Utilize este identificador para referenciar este registo: http://hdl.handle.net/10198/5234
Título: Rigid polyurethane foams from lignin based polyols
Autor: Cateto, C.A.
Barreiro, M.F.
Rodrigues, A.E.
Belgacem, M.N.
Palavras-chave: Lignin
Biopolyols
Polyurethane foams
Data: 2008
Citação: Cateto, C.A.; Barreiro, M.F.; Rodrigues, A.E.; Belgacem, M.N. (2008). Rigid polyurethane foams from lignin based polyols. In IV International Conference on Times of Polymers (TOP) and Composites. Ischia, Italy.
Resumo: Rigid polyurethane (RPU) foams were synthesized using lignin-based polyols obtained by an oxypropylation process. Alcell, Indulin AT, Curan 27-11P and Sarkanda lignins have been oxypropylated using formulations deduced from an optimization study with Alcell. L/PO/C (ratio between lignin, PO and catalyst content) of 30/70/2 and 20/80/5 were used to obtain the desired polyols. The resulting RPU foams were characterized in terms of density, mechanical properties, conductivity and morphology. All Sarkanda lignin based polyols and the 30/70/2 Curan 27-11P polyol were found inadequate for RPU formulations. Alcell and Indulin AT based polyols and the 20/80/5 Curan 27-11P polyol resulted in RPU foams with properties very similar to those obtained from conventional commercial polyols. RPU foams produced with the 30/70/2 Alcell and the 30/70/2 Indulin AT polyols exhibited improved properties compared with those from 20/80/5 based formulations.
URI: http://hdl.handle.net/10198/5234
Aparece nas colecções:CIMO - Posters em Encontros Científicos Internacionais

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