Publicação
Oxypropylation of lignins and characterization of the ensuing polyols
| dc.contributor.author | Cateto, Carolina | |
| dc.contributor.author | Barreiro, M.F. | |
| dc.contributor.author | Rodrigues, Alírio | |
| dc.contributor.author | Belgacem, Mohamed Naceur | |
| dc.date.accessioned | 2010-02-09T10:16:26Z | |
| dc.date.available | 2010-02-09T10:16:26Z | |
| dc.date.issued | 2007 | |
| dc.description.abstract | Four lignin samples (Alcell, Indulin AT, Curan 27-11P and Sarkanda) were converted into liquid polyols by a chain extension reaction with propylene oxide (oxypropylation). The reaction was carried out in a batch reactor using potassium hydroxide (KOH) as a catalyst. The oxypropylation process was first optimized with Alcell lignin by modifying the lignin/propylene oxide ratio (L/PO, w/v) and catalyst content (C/(C+L), % w/w). L/PO ratios of 10/90, 20/80, 30/70 and 40/60, and catalyst contents from 2 to 5% were used. Based on the studied formulations, and considering the polyol requirements for polyurethane foam synthesis (a hydroxyl number (IOH) between 300 and 800 and a viscosity below 300 Pa.s), three formulations were chosen and applied for the oxypropylation the other lignin samples: 20/80/5, 30/70/2 and 35/65/2. The produced polyols were characterized. Their IOH and viscosity were found to be in the range of those typical of commercial polyols employed in polyurethane preparation. | pt |
| dc.description.sponsorship | Portuguese Foundation for Science and Technology (grant SFRH/BD/18415/2004) and the French-Portuguese Scientific Cooperation Programme (action F-13/06). | pt |
| dc.identifier.citation | Cateto, C.A.; Barreiro, M.F.; Rodrigues, A.E.; Belgacem, M.N. (2007-05) - Oxypropylation of lignins and characterization of the ensuing polyols.In 8th ILI Forum. Rome. p.115-118 | pt |
| dc.identifier.uri | http://hdl.handle.net/10198/1781 | |
| dc.language.iso | eng | pt |
| dc.publisher | ILI - The International Lignin Institute | pt |
| dc.subject | Lignin | pt |
| dc.subject | Oxypropylation | pt |
| dc.subject | Biopolyols | pt |
| dc.subject | Characterization | pt |
| dc.title | Oxypropylation of lignins and characterization of the ensuing polyols | pt |
| dc.type | conference paper | |
| dspace.entity.type | Publication | |
| oaire.citation.conferencePlace | Rome, Italy | pt |
| oaire.citation.endPage | 118 | pt |
| oaire.citation.startPage | 115 | pt |
| oaire.citation.title | 8th ILI Forum | pt |
| person.familyName | Barreiro | |
| person.givenName | Filomena | |
| person.identifier.ciencia-id | 3418-47D5-5746 | |
| person.identifier.orcid | 0000-0002-6844-333X | |
| person.identifier.rid | L-9802-2014 | |
| person.identifier.scopus-author-id | 57188719717 | |
| rcaap.rights | restrictedAccess | pt |
| rcaap.type | conferenceObject | pt |
| relation.isAuthorOfPublication | 0391987c-ba90-488b-839a-153447ce1f0f | |
| relation.isAuthorOfPublication.latestForDiscovery | 0391987c-ba90-488b-839a-153447ce1f0f |