Data/hora: 05/06/2024 08:51:31

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 06/11/2019
Data da última atualização: | 10/12/2019
Autoria: | DELUCIS, R. de A.; KERCHE, E. F.; GATTO, D. A.; MAGALHAES, W. L. E.; PETZHOLD, C. L.; AMICO, S. C.
Afiliação: | RAFAEL DE AVILA DELUCIS, UNIVERSIDADE FEDERAL DE PELOTAS; EDUARDO FISCHER KERCHE, UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL; DARCI ALBERTO GATTO, UNIVERSIDADE DE PELOTAS; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; CESAR LIBERATO PETZHOLD, UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL; SANDRO CAMPOS AMICO, UNIVERSIDADE FEDERAL DE PELOTAS.
Título: | Surface response and photodegradation performance of bio-based polyurethane-forest derivatives foam composites.
Ano de publicação: | 2019
Fonte/Imprenta: | Polymer Testing, v. 80, article 106102, Dec. 2019.
ISBN: | 10.1016/j.polymertesting.2019.106102
Idioma: | Inglês
Conteúdo: | Rigid polyurethane (PU) foams are popular expanded polymers mostly due to their thermal and mechanical properties, although aesthetical features and photodegradation resistance are also of interest for certain applications. In this study, four different forest-based wastes (wood, bark, kraft lignin and paper sludge) were incorporated into rigid PU foams and their surface response and photodegradation resistance were investigated. The rigid foams were prepared via free rise pouring method and later aged by UV radiation. Their colour and specular gloss were evaluated according to the CIELab method. Contact angle measurements and morphological characterization by optical (OM) and scanning electron microscopy (SEM) were also carried out. The forestbased fillers induced different colour patterns on the rigid foams and their photodegradation yielded a decrease in L* and specular gloss and an increase in a* and b*, especially over the first 20 days of UV-exposure. These effects were accompanied by an increase in surface wettability and weakening of the foam structure. Also, the foams of darker colour (i.e. with bark and kraft lignin fillers) presented greater photodegradation resistance.
Palavras-Chave: | Biofoam; CIELAB method; Kraft lignin; Paper sludge; Polyurethane foam.
Thesaurus Nal: | Composite polymers; Polyurethanes.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (57034-1) - UPC - AP - DD -  -  -  - DIS