Abstract
The influence of ZnO as cellulose-8%NaOH-water solution stabilizer against gelation is studied. Cellulose intrinsic viscosity in 8%NaOH-water as a function of solution temperature is investigated in the presence and absence of ZnO. The addition of ZnO did not bring any improvement in terms of solvent thermodynamic quality. Non-dissolved ZnO particles were observed above 0.8–0.9% ZnO in 8%NaOH-water. Gelation of cellulose-8%NaOH solutions with and without ZnO are studied for various cellulose and ZnO concentrations (4–6% and 0–1.5%, respectively) in a wide range of temperatures (−5 °C to 50 °C). Gelation times were exponentially increasing with increasing ZnO concentration and with decreasing cellulose concentration and solution temperature. Gelation times of cellulose-NaOH-water-ZnO systems were found to follow a semi-empirical model correlating these three parameters. We suggest that ZnO is acting as water molecular “binder” stabilizing cellulose-NaOH-water solutions.
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Acknowledgments
The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement No. 214653. W.L. thanks Dr. Nicolas Le Moigne and Kim-Anh Le for help with rheological measurement and for fruitful discussions, and Liu Zhigang for sharing his knowledge and providing advices on nonlinear curve fitting.
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Liu, W., Budtova, T. & Navard, P. Influence of ZnO on the properties of dilute and semi-dilute cellulose-NaOH-water solutions. Cellulose 18, 911–920 (2011). https://doi.org/10.1007/s10570-011-9552-9
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DOI: https://doi.org/10.1007/s10570-011-9552-9