Eur. Phys. J. Appl. Phys.
Volume 80, Number 2, November 2017
Materials for Energy harvesting, conversion and storage II (ICOME 2016)
|Number of page(s)||8|
|Section||Physics of Organic Materials and Devices|
|Published online||25 October 2017|
Valorization of Tunisian alfa fibres and sumac tannins for the elaboration of biodegradable insulating panels★
Laboratoire des Matériaux Composites et Minéraux Argileux (LMCMA), Centre National des Recherches en Sciences des Matériaux (CNRSM), Technopôle Borj Cédria,
2 EPCP/IPREM, IUT des Pays de l'Adour, 371 rue du Ruisseau, BP 201, 40004 Mont de Marsan, France
3 Unité de recherche de chimie industrielle organique et alimentaire 00UR/1201, Institut National des Sciences Appliquées et de Technologie INSAT, Centre Urbain Nord B.P. N°676/1080, Tunis, Tunisia
* e-mail: email@example.com
Received in final form: 28 April 2017
Accepted: 21 August 2017
Published online: 25 October 2017
Alfa leaves are important renewable raw materials in Tunisia where they are used basically in handcrafts and paper industry. Sumac is also an abundant species in Tunisia known for its high tannin content and is basically used in traditional medicine. To valorize these natural resources, we studied, for the first time, the possibility of making insulating panels based on alfa fibres and sumac tannins based adhesive. Firstly, alfa leaves were treated with an alkali solution as it is one of the standard procedures commonly used in the paper industry to extract cellulosic fibres. Mercerization effects were studied by characterizing fibres thermal properties and fibres surface morphology. Secondly, the sumac tannin based resin was formulated and characterized. Finally, the insulating panel was elaborated and characterized by determining its thermal conductivity. The thermal gravimetric analysis results show improvement in the thermal stability of fibres after alkali treatment. Environmental Scanning Electron Microscopy showed changes on treated alfa surface which could promote the fibre-matrix adhesion. The reactivity of sumac tannins to formaldehyde test (Stiasny number) showed the possible use of sumac tannins in wood adhesive formulation. Thermomechanical analysis and strength analysis of sumac tannin/hexamin based resin highlighted acceptable bonding properties. The thermal conductivity measurement showed an average value equal to 0.110 W/m K.
© EDP Sciences, 2017
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