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Barrier coatings on dry-formed pulp with lignin, stearic acid, and combinations thereof

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  • معلومة اضافية
    • Publisher Information:
      RISE Research Institutes of Sweden, Material- och ytdesign Elsevier B.V. 2024
    • نبذة مختصرة :
      Barrier coatings on dry formed pulp were studied in this article, which were derived from Kraft lignin, stearic acid, and combinations thereof. Coating layers were applied by spray-coating with a solution of lignin or stearoyl chloride and subsequent heat treatment. Alternatively, lignin was esterified with stearoyl chloride on beforehand or combinations of lignin and stearoyl chloride on the air-laid mat were done. Since the treatments were applied prior to thermopressing, the coating agents permeated the top layers of each substrate. As our results show, coatings with lignin could improve the tensile strength and stiffness of the substrate. Grafting with stearic acid, on the other hand, affected the tensile properties negatively, which was argued to arise from worse binding of the cellulose fibers and degradation due to the presence of acid moieties. All treatments improved the barrier properties, as noted by a reduction in air permeation and water-vapor transmission rate (WVTR). The effect of spray coated lignin on WVTR was best, albeit showing less effect on the water absorption as measured by COBB1800. Stearic acid grafting yielded the opposite trend, i.e., reducing water absorption to a greater extent, while affecting WVTR less. Combinations of stearoyl chloride and lignin showed synergies and additive effects to some extent. In conclusion, various treatments for dry formed fibers were implemented and tested, which may promote the development of new barrier solutions for cellulose-based materials.
    • الموضوع:
      Copolymerization; Hot Forming; Lignins; Mass Transfer; Spray Coating; Stearic Acid; Vapor Barriers; Water Absorption; Water Vapor Permeability; Water Vapor Transmission Rate; Grafting (chemical); Wool fibers; ’Dry’ [; Barrier coatings; Coating layer; Dry forming; Esterified lignin; Kraft lignin; Spray coating; Stearic acid grafting; Thermopressing; Water vapor transmission rate; Thermoforming; Materials Engineering; Materialteknik; Article in journal; info:eu-repo/semantics/article; text
    • الرقم المعرف:
      10.1016.j.porgcoat.2024.108804
    • Availability:
      Open access content. Open access content
      info:eu-repo/semantics/openAccess
    • Note:
      application/pdf
      English
    • Other Numbers:
      UPE oai:DiVA.org:ri-75066
      0000-0002-0583-224x
      0000-0003-1779-9923
      doi:10.1016/j.porgcoat.2024.108804
      Scopus 2-s2.0-85203129473
      1511773567
    • Contributing Source:
      UPPSALA UNIV LIBR
      From OAIster®, provided by the OCLC Cooperative.
    • الرقم المعرف:
      edsoai.on1511773567
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