| Téléchargement | - Voir la version de l’auteur : Influence of lignin's pH on polyurethane flexible foam formation and how to control it (PDF, 2.0 Mio)
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| DOI | Trouver le DOI : https://doi.org/10.1002/app.50319 |
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| Auteur | Rechercher : Maillard, Damien1Identifiant ORCID : https://orcid.org/0000-0002-4111-2987; Rechercher : Osso, Esthel1; Rechercher : Faye, Adrien1; Rechercher : Li, Hongbo1; Rechercher : Ton‐That, Minh‐Tan; Rechercher : Stoeffler, Karen1 |
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| Affiliation | - Conseil national de recherches du Canada. Automobile et les transports de surface
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| Format | Texte, Article |
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| Sujet | biomaterials; cross‐linking; foams; polyurethane |
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| Résumé | Low pH of commercial lignins has a catastrophic impact on the polyurethane foaming reactions. Experiments were performed with 10 wt% of lignin with various pHs in polyols. Virgin lignin (pH 2.5, 35% moisture) has the most negative impact as it reduces the initial foam rising rate by 85% and the foam's final height by 35% as compared to the reference foam, lignin free. Drying of this lignin at 80°C for 12 h can reduce this impact while alkaline treatment to bring the lignin's pH to 6.6 almost cancel it. As revealed by in situ dielectric constant measurements, both reactions, gelling via polymerization and blowing via CO2 degassing, are impacted. In situ Fourier transform infrared analysis of the foaming process demonstrated that blowing reaction is the most pH sensitive. Two methods to counter the pH influence by pH modification were tested and provide interesting results but also significant drawbacks limiting their applicability. |
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| Date de publication | 2020-12-02 |
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| Maison d’édition | Wiley |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro du CNRC | NRC-AST-022 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 5b784b0d-a7b5-4474-b101-02740aa91f29 |
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| Enregistrement créé | 2021-02-10 |
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| Enregistrement modifié | 2021-02-10 |
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