Journal
CARBOHYDRATE POLYMERS
Volume 230, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2019.115626
Keywords
Bark; Thermoplastic starch; Lignin containing cellulose nanofibril; Mechanical property; Thermal stability; Water barrier
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Ontario-China Research and Innovation Fund (OCRIF)
- National Natural Science Foundation of China [51775318]
- China Scholarship Council
- Program for Outstanding PhD candidate of Shandong University
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Lignin containing cellulose nanofibrils (LCNF) were obtained by mechanically fibrillating unbleached tree bark after alkaline extraction and used as a reinforcement in thermoplastic starch (TPS) to develop novel biodegradable composite films. With the addition of 15 wt % LCNF, the tensile strength and modulus of the composites increased by 319 % and 800 % compared to neat TPS films, respectively. The crystalline property of cellulose and the high interaction between TPS and LCNF improved the mechanical property of the composite films. The composite film T-onset and T-max were 263.1 degrees C and 316.5 degrees C, respectively, compared to 250.5 degrees C and 297.3 degrees C for neat TPS. The composite films also showed higher water barrier property. Experimental results showed that LCNF features a high lignin content. Lignin, a natural polymer, contains hydrophobic and aromatic groups and, thus, can increase the water barrier property and thermal stability of TPS/LCNF composite films.
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