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Rheological properties of nanocellulose suspensions: effects of fibril/particle dimensions and surface characteristics

Tobias Moberg (Institutionen för material- och tillverkningsteknik, Polymera material och kompositer) ; Karin Sahlin (Institutionen för kemi och kemiteknik, Organisk kemi) ; Kun Yao ; Shiyu Geng ; Gunnar Westman (Institutionen för kemi och kemiteknik, Organisk kemi) ; Qi Zhou ; Kristiina Oksman ; Mikael Rigdahl (Institutionen för material- och tillverkningsteknik, Polymera material och kompositer)
Cellulose (0969-0239). Vol. 24 (2017), 6, p. 2499-2510.
[Artikel, refereegranskad vetenskaplig]

The rheological properties of aqueous suspensions based on three different nanocelluloses were compared. One system was obtained via acid hydrolysis (thus yielding crystalline nanocellulose, CNC) and the other two from mechanical shearing, but from different origins and subjected to different pretreatments. Of the latter two, one was considered to be a rather typical cellulose nanofibril (CNF) suspension whereas the other was a kind of intermediate between CNF and CNC. All three nanocellulose elements differed in dimensions as evident from transmission electron microscopy and atomic force microscopy. With regard to the length of the fibrils/particles, the three nanocelluloses formed three distinct groups with lengths between 200 and slightly more than 800 nm. The three cellulosic elements were also subjected to a TEMPO-mediated oxidation yielding a similar carboxylate content in the three systems. Furthermore, the TEMPO-oxidized elements were grafted with poly(ethylene glycol) (PEG). The amount of grafted PEG was about 35 wt%. The shear viscosity, the storage modulus and the loss modulus of suspensions of the unmodified, the TEMPO-oxidized and the grafted nanocelluloses were determined at room temperature and the solids content of the suspensions was varied between 0.7 and 2.0 wt%. It was concluded that the rheological properties varied significantly between the suspensions depending on the dimensions of the cellulosic elements and their surface characteristics. In this context, the length (or the aspect ratio) of the particles played a very important role.

Nyckelord: cellulose nanocrystals, cellulose nanofibrils, rheology, surface characteristics



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Denna post skapades 2017-05-22. Senast ändrad 2017-07-04.
CPL Pubid: 249451

 

Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Polymera material och kompositer (2005-2017)
Institutionen för kemi och kemiteknik, Organisk kemi

Ämnesområden

Materialvetenskap
Nanovetenskap och nanoteknik
Hållbar utveckling
Pappers-, massa- och fiberteknik

Chalmers infrastruktur