Measurement of kinetics and thermodynamics of the thermal degradation for flame retarded materials : Application to EVA/ATH/NC

• The modelling of the behavior of a material exposed to fire is very complex and needs the coupling of fluid dynamics, combustion, heat and mass transfer, kinetics and so forth. A growing amount of studies and numerical models are reported in this field since the last decade. The aim of these models is to predict the fire behavior of wood, charring or non-charring polymers and even intumescent materials. However, these studies are seldom applied to formulated materials and especially flame retarded materials. In this study, an ethylene-vinyl acetate copolymer was formulated with a flame retardant (aluminum tri-hydroxide) and a synergist (nanoclays). A systematic approach for the characterization of the thermo-physical properties of the material as well as of its optical properties and the heat capacity of the decomposition gases is proposed and applied in this study. It is shown that it is possible to evaluate the input data required for pyrolysis modelling, even for multi decomposition steps materials. It is also shown that the diffusion of the gases inside the material had to be considered on the opposite of the classical assumption found in other studies. Indeed, using low mass diffusivity was the sole way to predict in the same time the temperature distribution and the mass loss rate of the material in a gasification experiments.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik -- Husbyggnad (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Civil Engineering -- Building Technologies (hsv//eng)

Nyckelord

Aluminum tri-hydroxide

Diffusion

Ethylene vinyl acetate copolymer

Fire retardancy

Gasification

Heat capacity

Montmorillonite

Pyrolysis modelling

Thermal conductivity

Aluminum

Capillary flow

Clay minerals

Ethylene

Hydrophobicity

Mass transfer

Nanocomposites

Optical properties

Organometallics

Polyvinyl acetates

Pyrolysis

Specific heat

Thermodynamics

Thermoplastic elastomers

Charring polymers

Decomposition gas

Flame-retarded

Heat and mass transfer

Kinetics and thermodynamics

Thermo-physical property

Characterization

Stålbyggnad

Publikations- och innehållstyp

ref (ämneskategori)

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