Abstract
Pressure–volume–temperature (PVT) measurements of α-cellulose with different water contents, were performed at temperatures from 25 to 180 °C and pressures from 19.6 to 196 MPa. PVT measurements allowed observation of the combined effects of pressure and temperature on the specific volume during cellulose thermo-compression. All isobars showed a decrease in cellulose specific volume with temperature. This densification is associated with a transition process of the cellulose, occurring at a temperature defined by the inflection point T t of the isobar curve. T t decreases from 110 to 40 °C with pressure and is lower as moisture content increases. For isobars obtained at high pressures and high moisture contents, after attaining a minimum, an increase in volume is observed with temperature that may be related to free water evaporation. PVT α-cellulose experimental data was compared with predicted values from a regression analysis of the Tait equations of state, usually applied to synthetic polymers. Good correlations were observed at low temperatures and low pressures. The densification observed from the PVT experimental data, at a temperature that decreases with pressure, could result from a sintering phenomenon, but more research is needed to actually understand the cohesion mechanism under these conditions.
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Acknowledgments
The authors would like to thank The French National Research Agency (ANR) and the Competitive Cluster for the Agricultural and Food Industries in South-West France (AGRIMIP), for funding this research.
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Jallabert, B., Vaca-Medina, G., Cazalbou, S. et al. The pressure–volume–temperature relationship of cellulose. Cellulose 20, 2279–2289 (2013). https://doi.org/10.1007/s10570-013-9986-3
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DOI: https://doi.org/10.1007/s10570-013-9986-3