Enhancing durability of Poly(lactic acid) composites by nucleated modification

Biodegradable poly (lactic acid) (PLA) composites were prepared using an innovative combination of wood fiber (WF) and 1,3,2,4?Bis (3,4?Dimethylobenzylideno) Sorbitol (DMDBS). DMDBS acted as an effective nucleating agent, which improved the mechanical properties and slowed down the degradation of wood fiber (WF) /Poly (lactic acid) (PLA) composites. The enzymatic degradation of composites was examined by immersing in proteinase K or cellulase buffers respectively. The presence of DMDBS resulted 26.7% increase of the crystallinity compared to WF/PLA composites. The increase in crystallinity enhanced thermal stability and tensile strength of the WF/PLA/DMDBS composites by 8.5%. The durability of WF/PLA/DMDBS composites after nucleated modification was enhanced after enzymolysis. After nucleated modification, the surface of WF/PLA composites showed evident cracks due to degradation, while appeared about two weeks later in the case of WF/PLA/DMDBS composites. The results revealed that the introduction of cellulase degraded wood fibers in the composites, which increased hydrolysis or enzymolysis sites of the composites. The combination of nucleated modification and enzyme buffers gave an expanded downstream application of WF/PLA composites in packaging and agricultural materials.This article is protected by copyright. All rights reserved.

» Author: Ce Sun, Changxin Li, Haiyan Tan, Yanhua Zhang

» Reference: doi:10.1002/pi.5837

» Publication Date: 04/05/2019

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This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement Nº 737882.


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