resumo
Nowadays, packaging applications require the use of advanced materials as well as production methods that have a low environmental impact. In this study, a solvent-free photopolymerizable paper coating was developed using two acrylic monomers (2-ethylhexyl acrylate and isobornyl methacrylate). A copolymer, with a molar ratio of 2-ethylhexyl acrylate/isobornyl methacrylate of 0.64/0.36, was prepared and used as the main component of the coating formulations (50 and 60 wt%). A mixture of the monomers with the same proportion was used as a reactive solvent, yielding formulations with 100% solids. The coated papers showed an increase in the pick-up values from 6.7 to 32 g/m(2) depending on the formulation used and the number of coating layers (up to two). The coated papers maintained their mechanical properties and presented improved air barrier properties (Gurley's air resistivity of approximate to 25 s for the higher pick-up values). All the formulations promoted a significant increase in the paper's water contact angle (all higher than 120 degrees) and a remarkable decrease in their water absorption (Cobb values decrease from 108 to 11 g/m(2)). The results confirm the potential of these solventless formulations for fabricating hydrophobic papers with potential application in packaging, following a quick, effective, and more sustainable approach.
palavras-chave
BIO-BASED COATINGS; UV; COPOLYMERS; ADHESION; SURFACE
categoria
Polymer Science
autores
Silva, FM; Pinto, RJB; Barros-Timmons, A; Freire, CSR
nossos autores
Ana Margarida Madeira Viegas de Barros Timmons
Professor associado
Carmen Sofia da Rocha Freire Barros
Investigador Coordenador
Fábio Martins Silva
Estudante de doutoramento
Ricardo Pinto
InvestigadorProjectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This work was carried out under the Project Inpactus-innovative products and technologies from eucalyptus, Project No 21874 funded by Portugal 2020 through the European Regional Development Fund (ERDF) in the frame of COMPETE 2020 no246/AXIS II/2017. This work was also developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 and LA/P/0006/2020, financed by national funds through the FCT/MCTES (PIDDAC). The research contract of R.J.B. Pinto was funded by national funds (OE), through FCT in the scope of the framework contract foreseen in the numbers 4, 5, and 6 of the article 23, of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19. FCT is also acknowledged for the research contract under Scientific Employment Stimulus to C.S.R.F. (CEECIND/00464/2017).