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Characterization of thermo-physical properties of EVA/ATH: Application to gasification experiments and pyrolysis modeling
University of Lille, France.
University of Lille, France.
University of Lille, France.
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research. Luleå University of Technology, Sweden.
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2015 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 8, no 11, p. 7837-7863Article in journal (Refereed) Published
Abstract [en]

The pyrolysis of solid polymeric materials is a complex process that involves both chemical and physical phenomena such as phase transitions, chemical reactions, heat transfer, and mass transport of gaseous components. For modeling purposes, it is important to characterize and to quantify the properties driving those phenomena, especially in the case of flame-retarded materials. In this study, protocols have been developed to characterize the thermal conductivity and the heat capacity of an ethylene-vinyl acetate copolymer (EVA) flame retarded with aluminum tri-hydroxide (ATH). These properties were measured for the various species identified across the decomposition of the material. Namely, the thermal conductivity was found to decrease as a function of temperature before decomposition whereas the ceramic residue obtained after the decomposition at the steady state exhibits a thermal conductivity as low as 0.2 W/m/K. The heat capacity of the material was also investigated using both isothermal modulated Differential Scanning Calorimetry (DSC) and the standard method (ASTM E1269). It was shown that the final residue exhibits a similar behavior to alumina, which is consistent with the decomposition pathway of EVA/ATH. Besides, the two experimental approaches give similar results over the whole range of temperatures. Moreover, the optical properties before decomposition and the heat capacity of the decomposition gases were also analyzed. Those properties were then used as input data for a pyrolysis model in order to predict gasification experiments. Mass losses of gasification experiments were well predicted, thus validating the characterization of the thermo-physical properties of the material. © 2015 by the authors; licensee MDPI, Basel, Switzerland.

Place, publisher, year, edition, pages
MDPI AG , 2015. Vol. 8, no 11, p. 7837-7863
Keywords [en]
Aluminum tri-hydroxide, Ethylene vinyl acetate copolymer, Gasification, Heat capacity, Pyrolysis modelling, Thermal conductivity, Alumina, Aluminum, Capillary flow, Characterization, Cracking (chemical), Decomposition, Differential scanning calorimetry, Ethylene, Heat transfer, Hydrophobicity, Optical properties, Organometallics, Physical properties, Polyvinyl acetates, Specific heat, Thermoplastic elastomers, Complex Processes, Decomposition gas, Decomposition pathway, Experimental approaches, Modulated differential scanning calorimetry, Physical phenomena, Thermo-physical property
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Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-43929DOI: 10.3390/ma8115428Scopus ID: 2-s2.0-84949654422OAI: oai:DiVA.org:ri-43929DiVA, id: diva2:1392966
Note

Cited By :12; Export Date: 7 February 2020; Article; Correspondence Address: Bourbigot, S.; Unité Matériaux et Transformations (UMET), École Nationale Supérieure de Chimie de Lille, University of Lille, Avenue Mendeleiev, CS 90108, France; email: serge.bourbigot@ensc-lille.fr

Available from: 2020-02-14 Created: 2020-02-14 Last updated: 2020-02-19Bibliographically approved

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