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Extensional viscosity of microfibrillated cellulose suspensions

Tobias Moberg (Institutionen för material- och tillverkningsteknik, Polymera material och kompositer) ; Mikael Rigdahl (Institutionen för material- och tillverkningsteknik, Polymera material och kompositer) ; Mats Stading (Institutionen för material- och tillverkningsteknik, Polymera material och kompositer) ; Emma Levenstam Bragd
Carbohydrate Polymers (0144-8617). Vol. 102 (2014), p. 409-412.
[Artikel, refereegranskad vetenskaplig]

The extensional properties of micro fibrillated cellulose (MFC)-suspensions at different fibril concentrations and with different amounts of added sodium chloride were evaluated. The MFC-suspensions were obtained by diluting a stock solution consisting of 0.95 wt.% cellulose with either deionized water or sodium chloride solution, giving a series of different concentrations and sodium chloride contents. The extensional viscosities of the suspensions were measured utilizing contraction flow geometry. Here the specimens were forced through a hyperbolic nozzle and the required pressure drop over the nozzle was measured. The extensional viscosity exhibited an extensional-thinning behaviour over the extensional strain rates used. Furthermore the extensional viscosity decreased with decreasing concentration of the suspensions, in similarities with the shear properties of the specimens. For the suspensions containing sodium chloride, the extensional viscosity appeared to increase when the concentration of sodium chloride was increased. But excessive amounts of added sodium chloride promoted an agglomeration of the suspensions.

Nyckelord: microfibrillated cellulose, reologi, extensional viscoity, suspensions

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Denna post skapades 2014-03-27. Senast ändrad 2014-10-27.
CPL Pubid: 195753


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