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FTIR Monitoring of Polyurethane Foams Derived from Acid-Liquefied and Base-Liquefied Polyols

2024Journal article Open access
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dc.contributor.authorDulyanska, Yuliya
dc.contributor.authorCruz-Lopes, Luísa
dc.contributor.authorEsteves, Bruno
dc.contributor.authorGuiné, Raquel
dc.contributor.authorDomingos, Idalina
dc.date.accessioned2024-08-20T11:18:34Z
dc.date.available2024-08-20T11:18:34Z
dc.date.issued2024
dc.description.abstractPolyalcohol liquefaction can be performed by acid or base catalysis, producing polyols with different properties. This study compared the mechanical properties of foams produced using polyols from liquefied Cytisus scoparius obtained by acid and base catalysis and using two different foam catalysts. The differences were monitored using FTIR analysis. Acid-catalyzed liquefaction yielded 95.1%, with the resultant polyol having an OH index of 1081 mg KOH/g, while base catalysis yielded 82.5%, with a similar OH index of 1070 mg KOH/g. Generally, compressive strength with dibutyltin dilaurate (DBTDL) ranged from 16 to 31 kPa (acid-liquefied polyol) and 12 to 21 kPa (base-liquefied polyol), while with stannous octoate (TIN), it ranged from 17 to 42 kPa (acid) and 29 to 68 kPa (base). Increasing water content generally decreased the compressive modulus and strength of the foams. Higher water content led to a higher absorption at 1670 cm−1 in the FTIR spectrum due to the formation of urea. Higher isocyanate indices generally improved compressive strength, but high amounts led to unreacted isocyanate that could be seen by a higher absorption at 2265 cm−1 and 3290 cm−1. DBTL was shown to be the best foam catalyst due to higher trimer conversion seen in the spectra by a higher absorption at 1410 cm−1. Acid- and base-derived polyols lead to different polyurethane foams with different FTIR spectra, particularly with a higher absorption at 1670 cm−1 for foams from acid-derived liquefaction.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationDulyanska Y, Cruz-Lopes L, Esteves B, Guiné R, Domingos I. (2024) FTIR Monitoring of Polyurethane Foams Derived from Acid-Liquefied and Base-Liquefied Polyols. Polymers, 16(15):e2214 (13 pp.)pt_PT
dc.identifier.doi10.3390/polym16152214pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.19/8469
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.subjectbase liquefactionpt_PT
dc.subjectacid liquefactionpt_PT
dc.subjectcompressive strengthpt_PT
dc.subjectpolyurethane foamspt_PT
dc.subjectFTIRpt_PT
dc.titleFTIR Monitoring of Polyurethane Foams Derived from Acid-Liquefied and Base-Liquefied Polyolspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issue15pt_PT
oaire.citation.startPage2214pt_PT
oaire.citation.titlePolymerspt_PT
oaire.citation.volume16pt_PT
person.familyNameGonçalves Oliveira Valente da Cruz-Lopes
person.familyNameEsteves
person.familyNamede Pinho Ferreira Guiné
person.familyNameDomingos
person.givenNameLuísa Paula
person.givenNameBruno
person.givenNameRaquel
person.givenNameidalina
person.identifier2119255
person.identifierhttps://scholar.google.pt/citations?user=abFDovIAAAAJ&hl=pt-PT
person.identifier.ciencia-id7916-0833-5B38
person.identifier.ciencia-id521B-63A7-B248
person.identifier.ciencia-id8B13-5492-0F23
person.identifier.ciencia-id7116-E1DE-88E7
person.identifier.orcid0000-0001-6502-7202
person.identifier.orcid0000-0001-6660-3128
person.identifier.orcid0000-0003-0595-6805
person.identifier.orcid0000-0002-4308-1563
person.identifier.ridC-2173-2012
person.identifier.scopus-author-id57202554441
person.identifier.scopus-author-id6603138390
person.identifier.scopus-author-id24281086400
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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