Application de l’analyse du cycle de vie lors de la conception de matériaux poreux à partir de la biomasse

Abstract : Black liquor is a by-product of paper pulp production and is daily produced in large quantities. Non-competitive to the food industry, this wood-based by-product is an important source of biopolymers. Black-liquor based concentrated and stable emulsions were obtained by dispersing an organic phase into black liquor. Among the considered dispersed phases, castor oil and ethylene dichloride were the most suited. Similar materials were prepared by polymerising the concentrated emulsions containing those dispersed phases. The obtained porous monoliths, called polyECs, were compared by life cycle assessment. The results showed that using ethylene dichloride as the dispersed phase was more beneficial for the environment than using castor oil. Through pyrolysis, the polymeric matrix of the polyECs was processed into carbon to produce carboECs. The bio-based porous carbons presented a microporous and a mesoporous structure that is of interest for energy storage, in particularly supercapacitors. The exploratory tests showed that the carboECs efficiency as supercapacitors were similar to what found in literature. The choice of black liquor as the main raw material was made through an eco-design approach. To comfort that approach, the black-liquor-based carboECs were compared to a poly(styrene-co-divinylbenzene)-based carboECs using life cycle assessment. This study showed that using black liquor instead of styrene/divinylbenzene is beneficial.
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Amandine Foulet. Application de l’analyse du cycle de vie lors de la conception de matériaux poreux à partir de la biomasse. Chimie analytique. Université de Bordeaux, 2015. Français. ⟨NNT : 2015BORD0168⟩. ⟨tel-01325242⟩

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