorption results demonstrate that lignin improves the hydrophobicity and water repelling ability of the composites, which are favorable for products with prolonged mechanical properties and shelf life.
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