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<p>The development of fluorine-free and sustainable hydrophobic coatings remains a critical challenge. In this work, Kraft lignin was chemically modified through carboxylation followed by octadecylamine (ODA) grafting to yield a hydrophobic derivative (CLODA). Structural analyses by Fourier transform infrared and X-ray photoelectron spectroscopy techniques confirmed successful modification, while lignin’s inherent UV-blocking and antioxidant properties were retained. Spray-coated CLODA dispersions generated superhydrophobic surfaces with water contact angles exceeding 150°, demonstrating excellent adhesion across diverse substrates, including plastic, glass, filter paper, hardwood, and softwood. When applied to poly(vinyl alcohol) (PVA) films, CLODA markedly enhanced water resistance while simultaneously imparting UV-protective and antioxidant functionalities. These improvements effectively address the intrinsic limitations of PVA films, expanding their potential for sustainable, multifunctional packaging. Overall, CLODA coatings combine hydrophobicity with bioactive properties, offering a promising route toward environmentally friendly, high-performance packaging materials.</p>

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Sustainable lignin-derived hydrophobic coatings with enhanced UV-blocking and antioxidant properties for packaging materials

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Rajkumar Bandi,
  • Ramakrishna Dadigala,
  • Ju-Won Jin,
  • Seung-Woo Cho,
  • Hae-Chan Moon,
  • Dong-Suk Jeon,
  • Song-Yi Han,
  • Gu‑Joong Kwon,
  • Seung-Hwan Lee

摘要

The development of fluorine-free and sustainable hydrophobic coatings remains a critical challenge. In this work, Kraft lignin was chemically modified through carboxylation followed by octadecylamine (ODA) grafting to yield a hydrophobic derivative (CLODA). Structural analyses by Fourier transform infrared and X-ray photoelectron spectroscopy techniques confirmed successful modification, while lignin’s inherent UV-blocking and antioxidant properties were retained. Spray-coated CLODA dispersions generated superhydrophobic surfaces with water contact angles exceeding 150°, demonstrating excellent adhesion across diverse substrates, including plastic, glass, filter paper, hardwood, and softwood. When applied to poly(vinyl alcohol) (PVA) films, CLODA markedly enhanced water resistance while simultaneously imparting UV-protective and antioxidant functionalities. These improvements effectively address the intrinsic limitations of PVA films, expanding their potential for sustainable, multifunctional packaging. Overall, CLODA coatings combine hydrophobicity with bioactive properties, offering a promising route toward environmentally friendly, high-performance packaging materials.