Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 108, Issue -, Pages 775-781Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2017.10.168
Keywords
Lignin; Selective aminolysis; Polypropylene
Funding
- foundation of Science Research Program from Hubei Provincial Department of Education [Q20171602]
- Opening Project of State Key Laboratory of Polymer Materials Engineering (Sichuan University) [sklpme2017-4-14]
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Even with outstanding radical capturing ability, the utilization of lignin as a natural antioxidant in polypropylene (PP) still has been pended. Usually, the compatibility of its blends is improved based on the reaction of hydroxyl content, thus leading to the decreasing content of phenolic hydroxyl (Ph-OH) group and inferior thermal-oxidative stability of lignin blends. Here, the selective aminolysis of acetylated Kraft lignin (pyr-KL) was investigated, which structures were characterized using FTIR, P-31-NMR and GPC. The Ph-OH group of acetylated KL could be released by the addition of pyrrolidine; however the aliphatic hydroxyl group is still blocked. With the control of reaction conditions, the highest oxidation induction time of pyr-KL/PP (0.5 wt% loading) reaches up to 22.6 min, almost 2.6 times than that of pure PP. More importantly, the mechanical properties of PP were also maintained under the loading of pyr-KL, which is much better than that of curde KL/PP. (C) 2017 Elsevier B.V. All rights reserved.
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