Modifying the flocculation of microfibrillated cellulose suspensions by soluble polysaccharides under conditions unfavorable to adsorption

A Sorvari, T Saarinen, Sanna Haavisto, Juha Salmela, M Vuoriluoto, J Seppälä

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)

Abstract

Carboxymethylcellulose (CMC) and xanthan gum were studied as dispersants for microfibrillated cellulose (MFC) suspension using a rotational rheometer and imaging methods. The imaging was a combination of photography and optical coherence tomography (OCT). Both polymers dispersed MFC fibers, although CMC was more effective than xanthan gum. The negatively charged polymer chains increased the viscosity of the suspending medium and acted as buffers in between the negatively charged fibers. This behavior decreased the number and strength of contacts between the fibers and subsequently dispersed the flocs. The stronger separation of the fibers was reflected in the frequency sweep where the MFC/polymer suspensions had lower gel strength than pure MFC suspension. Dispersing effect was also observed in the flow measurements, where the floc size was more uniform with polymers in the decelerating flow and after long, slow constant shear, which normally induces a heterogeneous structure with large flocs into the MFC suspension
Original languageEnglish
Pages (from-to)283-292
Number of pages9
JournalCarbohydrate Polymers
Volume106
Issue number1
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Fingerprint

Flocculation
Polysaccharides
Cellulose
Suspensions
Polymers
Adsorption
Xanthan gum
Carboxymethylcellulose Sodium
Fibers
Imaging techniques
Optical tomography
Rheometers
Photography
Flow measurement
Buffers
Gels
Viscosity
xanthan gum

Keywords

  • Carboxymethyl cellulose
  • dispersant
  • microfibrillated cellulose
  • optical coherence tomography
  • rotational rheometry
  • xanthan gum

Cite this

Sorvari, A ; Saarinen, T ; Haavisto, Sanna ; Salmela, Juha ; Vuoriluoto, M ; Seppälä, J. / Modifying the flocculation of microfibrillated cellulose suspensions by soluble polysaccharides under conditions unfavorable to adsorption. In: Carbohydrate Polymers. 2014 ; Vol. 106, No. 1. pp. 283-292.
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abstract = "Carboxymethylcellulose (CMC) and xanthan gum were studied as dispersants for microfibrillated cellulose (MFC) suspension using a rotational rheometer and imaging methods. The imaging was a combination of photography and optical coherence tomography (OCT). Both polymers dispersed MFC fibers, although CMC was more effective than xanthan gum. The negatively charged polymer chains increased the viscosity of the suspending medium and acted as buffers in between the negatively charged fibers. This behavior decreased the number and strength of contacts between the fibers and subsequently dispersed the flocs. The stronger separation of the fibers was reflected in the frequency sweep where the MFC/polymer suspensions had lower gel strength than pure MFC suspension. Dispersing effect was also observed in the flow measurements, where the floc size was more uniform with polymers in the decelerating flow and after long, slow constant shear, which normally induces a heterogeneous structure with large flocs into the MFC suspension",
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Modifying the flocculation of microfibrillated cellulose suspensions by soluble polysaccharides under conditions unfavorable to adsorption. / Sorvari, A; Saarinen, T; Haavisto, Sanna; Salmela, Juha; Vuoriluoto, M; Seppälä, J.

In: Carbohydrate Polymers, Vol. 106, No. 1, 2014, p. 283-292.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Modifying the flocculation of microfibrillated cellulose suspensions by soluble polysaccharides under conditions unfavorable to adsorption

AU - Sorvari, A

AU - Saarinen, T

AU - Haavisto, Sanna

AU - Salmela, Juha

AU - Vuoriluoto, M

AU - Seppälä, J

PY - 2014

Y1 - 2014

N2 - Carboxymethylcellulose (CMC) and xanthan gum were studied as dispersants for microfibrillated cellulose (MFC) suspension using a rotational rheometer and imaging methods. The imaging was a combination of photography and optical coherence tomography (OCT). Both polymers dispersed MFC fibers, although CMC was more effective than xanthan gum. The negatively charged polymer chains increased the viscosity of the suspending medium and acted as buffers in between the negatively charged fibers. This behavior decreased the number and strength of contacts between the fibers and subsequently dispersed the flocs. The stronger separation of the fibers was reflected in the frequency sweep where the MFC/polymer suspensions had lower gel strength than pure MFC suspension. Dispersing effect was also observed in the flow measurements, where the floc size was more uniform with polymers in the decelerating flow and after long, slow constant shear, which normally induces a heterogeneous structure with large flocs into the MFC suspension

AB - Carboxymethylcellulose (CMC) and xanthan gum were studied as dispersants for microfibrillated cellulose (MFC) suspension using a rotational rheometer and imaging methods. The imaging was a combination of photography and optical coherence tomography (OCT). Both polymers dispersed MFC fibers, although CMC was more effective than xanthan gum. The negatively charged polymer chains increased the viscosity of the suspending medium and acted as buffers in between the negatively charged fibers. This behavior decreased the number and strength of contacts between the fibers and subsequently dispersed the flocs. The stronger separation of the fibers was reflected in the frequency sweep where the MFC/polymer suspensions had lower gel strength than pure MFC suspension. Dispersing effect was also observed in the flow measurements, where the floc size was more uniform with polymers in the decelerating flow and after long, slow constant shear, which normally induces a heterogeneous structure with large flocs into the MFC suspension

KW - Carboxymethyl cellulose

KW - dispersant

KW - microfibrillated cellulose

KW - optical coherence tomography

KW - rotational rheometry

KW - xanthan gum

U2 - 10.1016/j.carbpol.2014.02.032

DO - 10.1016/j.carbpol.2014.02.032

M3 - Article

VL - 106

SP - 283

EP - 292

JO - Carbohydrate Polymers

JF - Carbohydrate Polymers

SN - 0144-8617

IS - 1

ER -