Laser sintering of coated polyamide 12: a new way to improve flammability

Autor: Marcos Batistella, Ouassila Kadri, Arnaud Regazzi, Monica Francesca Pucci, José-Marie Lopez-Cuesta, Florence Ayme, David Bordeaux
Přispěvatelé: Durabilité des éco-Matériaux et Structures (DMS), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-IMT - MINES ALES (IMT - MINES ALES), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), SDTech, Polymères Composites et Hybrides (PCH - IMT Mines Alès), IMT - MINES ALES (IMT - MINES ALES)
Rok vydání: 2022
Předmět:
Zdroj: Journal of Materials Science
Journal of Materials Science, Springer Verlag, 2022, 57 (1), pp.739-754. ⟨10.1007/s10853-021-06621-7⟩
ISSN: 1573-4803
0022-2461
Popis: International audience; In this study coatings of kaolin and talc particles were successfully applied on the surface of polyamide 12 powder intended for laser sintering (LS). Microscopic observations revealed that using carboxymethyl cellulose (CMC) as surface modifier for fillers led to a better coverage of polymer grains with a surface coverage between 6 and 16% as a function of filler type and content. Differential scanning calorimetry measurements showed that the addition of talc and kaolin led to an increase in the crystallization temperature of PA12, but at the expense of processability. Process parameters were optimized in order to manufacture LS samples with the different coated powders. Fire behavior assessed by cone calorimetry showed that the use of CMC resulted in a significant decrease in the peak of heat release rate depending on the filler type and content. This behavior can be partially explained by an interaction between CMC, fillers and polymer, with the formation of amide linkage between carboxyl part of CMC and amine end groups of polyamide, resulting in an increase in the complex viscosity of materials.
Databáze: OpenAIRE
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