Valorization of cardboard waste in the production of polyurethane biocomposites: A new and environmentally friendly material for civil construction.

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dc.contributorFEDERAL UNIVERSITY OF LAVRAS - UFLA
dc.contributorFEDERAL UNIVERSITY OF LAVRAS - UFLA
dc.contributor,FEDERAL UNIVERSITY OF LAVRAS - UFLA
dc.contributorUNIVERSITY OF CAMPINAS – UNICAMP
dc.contributorFEDERAL CENTER OF TECHNOLOGICAL EDUCATION OF MINAS GERAIS - CEFET-MG
dc.contributorFEDERAL CENTER OF TECHNOLOGICAL EDUCATION OF MINAS GERAIS - CEFET-MG
dc.contributorFEDERAL CENTER OF TECHNOLOGICAL EDUCATION OF MINAS GERAIS - CEFET-MG
dc.contributorFEDERAL UNIVERSITY OF LAVRAS - UFLA.
dc.creatorFARIA, D. L.
dc.creatorMESQUITA JUNIOR, L.
dc.creatorLAGO, R. C. do
dc.creatorSORIANO, J.
dc.creatorGUIMARÃES JUNIOR, M.
dc.creatorPIRES, N. J.
dc.creatorAugusto Cesar da Silva Bezerra
dc.creatorOLIVEIRA, J. E. de
dc.date2025-05-09T19:50:38Z
dc.date2025-05-09T19:50:38Z
dc.date2025-05-09
dc.date2025
dc.date.accessioned2026-07-07T04:29:48Z
dc.descriptionCardboard has been widely used in various applications and industry sectors, such as in civil construction as a formwork for concreting circular columns. In addition to the versatility of the product, a vast amount of waste is generated by the manufacturing process. The objective of this work was to determine the properties of green polyurethane matrix thermosetting composites reinforced with cardboard tube waste for application as thermal insulation in buildings. Preliminarily, alkaline solutions of NaOH and Ca(OH)2 were applied to the residues to remove oils and waxes that affect the polymerization of vegetable polyurethane. The cardboard tube waste was characterized according to its chemical composition, basic density, infrared spectra, atomic force microscopy, Xray diffraction, and surface SEM images. The composites were produced with 10 % (wt%) treated cardboard waste and without surface treatment to replace vegetable polyurethane through the hand lay-up method. Specimens were obtained from the composites to perform tensile tests, determine the bulk density, water absorption, and thermal conductivity, and visualize the matrix–reinforcement interface via SEM. The data indicated that surface NaOH and Ca(OH)2 treatments significantly increased the tensile strength of the composites by 76 and 187 %, respectively, compared with that of the polymer. For the composites, the use of cardboard waste significantly increased the thermal insulation, as proven by the thermal conductivity varying from 0.0607 to 0.0632 W/(m. K) and compatible with other insulating materials used in civil construction. Thus, composite polymers generated from cardboard tube waste are potential sustainable alternative construction materials.
dc.format16 p.
dc.identifierConstruction and Building Materials, v. 462, 139902, 2025.
dc.identifier0950-0618
dc.identifierhttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1175463
dc.identifierhttps://doi.org/10.1016/j.conbuildmat.2025.139902
dc.identifier.urihttp://hdl.handle.net/123456789/463165
dc.languageeng
dc.rightsopenAccess
dc.subjectCardboard waste valorization
dc.subjectLignocellulosic fiber
dc.subjectNatural fiber-reinforced composites
dc.subjectPolymeric composites
dc.subjectVegetal polyurethane resin
dc.titleValorization of cardboard waste in the production of polyurethane biocomposites: A new and environmentally friendly material for civil construction.
dc.typeArtigo de periódico

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