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Thermal Stability and Flammability Behavior of Poly(3-hydroxybutyrate) (PHB) Based Composites

1
Université de Lorraine, CentraleSupélec, LMOPS, F-57000 Metz, France
2
Laboratoire Matériaux Optiques, Photoniques et Systèmes, CentraleSupélec, Université Paris-Saclay, 57070 Metz, France
3
Université Paris Est, Institut de Chimie et des Matériaux Paris-Est, UMR 7182 CNRS-UPEC, 2, rue Henri Dunant, 94320 Thiais, France
4
Aix Marseille University, CNRS, MADIREL UMR 7246, F-13397 Marseille, France
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(14), 2239; https://doi.org/10.3390/ma12142239
Received: 23 May 2019 / Revised: 8 July 2019 / Accepted: 10 July 2019 / Published: 11 July 2019
(This article belongs to the Special Issue Advanced Flame Retardant Materials)
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Abstract

A series of samples based on poly(3-hydroxybutyrate) (PHB) containing five different additives were prepared and their thermal stability and flammability were discussed. The samples first underwent flammability screening by using Pyrolysis Combustion Flow Calorimeter (PCFC) analyses. Then, four samples were selected for further investigations. PHB composites containing sepiolite (Sep.) inorganic nanofiller, and also organic ammonium polyphosphate (APP) were examined for flammability and thermal behavior using PCFC, thermogravimetric analysis (TGA), flame test, and Differential Scanning Calorimetry (DSC) analyses. Moreover, burning behavior of samples were captured on a digital camera to give a deeper sense of their flammability character for comparison. The results revealed a significant improvement of flammability and thermal stability of composites, particularly in the presence of sepiolite with respect to the value obtained for unfilled PHB. Regarding TGA results, the char residue yield was increased to ca. 20.0 wt.% in the presence of sepiolite, while 0.0 wt.% was observed for PHB. PCFC measurements uncovered higher performance of PHB-Sep. sample as signaled by 40% reduction in the peak of heat release rate with respect to PHB. According to observations, PHB-Sep. sample showed non-dripping behavior with high capacity of charring in the presence of Sep. in a vertical flame test. View Full-Text
Keywords: poly(3-hydroxybutyrate) (PHB); flame retardancy; microcalorimetry of combustion poly(3-hydroxybutyrate) (PHB); flame retardancy; microcalorimetry of combustion
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Vahabi, H.; Michely, L.; Moradkhani, G.; Akbari, V.; Cochez, M.; Vagner, C.; Renard, E.; Saeb, M.R.; Langlois, V. Thermal Stability and Flammability Behavior of Poly(3-hydroxybutyrate) (PHB) Based Composites. Materials 2019, 12, 2239.

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