Surface grafting of sepiolite with a phosphaphenanthrene derivative and its flame-retardant mechanism on PLA nanocomposites
| Autor: | Sophie Duquesne, Peng Jiang, Zhilin Chen, Serge Bourbigot, Sheng Zhang, Mathilde Casetta |
|---|---|
| Přispěvatelé: | Unité Matériaux et Transformations - UMR 8207 (UMET), Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut National de la Recherche Agronomique (INRA), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Nanocomposite Materials science Polymers and Plastics Sepiolite Composite number 02 engineering and technology Polymer [CHIM.MATE]Chemical Sciences/Material chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Grafting 01 natural sciences Biodegradable polymer 0104 chemical sciences [CHIM.POLY]Chemical Sciences/Polymers chemistry Chemical engineering Mechanics of Materials Materials Chemistry Char 0210 nano-technology Fire retardant |
| Zdroj: | Polymer Degradation and Stability Polymer Degradation and Stability, Elsevier, 2019, Polymer Degradation and Stability, pp.68-79. ⟨10.1016/j.polymdegradstab.2019.04.012⟩ Polymer Degradation and Stability, 2019, Polymer Degradation and Stability, pp.68-79. ⟨10.1016/j.polymdegradstab.2019.04.012⟩ |
| ISSN: | 0141-3910 1873-2321 |
| Popis: | Poly (lactic acid) (PLA), which is one of the most widely used biodegradable polymers, needs to be rendered flame retardant for use in textiles, automobiles, and electronics. Few environmentally friendly flame-retardant solutions exist for PLA mainly because of the nature of the additives (large amount introduced or the use of non-biodegradable organic additives). In this regard, natural sepiolite (SEP) is a known flame retardant for PLA mainly due to high loading (at least 25 wt %). In this study, SEP was surface-modified by grafting with 9, 10-dihydro-9-oxy-10-phosphaphenanthrene-10-oxide (DOPO) via the condensation between amino groups and salicylaldehyde with a grafting ratio of approximately 12.8%. DOPO-modified sepiolite (SEP-DOPO) was then introduced to PLA to improve the fire performance of the nanocomposites. PLA containing 10 wt % SEP-DOPO showed improved dispersion compared to a mixture of 10 wt % DOPO/SEP in a PLA matrix. Moreover, the peak of the heat release rate (pHRR) measured using mass loss calorimeter reduced by 40.7% for a loading of 10 wt % SEP-DOPO. The synergetic effect between DOPO and sepiolite was evaluated. The TGA-FTIR result showed that un-grafted DOPO was degraded before the polymer matrix, which cannot enhance the flame retardancy of the PLA composite. The solid-state nuclear magnetic resonance (NMR) spectra of the charred residues confirmed that the formed Si O Si, H3PO3, and P N crosslinking structure enhanced char formation in the condensed phase. |
| Databáze: | OpenAIRE |
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