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Designing a Dynamic Material via Interlocking Kraft Lignin with Ultrahigh Molecular Weight Poly(ethylene oxide)
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Researchers created a dynamic polymer material by physically interlocking kraft lignin — an abundant wood pulping byproduct — with ultra-high molecular weight polyethylene oxide, producing a renewable, mechanically tough material that can be reprocessed, offering a sustainable alternative to petroleum-based plastics.
The environmental issues stemming from plastic waste and the excessive use of petroleum-based chemicals are both concerning and urgent. To effectively address this problem, we need to adopt a comprehensive approach involving developing more sustainable and renewable materials. These materials should be capable of demonstrating similar or even better performance than functional polymers synthesized from petroleum-based chemicals. Our research aims to develop more sustainable materials by leveraging the intrinsic characteristics of a natural polymer, lignin, a byproduct of the biorefinery industries. We utilized the three-dimensional branching structure of lignin as a material framework. We employed an approach to coreactive melt processing of kraft lignin with aliphatic flexible chains of soft cross-linkers through the reaction of the cross-linker epoxy chain ends with lignin functional groups. Our study demonstrates that the interlocked structure formed from the coblending of kraft lignin with ultrahigh molecular weight poly(ethylene oxide) and the cross-linking of lignin chains through a solvent-free process can manipulate the macromolecular interactions and relaxation. This manipulation results in materials that exhibit a wide range of thermomechanical properties and self-healing and shape memory effects, with drastically improved stiffness in a single material. We have explored the fundamental understanding of the macromolecular chain relaxation dynamics originating from the interlocking structure formation. This investigation utilized various techniques, including thermal, mechanical, rheology, and quasi-elastic neutron scattering.
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Recent advances in lignin-based packaging materials demonstrate that incorporating technical lignin and lignin nanoparticles into biopolymer matrices (PLA, PBAT, starch) improves mechanical strength, thermal stability, UV shielding, and antioxidant properties. Chemical functionalization strategies like esterification and epoxidation enhance compatibility and unlock advanced properties such as self-healing, positioning lignin as a high-value additive for sustainable bio-based packaging.
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Researchers reviewed how lignin nanoparticles can enhance biodegradable food packaging polymers like chitosan and starch, finding that lignin's natural antioxidant and antimicrobial properties significantly improve barrier performance and shelf life while reducing reliance on petroleum-based plastics.
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Researchers developed high-performance biodegradable poly(lactic acid) composites by incorporating xylan and lignin derived from lignocellulosic biomass, improving PLA mechanical properties and addressing its brittleness limitations while maintaining biodegradability as a sustainable alternative to conventional plastics.
Adsorbing nanoplastics through high-resilience lignin–polyurethane foam
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Researchers developed a lignin-infused polyurethane foam that removes nanoplastics from water using two mechanisms: physical trapping in the foam's pores and chemical bonding between the plastic particles and lignin's molecular structure. This offers a promising, plant-derived approach to filtering tiny plastic particles from contaminated water. As nanoplastics are increasingly found in drinking water sources and human tissue, materials that can capture them efficiently are an important part of the solution.
Experimental Investigation of a Lignin-based Adhesive Layer for Biodegradable Composite Material Made With Wood Veneer and Hemp Fabric
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Scientists created a wood-and-fabric material called "flexwood," glued together using lignin (a natural wood substance) instead of typical plastic-based glues. This bio-based glue performed just as well—actually holding up better against tearing—and the material fully broke down in soil within about seven months, unlike synthetic composites that didn't degrade at all. This matters because everyday products like car interiors and furniture often rely on plastic adhesives that shed microplastics and never disappear from the environment; swapping in a plant-based alternative could cut down on that pollution while still making sturdy, long-lasting materials.
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