Rheological behavior of cellulose/monohydrate of n-methylmorpholine n-oxide solutions Part 1: Liquid state |
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Authors: | Jean-François Blachot Nathalie Brunet Patrick Navard J-Y Cavaillé |
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Institution: | (1) GEMPPM –CNRS UMR #5510 INSA de Lyon 69621 Villeurbanne cedex France E-mail: cavaille@gemppm.insa-lyon.fr, FR;(2) Ecole des Mines de Paris Centre de Mise En Forme des Matériaux URA CNRS 1374 BP207 06904 Sophia Antipolis France, FR |
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Abstract: | Steady-state and dynamic experiments have been performed on solutions containing cellulose dissolved in monohydrate of N-methylmorpholine
N-oxide (NMMO). The dependence of the zero-shear viscosity η0, and of the terminal relaxation time τ
c
, on concentration, average degree of polymerization (DP) and temperature are discussed. The behavior of this semi-rigid,
polymolecular polymer in solution differs from that of flexible monodisperse ones. The slope of the plot of log(η0) versus, on the one hand, log(c) at fixed molecular weight (DP)=600, and, on the other hand, log(DP) at fixed concentration (c=5%w/w) are equal to 4.6 and 5 respectively, instead of 3.4 in the concentrated region. Experimental data for the shear modulus
were fitted using the classical Doi-Edwards equation with a log normal distribution of relaxation time. This distribution
is compared to the distribution of DP.
Received: 25 February1997 Accepted: 30 December 1997 |
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Keywords: | Cellulose N-methylmorpholine N-oxide (NMMO) rheology processing |
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