Valorization of enzymatic hydrolysis lignin for the multifunctional stabilization of polypropylene

Industrial Crops and Products(2022)

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摘要
Environmental toxicity of conventional stabilizers for polymers and their degradation products is raising severe concerns. There is an urgent need for the development of environmental-friendly, high-efficiency, and multifunctional stabilizers for polymers. Herein, Lignin nanoparticles (LNP), which were produced from enzymatic hydrolysis lignin (EHL) isolated from corncob residue, were demonstrated as a multifunctional stabilizer for polypropylene (PP). LNP fabricated by the anti-solvent method has distinct surface properties from the raw EHL, which lends it a better dispersion state in PP, and a higher free radical scavenging and UV absorption ability. The addition of 1 wt% LNP significantly enhances the thermo- and photo-oxidation stability of PP. The oxidation induction time of PP increases from 6.1 min to 12.3 min by 102 % with the addition of 1 wt% EHL, while it further increases to 20.1 min by 230 % for PP/LNP. Compared with PP, the oxidation degree of PP/EHL during thermo-oxidation for 8d is reduced by 27 % while that of PP/LNP is reduced by 60%. In addition, the UV degradation diffusion from the surface to the inner part of PP/LNP is significantly suppressed. These results highlight the excellent stabilization effects of LNP on PP and provide a promising path for the high-value-added lignin.
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关键词
Lignin nanoparticles,Stabilizer,Polypropylene,Antisolvent method
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