Chemical modification of tannin/furanic rigid foams by isocyanates and polyurethanes
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-b...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Universidad del Bío-Bío
2014-12-01
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| Series: | Maderas: Ciencia y Tecnología |
| Subjects: | |
| Online Access: | https://revistas.ubiobio.cl/index.php/MCT/article/view/1219 |
| _version_ | 1797354721990672384 |
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| author | X. Li M.C. Basso V. Fierro A. Pizzi A. Celzard |
| author_facet | X. Li M.C. Basso V. Fierro A. Pizzi A. Celzard |
| author_sort | X. Li |
| collection | DOAJ |
| 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.
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| first_indexed | 2024-03-08T13:54:24Z |
| format | Article |
| id | doaj.art-9dbd23029cdf41d99de3ae634abf1d3e |
| institution | Directory Open Access Journal |
| issn | 0717-3644 0718-221X |
| language | English |
| last_indexed | 2024-03-08T13:54:24Z |
| publishDate | 2014-12-01 |
| publisher | Universidad del Bío-Bío |
| record_format | Article |
| series | Maderas: Ciencia y Tecnología |
| spelling | doaj.art-9dbd23029cdf41d99de3ae634abf1d3e2024-01-15T18:12:15ZengUniversidad del Bío-BíoMaderas: Ciencia y Tecnología0717-36440718-221X2014-12-01143Chemical modification of tannin/furanic rigid foams by isocyanates and polyurethanesX. LiM.C. BassoV. FierroA. PizziA. CelzardTannin/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. https://revistas.ubiobio.cl/index.php/MCT/article/view/1219tannin/furanic rigid foamsisocyanate modificationpolyurethane modificatonmicrostructuremechanical properties |
| spellingShingle | X. Li M.C. Basso V. Fierro A. Pizzi A. Celzard Chemical modification of tannin/furanic rigid foams by isocyanates and polyurethanes Maderas: Ciencia y Tecnología tannin/furanic rigid foams isocyanate modification polyurethane modificaton microstructure mechanical properties |
| title | Chemical modification of tannin/furanic rigid foams by isocyanates and polyurethanes |
| title_full | Chemical modification of tannin/furanic rigid foams by isocyanates and polyurethanes |
| title_fullStr | Chemical modification of tannin/furanic rigid foams by isocyanates and polyurethanes |
| title_full_unstemmed | Chemical modification of tannin/furanic rigid foams by isocyanates and polyurethanes |
| title_short | Chemical modification of tannin/furanic rigid foams by isocyanates and polyurethanes |
| title_sort | chemical modification of tannin furanic rigid foams by isocyanates and polyurethanes |
| topic | tannin/furanic rigid foams isocyanate modification polyurethane modificaton microstructure mechanical properties |
| url | https://revistas.ubiobio.cl/index.php/MCT/article/view/1219 |
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