resumo
Crosslinking with genipin increases the acidic stability of chitosan-based materials, opening an opportunity to explore new applications. In this work, the viability of using chitosan-genipin solutions on cellulose-based materials coating was studied. Non-calendered paper and cardboard were used as raw materials. Different number of chitosan-genipin coating layers (1, 3, 6, 20, and 30) were applied and their influence on the materials mechanical, physicochemical, and barrier properties was studied. The small thickness and basis weight of non- calendered paper resulted in an inefficient adhesion of chitosan-genipin coating to the cellulose fibers. However, in cardboard, chitosan-genipin created a dense layer onto the cellulosic-fibers surface without impairing their mechanical properties. It conferred a greenish color, whose intensity increased with the layers number. The chitosan-genipin coating decreased the cardboard air and water vapor permeability up to 71 % and 52 %, respectively, and acted as a physical barrier for cardboard compounds leaching, being suitable for covering cellulose-based materials.
palavras-chave
NANOCOMPOSITE FILMS; ANTIMICROBIAL PROPERTIES; CARBOXYMETHYL CELLULOSE; ANTIOXIDANT ACTIVITY; BARRIER PROPERTIES; PAPER SHEETS; WATER; COMPOSITE; HYDROGELS; COATINGS
categoria
Chemistry; Polymer Science
autores
Oliveira, G; Goncalves, I; Nunes, C; Ferreira, P; Coimbra, MA; Martin, C; Bras, J
nossos autores
Gonçalo Vieira Saraiva de Oliveira
Estudante de doutoramento
Idalina José Monteiro Gonçalves
Investigador Júnior
Paula Celeste da Silva Ferreira
Investigador CoordenadorGrupos
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G4 - Materiais Renováveis e Economia Circular
agradecimentos
This work was developed within the scope of the projects QOPNA (UID/QUI/00062/2019), LAQV-REQUIMTE (UIDB/50006/2020) and CICECO-Aveiro Institute of Materials (UIDB/50011/2020 & UIDP/50011/2020), financed by national funds through the FCT/MCTES and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement. GO and IG thank COST action FP1495 for two short-term scientific mission grants. FCT is also thanked for the Investigator FCT program (PF, IF/00300/2015), for the Individual Call to Scientific Employment Stimulus (IG, CEECIND/00430/2017), and for the grants ref. SFRH/BD/143191/2019 (GO), SFRH/BPD/104712/2014 (IG), and SFRH/BPD/100627/2014 (CN). CN also acknowledges her research contract (CDL-CTTRI-88-89-97-ARH/2018) which is funded by national funds (OE), through FCT -Fundacao para a Ciencia e a Tecnologia, I.P., in the scope of the framework contract foreseen in numbers 4, 5 and 6 of the article 23, of the Law Decree 57/2016, of August 29, changed by Law 57/2017, of July 19.