| Autor: |
Khadraoui, M., Nader, S., Khiari, R., Brosse, N., Bergaoui, L., Mauret, E. |
| Předmět: |
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| Zdroj: |
Cellulose; Jan2023, Vol. 30 Issue 2, p815-832, 18p |
| Abstrakt: |
Currently, less energetic and more ecological methods as well as new raw materials are studied to produce cellulose micro/nanofibrils which are very attractive bio-based and renewable nanomaterials. In this context, the valorisation of Posidonia oceanica, a dominant sea grass on the Mediterranean Sea, is carried out by preparing cellulose micro/nanofibrils with high lignin content (LCM/NF). To evaluate the role of lignin sulfonation in facilitating the mechanical microfibrillation, an alkaline pretreatement using sodium sulfite (Na2SO3) was suggested. Thereafter, lignocellulosic micro/nanofibrils (LCM/NF) were produced (with and without lignin sulfonation) by combining steam explosion process or twin-screw extrusion as energy efficient pretreatments with a conventional grinding step. The chemical composition of the fibres, before and after pulping, was analysed. To select the most efficient combination of treatments, after the microfibrillation step, the obtained LCM/NF suspensions were characterized by several techniques such as morphological analysis. Tensile test was also performed on LCM/NF nanopapers. It has been shown that sulfonation, pulps with sulfonic group contents between 50 and 70 µmol/g, coupled with steam explosion or twin-screw extrusion, allowed producing LCM/NF gels with relative low viscosity and nanopapers with Young's modulus around 5 GPa. Finally, it is worth noting that sulfonation is an efficient pretreatment for decreasing the consumed energy during grinding and the ensuing quality can be investigated in many applications such as packaging etc. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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