Publication detail

Untypical rheological behaviour of the lignite-carboxymethylcellulose-water dispersion system

KLIMOVIČ, M. PEKAŘ, M.

Original Title

Type

journal article - other

Language

English

Original Abstract

CSuspensions of lignite in a solution of a high molecular weight carboxymethylcellulose show peculiar rheological behaviour. Unless the lignite concentration is sufficiently high apparent viscosity and viscoelastic moduli of the suspension are lower than those of the pure solution. This effect is not suppressed by changing pH and seems to be common for low concentrated suspensions in solutions of high molecular weight (bio)polymer. It is explained by specific structuring of suspensions. Lignite particles at lower concentration separate long cellulose chains and facilitate their movement under shear flow. The particles loosen inter-chain contacts, disturb and release elastic gel-like structure formed by the long cellulose chains, which results, in the low strain oscillatory deformation, in decrease of the moduli and in increase of the loss angle. If the amount of lignite particles is sufficiently high suspension stiffening occurs as usual. No such effect was observed for suspensions prepared from the low molecular weight derivative.

Keywords

carboxymethylcellulose, lignite, rheology

Authors

KLIMOVIČ, M.; PEKAŘ, M.

RIV year

2007

Released

1. 1. 2007

ISBN

0303-402X

Periodical

Colloid and Polymer Science

Year of study

285

Number

State

Federal Republic of Germany

Pages from

865

Pages to

872

Pages count

BibTex

@article{BUT44523,
  author="Michal {Klimovič} and Miloslav {Pekař}",
  title="Untypical rheological behaviour of the lignite-carboxymethylcellulose-water dispersion system",
  journal="Colloid and Polymer Science",
  year="2007",
  volume="285",
  number="8",
  pages="865--872",
  issn="0303-402X"
}