|
|||||
|
|
Influence of homogenization and drying on the thermal stability of microfibrillated cellulose |
|
| Authors: | N Quiévy N Jacquet M Sclavons M Paquot |
| Institution: | a Université Catholique de Louvain, Unité de chimie et de physique des hauts polymères, Place Croix du Sud, 1, B-1348 Louvain-la-Neuve, Belgium b Gembloux Agricultural University, Department of Food Technology, Passage des Déportés, 2, B-5030 Gembloux, Belgium c Gembloux Agricultural University, Department of Industrial Biological Chemistry, Passage des Déportés, 2, B-5030 Gembloux, Belgium |
| Abstract: | Homogenization has been used to release microfibrils from cellulose fibres to produce microfibrillated cellulose (MFC). Oven drying, atomization or freeze-drying were used to dry MFC. Morphological differences were observed linked to the compaction of the system and the formation of microfibril agglomerates. Thermal stability of the dried MFC, checked by TGA, decreased after homogenization and drying. Char level at the end of the pyrolysis was higher than for cellulose fibres. Derivative TGA (dTGA) showed a shoulder around 250 °C for the dried MFC. Volatile degradation product detection by FTIR spectroscopy (FTIR) coupled to TGA and DSC showed that the shoulder corresponds to expected dehydration reactions of the cellulose. Increasing the contacts between microfibril(s) (bundles) and agglomerates of the freeze-dried MFC by compression promoted dehydration reactions. Homogenization and drying modified the thermal properties of the MFC. No significant influence of freeze-drying kinetics on the thermal behaviour of the MFC was observed. |
| Keywords: | Microfibrillated cellulose Thermal properties Degradation Composites |
| 本文献已被 ScienceDirect 等数据库收录！ | |