| dc.creator | Li, X. | |
| dc.creator | Basso, M.C. | |
| dc.creator | Fierro, V. | |
| dc.creator | Pizzi, A. | |
| dc.creator | Celzard, A. | |
| dc.date | 2014-12-24 | |
| dc.date.accessioned | 2023-03-13T20:57:10Z | |
| dc.date.available | 2023-03-13T20:57:10Z | |
| dc.identifier | https://revistas.ubiobio.cl/index.php/MCT/article/view/1219 | |
| dc.identifier.uri | https://revistaschilenas.uchile.cl/handle/2250/223670 | |
| dc.description | Tannin/furanic rigid foams were modifi ed by either polymeric 4,4’ diphenylmethane diisocyanate (pMDI) or a one-component polyurethane still presenting reactive isocyanate groups (PUR). Several diff erent sequences of mixing the isocyanate and polyurethane with the chemicals used to prepare tannin-based foams were tested. Scanning electron microscopy (SEM) showed that addition of either pMDI or PUR yielded a more ordered microstructure of the foam and a larger cell size. Series of two diff erent cell sizes were noticed: those obtained by the evaporation of the blowing agent used for classical tannin-based foams and those caused by the formation of CO2 issued by the reaction of the isocyanate groups with water. Th e cell size, density, thermal conductivity and mechanical property of tannin/furanic foams were controlled by changing the amount of blowing agent and weight fraction of pMDI. Th e cell size of pMDI modifi ed foams was largest when the weight fraction of pMDI was 5% and kept decreasing as the pMDI percentage became higher. Th e density of the foams increased with the increase of the weight fraction of pMDI. Th e addition of pMDI increased slightly the thermal conductivity of tannin/furanic foam with the foams still presenting good thermal insulation. Moreover, the addition of pMDI in tannin/furanic foams improved markedly the foam’s mechanical properties. | es-ES |
| dc.format | application/pdf | |
| dc.language | spa | |
| dc.publisher | Universidad del Bio-Bio | en-US |
| dc.relation | https://revistas.ubiobio.cl/index.php/MCT/article/view/1219/1170 | |
| dc.rights | Copyright (c) 2015 X. Li, M.C. Basso, V. Fierro, A. Pizzi, A. Celzard | en-US |
| dc.source | Maderas-Cienc Tecnol; Vol. 14 No. 3 (2012); 257-266 | en-US |
| dc.source | Maderas-Cienc Tecnol; Vol. 14 Núm. 3 (2012); 257-266 | es-ES |
| dc.source | 0718-221X | |
| dc.source | 0717-3644 | |
| dc.subject | tannin/furanic rigid foams | es-ES |
| dc.subject | isocyanate modification | es-ES |
| dc.subject | polyurethane modificaton | es-ES |
| dc.subject | microstructure | es-ES |
| dc.subject | mechanical properties | es-ES |
| dc.title | Chemical modification of tannin/furanic rigid foams by isocyanates and polyurethanes | es-ES |
| dc.type | info:eu-repo/semantics/article | |
| dc.type | info:eu-repo/semantics/publishedVersion | |
