Guilherme Rezende Costa, Marcus Vinícius Nascimento, Braz de Souza Marotti, Valdeir Arantes
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引用次数: 0
Abstract
Cellulose nanofibrils are distinguished bionanomaterials known for their unique morphology, thermal stability, and ability to form networks, yet they encounter challenges in compatibility with hydrophobic matrices, limiting their application in various applications. This study introduces an innovative surface modification method to address the high hydrophilicity of CNFs. The novelty lies in the use of lipase as a biocatalyst in combination with renewable grafting agents, specifically butanoic and oleic acids. The lipase successfully esterified both acids onto the CNFs, with butanoic acid exhibiting a higher surface concentration, resulting in a more substantial reduction in hydrophilicity. Contact angle measurements demonstrated a notable shift, from 10.84° for untreated CNF to 68.4° and 55.1° for CNFs grafted with butanoic and oleic acid residues, respectively. While there were only slight alterations in crystallinity, thermal stability, and brittleness, lipase proved to be an effective catalyst for modifying the CNF surface with fatty acids. This approach offers a method to mitigate the high hydrophilicity of CNFs without compromising their key properties. Furthermore, it can be proposed as a means to tailor CNF for water-resistant applications in fields such as electronics, packaging, and Pickering emulsions.
Graphical Abstract
The structure of the lipase protein was sourced from the Protein Data Bank (PDB), first referenced by Xie et al. [38]
期刊介绍：
The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.
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