Journal
CHEMICAL ENGINEERING JOURNAL
Volume 469, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.143935
Keywords
Vanillin; Porphyrin; Polylactic acid; Toughness; UV -resistance; Self -extinguishing
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A vanillin-based porphyrin (VPR) was synthesized and added to polylactic acid (PLA) to enhance its mechanical, anti-UV, and flame retardant properties. The PLA/VPR biocomposites showed significant toughening effect due to the intermolecular interactions between VPR and PLA. With only 3 wt% VPR loading, the PLA/3VPR composite achieved excellent self-extinguishing with a UL-94 V-0 level.
To achieve high-performance polylactic acid (PLA) composites, the exploitation of multifunctional biomass additives derived from renewable resources are highly demanded. Herein, a vanillin-based porphyrin (VPR) was designed and synthesized to impart PLA with enhanced mechanical, anti-UV, and flame retardant properties. Multiple intermolecular interactions between VPR and PLA enabled significant toughening of the PLA/VPR biocomposites compared to PLA itself. The elongation at break and impact strength for PLA/3VPR were improved by 88.2 % and 104.2 %, respectively, without influence on their tensile strength. Furthermore, the PLA/VPR biocomposites exhibited improved anti-UV performance with only 1.5 % and 8.6 % decrease of the strength and elongation at break respectively after UV aging. More importantly, incorporation of only 3 wt% VPR loading within the PLA/3VPR composite allowed for excellent self-extinguishing with a UL-94 V-0 level, greatly improving the versatility of PLA composites. We envision that such bio-based PLA/VPR materials with multifunctional features will extensively broaden the usable range of PLA composites.
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