Utilize este identificador para referenciar este registo:
|Título:||Lignins as macromonomers for polyurethane synthesis: a comparative study on hydroxyl groups determination|
|Citação:||Cateto, C.A.; Barreiro, M.F.; Rodrigues, A.E.; Brochier-Salon, M.C.; Thielemans, W.; Belgacem, M.N. (2008) - Lignins as macromonomers for polyurethane synthesis: a comparative study on hydroxyl groups determination. Journal of Applied Polymer Science. ISSN 1097-4628. 109:5 (2008) p. 3008-3017|
|Resumo:||The hydroxyl group contents of four technical lignins [Indulin AT (Meadwestvaco), Alcell (Repap), Curan 27-11P (Borregaard LignoTech), and Sarkanda (Granit SA)] were investigated in view of their valorization as polyols in polyurethane synthesis. The different hydroxyl group contents were determined by the following methods: titration and 1H-NMR, 13C-NMR, and 31P-NMR spectroscopy. The titration method chosen was on the basis of a standard method commonly used to characterize commercial polyols for polyurethanes synthesis. The values of the total and phenolic hydroxyl contents determined by the different techniques were found to be in good agreement. For the total hydroxyl contents, coefficients of variation of 5.6% (Alcell), 3.2% (Indulin AT), 2.3% (Sarkanda), and 6.2% (Curan 27-11P) were established. For the phenolic hydroxyl contents, a good correlation was observed between data obtained from 31P-NMR and 13C-NMR for all lignin samples, except for the Sarkanda lignin, for which a relatively high coefficient of variation (12.6%) was found. For softwood lignins (Indulin AT and Curan 27-11P), the phenolic hydroxyl content determined by 1H-NMR was always lower than that deduced from 31P-NMR and 13C-NMR spectroscopy.|
|Aparece nas colecções:||CIMO - Artigos em Revistas Indexados à WoS/Scopus|
Ficheiros deste registo:
|JAPS109(2008)3008-3017.pdf||230,87 kB||Adobe PDF||Ver/Abrir Acesso Restrito. Solicitar cópia ao autor!|
Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.