Hard to remove water in cellulose fibers characterized by high resolution thermogravimetric analysis - methods development
A new method is applied to classify water, termed ‘hard-to-remove (HR) water’, in a cellulosic fiber and water system from an isothermal thermogravimetric analysis (TGA). The hard-to-remove (HR) water content is defined as the moisture ratio (g of water / g of dry sample) of the fiber-water system at the transition between the constant rate zone and the falling rate zone of evaporative change in mass. Specific experimental conditions have been defined for an appropriate measurement of the HR water content. The HR water content was correlated with measurable characteristics of cellulosic fibers including water retention value and freeness. The new TGA protocol can be performed on extremely small samples as a convenient and insightful characterization technique for cellulosic fibers.
KeywordsBound water Cellulose fibers Freeness Hard-to-remove water TGA Thermogravimetric analysis Water retention value
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The authors thank TA Instruments for making their TGA and DSC instruments available for this research. This study was funded by a generous grant from Procter & Gamble. We would like to thank Prof. M.A. Hubbe for his valuable comments.
- Maloney T., Johansson T. and Paulapuro H. (1998). Removal of water from the cell wall during drying. Paper Technology. July: 2–8Google Scholar
- McIntosh D.C. (1967). The effect of refining on the structure of the fiber wall. TAPPI J. 55(10):482–488Google Scholar
- Nakamura K., Hatakeyama T. and Hatakeyama H. (1981). Studies on bound water of cellulose by differential scanning calorimetry. Textile Research J. 51(9):607–613Google Scholar
- Ölander K., Hyun M and Gren U. (1994). Specific surface area - An important property of mechanical pulp. J. Pulp Paper Sci. 20(11):J338–342Google Scholar
- Polat O. and Mujumdar A.S. (1995). Drying of pulp and paper (chapter 28). In: Mujumdar A.S. (eds). Handbook of industrial drying. Marcel Dekkar Inc., New YorkGoogle Scholar
- Scallan A.M. and Carles J.E. (1972). Correlation of water retention value with fiber saturation point. Svensk Paperstidn. 75(17):699–703Google Scholar
- Scandinavian test methods: SCAN-C 62:00. 2000. Water retention value of chemical pulp. Nordic Standardization Programme.Google Scholar
- TAPPI test methods: T227 om-94. 2002. Freeness of pulp (Canadian standard method). TAPPI pressGoogle Scholar
- Welf E.S., Venditti R.A., Hubbe M.A. and Pawlak J.J. 2005. The effect of heating without water removal and drying on the swelling as measured by water retention value and degradation as measured by intrinsic viscosity of cellulose papermaking fibers Prog. Paper Recycling 14(3): 5–13Google Scholar
- Zhang M., Hubbe M.A., Venditti R.A. and Heitmann J.A. 2004. Effects of sugar addition before drying on the wet flexibility of redispersed kraft fibers. J. Pulp Paper Sci. 30(1): 29–34Google Scholar