Enzyme-assisted mechanical production of cellulose nanofibrils: thermal stability
- 140 Downloads
The influence of enzymatic treatment on the thermal stability of cellulose nanofibrils (CNFs) was investigated. The unbleached bagasse pulp was treated with different dosages of xylanase, and samples were taken at different grinding stages. The produced CNF were characterized by Malvern Zetasizer, TEM, ATR-FTIR and XRD, and the thermal stability of the CNF was evaluated using TGA. The mechanism of enzymatic treatment on the thermal stability of CNF was proposed. The results indicated that all the diameters of produced CNF were < 100 nm. The CNF produced from original pulp has higher thermal stability than those from enzymatic-treated pulp, and the thermal stability of CNF was decreased with the increase of enzyme dosage. The practical application of CNF was actually limited by the reduction of pyrolysis sites, so the proper retention of hemicellulose and lignin in the process of preparing CNF contributes to the improvement of the thermal stability.
KeywordsCellulose nanofibrils Enzymatic treatment Xylanase Thermal stability
This project was supported by the National Natural Science Foundation of China (31760192), the Scientific Research Foundation of Guangxi University (XGZ160166), and the Guangxi Natural Science Foundation of China (2016GXNSFBA380234).
- Dhandapani R, Sharma S (2014) Environmentally benign pretreatments for producing microfibrillated cellulose fibers from hemp. Lightweight materials from biopolymers and biofibers. ACS symposium series, vol 1175. American Chemical Society, Washington. https://doi.org/10.1021/bk-2014-1175.ch005 Google Scholar
- Gedler G, Antunes M, Realinho V, Velasco JI (2012) Thermal stability of polycarbonate-graphene nanocomposite foams. Polym Degrad Stab 97:1297–1304. https://doi.org/10.1016/j.polymdegradstab.2012.05.027 CrossRefGoogle Scholar
- Jacquet N et al (2011) Influence of steam explosion on the thermal stability of cellulose fibres. Polym Degrad Stab 96:1582–1588. https://doi.org/10.1016/j.polymdegradstab.2011.05.021 CrossRefGoogle Scholar
- Khouri S (2010) Experimental characterization and theoretical calculations of responsive polymeric systems. UWSpaceGoogle Scholar
- Meng Q, Li H, Fu S, Lucia LA (2014) The non-trivial role of native xylans on the preparation of TEMPO-oxidized cellulose nanofibrils. React Funct Polym 85:142–150. https://doi.org/10.1016/j.reactfunctpolym.2014.07.021 CrossRefGoogle Scholar
- Quiévy N, Jacquet N, Sclavons M, Deroanne C, Paquot M, Devaux J (2010) Influence of homogenization and drying on the thermal stability of microfibrillated cellulose. Polym Degrad Stab 95:306–314. https://doi.org/10.1016/j.polymdegradstab.2009.11.020 CrossRefGoogle Scholar