Publication
Rigid polyurethane foams modified with liginin based bio-polyols
| dc.contributor.author | Salach, K. | |
| dc.contributor.author | Kurańska, M. | |
| dc.contributor.author | Pinto, João A. | |
| dc.contributor.author | Barreiro, M.F. | |
| dc.contributor.author | Prociak, A. | |
| dc.date.accessioned | 2017-09-26T09:11:43Z | |
| dc.date.available | 2017-09-26T09:11:43Z | |
| dc.date.issued | 2017 | |
| dc.description.abstract | Nowadays, a large number of polyurethane (PU) systems modifications relies on the use of different bio-polyols, as described in literature. Among them, one of the most important is the incorporation of bio-polyols based on plant wastes such as lignin. In this work, two bio-polyols have been synthesized from a technical lignin and applied to obtain rigid PU foams (10-30wt. in polyol premix). The lignin, obtained by an organosolv process (aqueous ethanol) proceeds from hardwoods and was converted into liquid bio-polyols by an oxypropylation process. The addition of the lignin-based bio-polyols to the PU system increased its reactivity, as confirmed by a faster decrease of the dielectric polarization and an increase of the maximum temperature in the foam core during the foaming process. The foam modified with these bio-polyols had a slightly lower apparent density and compressive strength. The obtained foams have an apparent density and a closed cell content of about 40 to 45 kg/m3 and 86-89%, respectively. The compressive strength of the foams decrease as the bio-polyol content increased. On the other hand the thermal conductivities of the obtained materials were similar ca. 23 mW/m·K. Concerning thermal stability, lignin-based foams start to degrade at lower temperatures and show a slower degradation pattern (high residue in TG). | pt_PT |
| dc.description.version | info:eu-repo/semantics/publishedVersion | pt_PT |
| dc.identifier.citation | Salach, K.; Kurańska, M.; Pinto, J.A.; Barreiro, M.F.; Prociak, A. (2017). Rigid polyurethane foams modified with liginin based bio-polyols . In 8th Workshop on Green Chemistry and Nanotechnologies in Polymer Chemistry. Praga, Republica Checa | pt_PT |
| dc.identifier.isbn | 978-80-85009-89-7 | |
| dc.identifier.uri | http://hdl.handle.net/10198/14547 | |
| dc.language.iso | eng | pt_PT |
| dc.publisher | Institute of Macromolecular Chemistry, Czech Academy of Sciences | pt_PT |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | pt_PT |
| dc.subject | Research subject categories | pt_PT |
| dc.subject | Technology | pt_PT |
| dc.title | Rigid polyurethane foams modified with liginin based bio-polyols | pt_PT |
| dc.type | conference object | |
| dspace.entity.type | Publication | |
| oaire.citation.conferencePlace | Praga, Republica Checa | pt_PT |
| oaire.citation.title | 8th Workshop on Green Chemistry and Nanotechnologies in Polymer Chemistry | pt_PT |
| person.familyName | Pinto | |
| person.familyName | Barreiro | |
| person.givenName | João A. | |
| person.givenName | Filomena | |
| person.identifier.ciencia-id | E518-E967-5179 | |
| person.identifier.ciencia-id | 3418-47D5-5746 | |
| person.identifier.orcid | 0000-0002-6853-9921 | |
| person.identifier.orcid | 0000-0002-6844-333X | |
| person.identifier.rid | L-9802-2014 | |
| person.identifier.scopus-author-id | 57208035714 | |
| person.identifier.scopus-author-id | 57188719717 | |
| rcaap.rights | openAccess | pt_PT |
| rcaap.type | conferenceObject | pt_PT |
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| relation.isAuthorOfPublication.latestForDiscovery | 0391987c-ba90-488b-839a-153447ce1f0f |