ISSN:
1435-1528
Keywords:
Key words Cellulose
;
N-methylmorpholine N-oxide (NMMO)
;
rheology
;
processing
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s003970050096
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