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Lignin-Based Composite Film and Its Application for Agricultural Mulching
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This review examines lignin-based composite films as biodegradable alternatives to conventional polyethylene agricultural mulch, summarizing recent advances in lignin types, film preparation methods, and field applications, with the conclusion that lignin-based mulches offer a promising green solution to agricultural plastic pollution.
Agricultural mulching is an important input for modern agricultural production and plays an important role in guaranteeing food security worldwide. At present, polyethylene (PE) mulching is still commonly used in agricultural production in most countries around the world, which is non-biodegradable, and years of mulching have caused serious agricultural white pollution. Lignin is one of the three major components of plant cell walls, and it is also the main renewable natural aromatic compounds in nature. Lignin-based composite film materials are green, biodegradable, and show good prospects for development in the field of agricultural mulch. This paper introduces the types, structure, and application status of lignin, summarizes the preparation of lignin-based composite film materials and its latest research progress, focuses on the types, preparation methods, and application examples of lignin-based agricultural mulching, and looks forward to the future development prospects of lignin-based agricultural mulching.
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A Comprehensive Review on Lignin-Based Biodegradable Mulch Films for Sustainable Agriculture
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The plastic sheeting farmers use to boost crop yields is leaving behind massive amounts of microplastics in soil — up to 10,000+ particles per kilogram — which can harm soil health and potentially work their way into our food and water. This review rounds up existing research on a promising fix: mulch films made from lignin, a natural, plant-based material that blocks UV light, resists water, and breaks down in soil within weeks instead of persisting like plastic. While these lignin-based films show real potential, the review notes more work is needed before they're ready for widespread farm use.
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Researchers developed an all-biodegradable mulch film made from soy protein, lignin, and oxidized sucrose as a green alternative to conventional plastic agricultural films. The film demonstrated improved tensile strength, UV-shielding capability, moisture retention, and controlled fertilizer release properties. Field tests showed higher cabbage seed germination rates compared to traditional polyethylene film, suggesting this bio-based material could reduce microplastic generation from agricultural practices.
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Recent Advances in the Application of Lignin for Biobased Packaging Materials
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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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