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Fiber-reinforced biocomposites were widely considered as the optimal sustainable alternative to traditional petroleum-based polymers due to their renewable, degradable, and environmentally friendly characteristics, along with economic benefits. However, the poor interfacial bonding between the matrix and natural fiber reinforcement remained a key issue limiting their mechanical and thermal properties. Focusing on cost-effective, convenient, and low-pollution chemical methods, this work proposed a strategy for in-situ synthesis of composite structures on bamboo fiber (BF) surfaces. Crude chitosan (CS) and reclaimed tannic acid (TA) were utilized as the raw materials, to construct stereo-netlike chitosan @ tannin structures (CS@TA) via a one-pot method facilitated by hydrogen bonding and complexation. The influence of reactant concentration and pH value on the process was further investigated and optimized. The CS@TA structure improved the interfacial bonding between the BF reinforcement and matrix poly(3-hydroxybutyrate) (PHB), and this non-amino-driven construction provided a potential reaction platform for functionalizing the interfacial layer. The modified biocomposite showed improvements in tensile and impact strengths (51.58 %, 41.18 %), also in tensile and flexural moduli (13.59 %, 26.88 %). Enhancements were also observed in thermal properties and heat capacity. This work presents a simple and promising approach to increase biocomposite interface bonding., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)

Natural plant fiber-reinforced bio-based polymer composites are widely attracting attention because of their economical, readily available, low carbon, and biodegradable, and showing promise in gradually replacing petroleum-based composites. Nevertheless, the fragile interfacial bonding between fiber and substrate hinders the progression of low-cost and abundant sustainable high-performance biocomposites. In this paper, a novel high-performance sustainable biocomposite was built by introducing a high density strong hydrogen-bonded bridging interface based on tannic acid (TA) between bamboo fibers (BFs) and PBSA. Through comprehensive analysis, this strategy endowed the biocomposites with better mechanical properties, thermal stability, dynamic thermo-mechanical properties and water resistance. The optimum performance of the composites was achieved when the TA concentration was 2 g/L. Tensile strength as well as modulus, flexural strength as well as modulus, and impact strength improved by 22 %, 10 %, 15 %, 35 %, and 25 % respectively. Additionally, the initial degradation temperature(T onset ) and maximum degradation temperature(T max ) increased by 12.07 °C and 14.8 °C respectively. The maximum storage modulus(E'), room temperature E', and loss modulus(E")elevated by 199 %, 75 %, and 181 % respectively. Moreover, the water absorption rate decreased by 59 %. The strong hydrogen-bonded bridging interface serves as a novel model and theory for biocomposite interface engineering. At the same time, it offers a promising future for the development of high performance sustainable biocomposites with low cost and abundant biomass resources and contributes to their wide application in aerospace, automotive, biomedical and other field., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)

Increasing the content of reactive oxygen species (ROS) with the assistance of nanoformulations in cancer cells via the Fenton reaction is considered an effective method to treat cancer. However, the efficiency of the Fenton reaction is affected by the level of H2O2, the selection of iron ions in different nanoformulations, etc. Herein, we use FeIII-tannic acid (FeIIITA) nanocomposites as the carrier to deliver glucose oxidase (GOD) which can solve the problem of insufficient endogenous H2O2 by catalytically converting the glucose. In comparison with traditional Fe2+/Fe3+, FeIIITA nanocomposites perform higher catalytic activity in converting H2O2 to high toxic hydroxyl radicals (·OH) due to the TA-mediated reduction of Fe3+. So, the integration of GOD and TA in the construction of nanocomposites significantly enhances the efficiency of the Fenton reaction. In vitro experiments show that ·OH produced by GOD-FeIIITA nanocomposites can not only achieve a good anticancer effect at a low concentration but also promote degradability of the nanocomposites. When it is only 1.08 μg · ml−1, the cell apoptosis rate has reached 76.91%. In vivo experiments further demonstrate that GOD-FeIIITA nanocomposites can significantly inhibit tumor growth. So this work lays a good foundation for Fenton reaction-based cancer treatment. [ABSTRACT FROM AUTHOR]

Natural plant fiber-reinforced biopolymer composites are attractive for their renewable, degradable, and low-carbon, compare to petroleum-based composites. However, the poor interfacial compatibility of bio-composites between fibers and matrix has long been recognized as the biggest challenge. Surface modification of natural fibers or polymers is considered the most common method to address this issue, which is always high energy consumption, and high pollution. Hence, we focus on cleaner and more economical solutions to overcome this difficulty. We pioneered the introduction of a novelty coordination-driven interface system into fibers-filled bio-composites. The chief object of this study is to investigate the iron ions (Fe3+) coordination drives the tannic acid (TA) interface and how to enhance composite interfacial compatibility and promote bio-composite properties. The way of interface formation is cleaner, simpler, more energy efficient, and effective, and the performance of biocomposites has been enhanced, including mechanical (tensile strength, flexural strength, and impact strength increased by 21.65%, 19.41%, and 52.24% respectively. The flexural strength and modulus even reached 59.65 MPa and 6.61 GPa), thermal (T onset and T max increased from 267.39 °C, 377.76 °C–290.13 °C, 389.24 °C, respectively), crystallization (Crystallinity increased by 52.35%) and hydrophobic performance. To summarize, the coordination-driven interfacial system proposes a simple and workable structural model in the field of natural plant fiber-reinforced biopolymer composites interface. [Display omitted] • The Fe3+ coordination-driven tannic acid interfacial system is introduced in fiber-reinforced polymer composites for the first time. • The amount of bamboo fiber filling is raised to 50%. • Better mechanical properties, thermal stability, crystalline properties， and hydrophobic properties are obtained by this strategy. • All the materials are non-toxic, sustainable, low-cost, abundant, and eco-friendly, and the experimental method is simple and mild. • The strategy shows great potential in cleaner production. [ABSTRACT FROM AUTHOR]