20.500.12556/RUP-23311 Pyrolysis oil-based polyurethane foams as a middle layer of the composite plywood sandwich panels for sustainable construction The construction sector’s substantial contribution to global energy consumption and CO2 emissions motivates the development of bio-based alternatives to fossil-derived rigid polyurethane (PUR) foam cores in structural sandwich panels. This study presents a comprehensive comparison of plywood sandwich panels manufactured with a rigid PUR foam containing a fast pyrolysis bio-oil (FPBO)-derived sugar polyol diluted with triethyl phosphate and panels of identical topology produced with a commercial reference PUR foam. In the bio-based formulation, a fraction of the sorbitol-based polyether polyol was replaced with the FPBO-derived sugar polyol. Both systems were characterized at the foam and panel levels for cellular microstructure, skeletal and envelope density, thermogravimetric stability, flammability, color, thermal conductivity and heat capacity, internal bond strength, compressive properties, and normal-incidence sound absorption and transmission loss. The newly developed foam exhibited similar skeletal density and porosity to the reference, comparable thermogravimetric stability with a slightly higher char residue, and lower thermal conductivity across the tested temperature range. Mechanical properties, including compressive strength, compressive modulus, and internal bond strength, showed minor reduction but remained within a comparable range. A distinct color change was observed, attributable to the presence of chromophoric constituents of the FPBO fraction. Overall, the results indicate that partial substitution of the fossil polyol with an FPBO-derived sugar polyol is technically feasible, yielding materials with comparable thermal, mechanical, or acoustic performance. No consistent performance advantage of either system was observed across the evaluated properties. The results support the potential of pyrolysis-derived bio-polyols for use in sustainable structural insulation products. Znaten prispevek gradbenega sektorja k svetovni porabi energije in emisijam CO2 spodbuja razvoj bioloških alternativ jedrom iz toge poliuretanske (PUR) pene, pridobljene iz fosilnih goriv, ​​v strukturnih sendvič ploščah. Ta študija predstavlja celovito primerjavo sendvič plošč iz vezanega lesa, izdelanih iz toge PUR pene, ki vsebuje sladkorni poliol, pridobljen iz hitro piroliznega bioolja (FPBO), razredčen s trietil fosfatom, in plošč z identično topologijo, izdelanih s komercialno referenčno PUR peno. V biološki formulaciji je bil delež polieterskih poliolov na osnovi sorbitola nadomeščen s sladkornim poliolom, pridobljenim iz FPBO. Oba sistema sta bila na ravni pene in plošče karakterizirana glede na celično mikrostrukturo, gostoto skeleta in ovoja, termogravimetrično stabilnost, vnetljivost, barvo, toplotno prevodnost in toplotno kapaciteto, notranjo trdnost vezi, tlačne lastnosti ter absorpcijo zvoka in izgubo prenosa pri normalnem vpadu. Novo razvita pena je pokazala podobno gostoto in poroznost skeleta kot referenčna pena, primerljivo termogravimetrično stabilnost z nekoliko višjim ostankom oglja in nižjo toplotno prevodnost v preizkušenem temperaturnem območju. Mehanske lastnosti, vključno s tlačno trdnostjo, tlačnim modulom in notranjo vezno trdnostjo, so se nekoliko zmanjšale, vendar so ostale v primerljivem območju. Opazili so izrazito spremembo barve, ki jo je mogoče pripisati prisotnosti kromofornih sestavin frakcije FPBO. Na splošno rezultati kažejo, da je delna zamenjava fosilnega poliola s sladkornim poliolom, pridobljenim iz FPBO, tehnično izvedljiva, kar daje materiale s primerljivimi toplotnimi, mehanskimi ali akustičnimi lastnostmi. Pri nobenem od ocenjenih sistemov ni bilo opažene dosledne prednosti v delovanju. Rezultati podpirajo potencial biopoliolov, pridobljenih s pirolizo, za uporabo v trajnostnih konstrukcijskih izolacijskih izdelkih. bio-based polyol fast pyrolysis bio-oil rigid polyurethane foams waste valorization biološki poliol hitro pirolizno bioolje trde poliuretanske pene valorizacija odpadkov true false true Angleški jezik Slovenski jezik Članek v reviji 2026-07-14 10:19:37 2026-07-14 10:19:39 2026-07-15 03:06:01 0000-00-00 00:00:00 2026 0 0 str. 1-25 iss. 7, [article no.] 824 Vol. 17 Jun. 2026 0000-00-00 PostprintKoncna NiDoloceno NiDoloceno 0000-00-00 0000-00-00 2026-06-13 630*83 1999-4907 10.3390/f17070824 284686595 RAZ_Grzybek_Jakub_2026.pdf RAZ_Grzybek_Jakub_2026.pdf 1 6FBBEE92746BB7A01316D290DAE0B003 39f513a2e4abe88cf155cd990e6c8d4348be485ccc276126e20f2e4460b14758 b847b8f7-7f5c-11f1-9e8d-005056ac49c0 https://repozitorij.upr.si/Dokument.php?lang=slv&id=34084 https://www.mdpi.com/1999-4907/17/7/824 1 92226c88-7f5c-11f1-9e8d-005056ac49c0 https://repozitorij.upr.si/Dokument.php?lang=slv&id=34083 Inštitut Andrej Marušič 0 0 0