Valorization of Kraft black liquor and tannins via porous material production
Résumé
Macroporous polymeric monoliths were prepared using, as main raw material, mixtures of hydrolysable and condensed tannins and Kraft black liquor from pulp industry. The process consists of mechanical frothing of aqueous solutions constituted with the different polyphenols, a hardener, and in the presence of a surfactant that maintains the foam stable before curing. The aim of this work was to study the contribution in the formulations of Kraft black liquor on physical properties for the foams. This objective was justified by the significantly lower cost of black liquor as compared with that of tannins. The target application is the thermal and sound insulation in the building industry. The materials obtained were characterized by scanning electronic microscopy, mercury porosimetry and mechanical, thermal and acoustical measurements.Solid, self-standing foams with an average porosity of 90% and an average cell diameter between 170 and 329μm were obtained. The measured values of compression modulus ranged from 1.8 up to 21.6MPa and the thermal conductivity was around 40mW·K-1 m-1. The materials showed also good sound absorption characteristics at medium frequencies with coefficients of 0.5 (500Hz) and 0.8 (1000Hz) and at high frequencies with coefficients of 0.7 (2000Hz) and 0.8 (4000Hz). © 2016 The Authors.
Mots clés
Solutions
Sound absorption characteristic
Acoustic wave absorption
Bio-based
Biobased porous materials
Characterization
Compression modulus
Construction industry
Flavonoids
Kraft black liquor
Kraft process
Medium frequencies
Mercury porosimetry
Physical characterization
Physical characterizations
Porous materials
Scanning electronic microscopy
Sound insulating materials
Sound insulation
Tannins
Thermal conductivity
Thermal insulation
Domaines
Chimie
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