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Study on Physical Aging Properties of Lignin-based Polylactic Acid Composite Films
Received:January 11, 2023  
DOI：10.11980/j.issn.0254-508X.2023.07.004
Key Words:lignin  esterification reaction  polylactic acid  toughening  crystallinity degree  physical aging
Fund Project:国家自然科学基金项目（32171694）。
Author NameAffiliationPostcode
HUANG Junya* Key Lab of Bio-based Material Science and Technology of Ministry of Education， Northeast Forestry University， Harbin， Heilongjiang Province， 150040 150040
FAN Xinyan Key Lab of Bio-based Material Science and Technology of Ministry of Education， Northeast Forestry University， Harbin， Heilongjiang Province， 150040 150040
WANG Yonggui Key Lab of Bio-based Material Science and Technology of Ministry of Education， Northeast Forestry University， Harbin， Heilongjiang Province， 150040 150040
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Abstract:Three kinds of lignin esters （LEs） based on octyl chloride， dodecyl chloride and stearyl chloride were synthesized for the compound toughening modification of polylactic acid （PLA）. LEs/PLA composite films were prepared by solvent casting method. The effects of different types and dosages of LEs on the changes of mechanical properties of LEs/PLA composite films during the physical aging process were systematically studied. The results showed that the extension of physical aging time could significantly reduce the elongation at break and improve the tensile strength of the composite film. However， the elongation at break of the composite film with LEs added was still higher than that of pure PLA after aging. The elongation at break of the composite film with LE18 added with a mass fraction of 10% after 84 days of physical aging was still 30.7%， which was 6.27 times of that of pure PLA under the same condition， and the tensile strength was 42.1 MPa.
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