Elongational and shear rheology of cellulosic and lignocellulosic solutions in N-methylmorpholine oxide monohydrate

Document Type

Article

Publication Date

1-1-2001

Abstract

Elongational and shear rheology of solutions of cellulosic and lignocellulosic materials in N-methylmorpholine oxide monohydrate (NMMO) was investigated for a variety of parameters. Both effective elongational and shear viscosity show a "thinning effect". A strong orientation effect was noticed by calculating the body forces, enthalpy and entropy of orientation. This is particularly significant at low temperatures and high deformation rates. Also, another common trend for cellulosic and lignocellulosic solutions in NMMO is the transition at about 90°, as revealed by tan δ temperature plots at different frequencies in Dynamical Mechanical Analysis measurements.

Publication Source (Journal or Book title)

Cellulose Chemistry and Technology

First Page

89

Last Page

102

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