Publicação
Rigid polyurethane foams modified with liginin based bio-polyols
| Resumo: | 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). |
|---|---|
| Autores principais: | Salach, K. |
| Outros Autores: | Kurańska, M.; Pinto, João A.; Barreiro, M.F.; Prociak, A. |
| Assunto: | Research subject categories Technology |
| Ano: | 2017 |
| País: | Portugal |
| Tipo de documento: | documento de conferência |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Instituto Politécnico de Bragança |
| Idioma: | inglês |
| Origem: | Biblioteca Digital do IPB |
| _version_ | 1863850889348907008 |
|---|---|
| author | Salach, K. |
| author2 | Kurańska, M. Pinto, João A. Barreiro, M.F. Prociak, A. |
| author2_role | author author author author |
| author_facet | Salach, K. Kurańska, M. Pinto, João A. Barreiro, M.F. Prociak, A. |
| author_role | author |
| contributor_name_str_mv | Biblioteca Digital do IPB |
| country_str | PT |
| creators_json_str | [{\"Person.name\":\"Salach, K.\"},{\"Person.name\":\"Kurańska, M.\"},{\"Person.name\":\"Pinto, João A.\",\"Person.identifier.orcid\":\"0000-0002-6853-9921\"},{\"Person.name\":\"Barreiro, M.F.\",\"Person.identifier.orcid\":\"0000-0002-6844-333X\"},{\"Person.name\":\"Prociak, A.\"}] |
| datacite.contributors.contributor.contributorName.fl_str_mv | Biblioteca Digital do IPB |
| datacite.creators.creator.creatorName.fl_str_mv | Salach, K. Kurańska, M. Pinto, João A. Barreiro, M.F. Prociak, A. |
| datacite.date.Accepted.fl_str_mv | 2017-01-01T00:00:00Z |
| datacite.date.available.fl_str_mv | 2017-09-26T09:11:43Z |
| datacite.date.embargoed.fl_str_mv | 2017-09-26T09:11:43Z |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| datacite.subjects.subject.fl_str_mv | Research subject categories Technology |
| datacite.titles.title.fl_str_mv | Rigid polyurethane foams modified with liginin based bio-polyols |
| dc.contributor.none.fl_str_mv | Biblioteca Digital do IPB |
| dc.creator.none.fl_str_mv | Salach, K. Kurańska, M. Pinto, João A. Barreiro, M.F. Prociak, A. |
| dc.date.Accepted.fl_str_mv | 2017-01-01T00:00:00Z |
| dc.date.available.fl_str_mv | 2017-09-26T09:11:43Z |
| dc.date.embargoed.fl_str_mv | 2017-09-26T09:11:43Z |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | http://hdl.handle.net/10198/14547 |
| dc.language.none.fl_str_mv | eng |
| dc.publisher.none.fl_str_mv | Institute of Macromolecular Chemistry, Czech Academy of Sciences |
| dc.rights.cclincense.fl_str_mv | http://creativecommons.org/licenses/by/4.0/ |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| dc.subject.none.fl_str_mv | Research subject categories Technology |
| dc.title.fl_str_mv | Rigid polyurethane foams modified with liginin based bio-polyols |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_c94f |
| description | 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). |
| dirty | 0 |
| eu_rights_str_mv | openAccess |
| format | conferenceObject |
| fulltext.url.fl_str_mv | https://bibliotecadigital.ipb.pt/bitstreams/ca4e1c21-0673-46e0-bc07-51d22bf3219a/download |
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| identifier.url.fl_str_mv | http://hdl.handle.net/10198/14547 |
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| institution | Instituto Politécnico de Bragança |
| instname_str | Instituto Politécnico de Bragança |
| language | eng |
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| network_name_str | Biblioteca Digital do IPB |
| oai_identifier_str | oai:bibliotecadigital.ipb.pt:10198/14547 |
| organization_str_mv | urn:organizationAcronym:ipb |
| person_str_mv | Salach, K. Kurańska, M. Pinto, João A. Pinto, João A. https://www.ciencia-id.pt/E518-E967-5179 E518-E967-5179 http://orcid.org/0000-0002-6853-9921 0000-0002-6853-9921 Barreiro, M.F. Barreiro, M.F. https://www.ciencia-id.pt/3418-47D5-5746 3418-47D5-5746 http://orcid.org/0000-0002-6844-333X 0000-0002-6844-333X Prociak, A. |
| publishDate | 2017 |
| publisher.none.fl_str_mv | Institute of Macromolecular Chemistry, Czech Academy of Sciences |
| reponame_str | Biblioteca Digital do IPB |
| repository_id_str | urn:repositoryAcronym:ipb |
| service_str_mv | urn:repositoryAcronym:ipb |
| spelling | engInstitute of Macromolecular Chemistry, Czech Academy of Sciencespt_PTNowadays, 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).application/pdfpt_PTRigid polyurethane foams modified with liginin based bio-polyolsSalach, K.Kurańska, M.PersonalPinto, João A.DSpacehttp://dspace.org/items/1c2f6e7c-fd0b-4349-9cb9-9b78531f9bdbDSpacehttp://dspace.org/items/1c2f6e7c-fd0b-4349-9cb9-9b78531f9bdbPintoJoão A.Ciência IDhttps://www.ciencia-id.ptE518-E967-5179ORCIDhttp://orcid.org0000-0002-6853-9921Scopus Author IDhttps://www.scopus.com57208035714PersonalBarreiro, M.F.DSpacehttp://dspace.org/items/0391987c-ba90-488b-839a-153447ce1f0fDSpacehttp://dspace.org/items/0391987c-ba90-488b-839a-153447ce1f0fBarreiroFilomenaCiência IDhttps://www.ciencia-id.pt3418-47D5-5746ORCIDhttp://orcid.org0000-0002-6844-333XResearcher IDhttps://www.researcherid.comL-9802-2014Scopus Author IDhttps://www.scopus.com57188719717Prociak, A.HostingInstitutionOrganizationalBiblioteca Digital do IPBe-mailmailto:dspace@ipb.ptdspace@ipb.ptISBNIsPartOf978-80-85009-89-72017-09-26T09:11:43Z20172017-01-01T00:00:00ZHandlehttp://hdl.handle.net/10198/14547http://purl.org/coar/access_right/c_abf2open accessResearch subject categoriesTechnology1724468 bytesother research producthttp://purl.org/coar/resource_type/c_c94fconference object2017http://creativecommons.org/licenses/by/4.0/http://purl.org/coar/access_right/c_abf2application/pdffulltexthttps://bibliotecadigital.ipb.pt/bitstreams/ca4e1c21-0673-46e0-bc07-51d22bf3219a/download8th Workshop on Green Chemistry and Nanotechnologies in Polymer ChemistryPraga, Republica Checa |
| spellingShingle | Rigid polyurethane foams modified with liginin based bio-polyols Salach, K. Research subject categories Technology |
| subject.fl_str_mv | Research subject categories Technology |
| title | Rigid polyurethane foams modified with liginin based bio-polyols |
| title_full | Rigid polyurethane foams modified with liginin based bio-polyols |
| title_fullStr | Rigid polyurethane foams modified with liginin based bio-polyols |
| title_full_unstemmed | Rigid polyurethane foams modified with liginin based bio-polyols |
| title_short | Rigid polyurethane foams modified with liginin based bio-polyols |
| title_sort | Rigid polyurethane foams modified with liginin based bio-polyols |
| topic | Research subject categories Technology |
| topic_facet | Research subject categories Technology |
| url | http://hdl.handle.net/10198/14547 |
| visible | 1 |