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Depleting fossil fuels and environmental concerns have emphasized the necessity for more sustainable resources for high-performance structural applications. High strength, lightweight, and abundant bioresources make cellulose long filaments (CLFs) an excellent reinforcement for high-performance structural applications. At the same time, high strength and thermally stable vanillin epoxy can efficiently replace petroleum-based epoxies. This study introduces the combination of unidirectional CLFs and vanillin epoxy by using vacuum-assisted resin transfer molding for novel biobased composites. Owing to the low density of CLFs, the proposed composite material possessed very low density, high specific flexural strength, and excellent thermal and hydrophobic properties. The FTIR analysis demonstrated good interfacial adhesion between CLFs and vanillin epoxy. The sustainable resources, hydrophobicity, and good mechanical performance make unidirectional CLFs reinforced Vanillin epoxy composite an excellent candidate for high-performance structural applications.
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