Rheologica Acta

, Volume 54, Issue 11–12, pp 941–949 | Cite as

Effects of process variables on the yield stress of rheologically modified biomass

Original Contribution


Additives that alter the rheology of lignocellulosic biomass suspensions were tested under conditions of variable pH, temperature, and solid concentration. The effects of certain ions, biomass type, and time after the addition of rheological modifier were also examined. Torque and vane rheometry were used to measure the yield stress of samples. It was found that the effectiveness of rheological modifiers depends on pH over a range of 1.5 to 6, biomass type, concentration of certain ions, and time after addition. The time-dependent properties of rheologically modified biomass are sensitive to the type of rheological modifier, and also to mixtures of these additives, which can result in unexpected behavior. We show that time-dependent rheology is not correlated with time-dependent changes of the water-soluble polymer (WSP) in the aqueous environment, such as slow polymer hydration, suggesting that time-dependent changes in the polymer-fiber interaction may play a more significant role.


Lignocellulosic biomass Rheology Rheological modifier Mixing Yield stress Corn stover 



This project was supported by the US Department of Agriculture (NRI award number 2006-35504-17401 and AFRI award number 2010-65504-20406).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.University of Wisconsin-MadisonMadisonUSA
  2. 2.USDA Forest ServiceMadisonUSA

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