Microfibrillated cellulose: morphology and accessibility

Conference · Sat Jan 01 04:00:00 EST 1983 · J. Appl. Polym. Sci.: Appl. Polym. Symp.; (United States)

OSTI ID:5039044

Herrick, F W; Casebier, R L; Hamilton, J K; Sandberg, K R

Microfibrillated cellulose (MFC) is prepared by subjecting dilute slurries of cellulose fibers to repeated high-pressure homogenizing action. A highly microfibrillated product will have a gel-like appearance at 2% concentration in water. Such gels have pseudoplastic viscosity properties and are very fluid when stirred at high shear rate. The relative viscosity of 2% MFC dispersions may be used as a measure of the degree of homogenization or microfibrillation of a given wood cellulose pulp. The water retention value of an MFC product can also be used as an indicator for degree of homogenization. Structurally, MFC appears to be a web of interconnected fibrils and microfibrils, the latter having diameters in the range 10-100 nm as observed in scanning and transmission electron micrographs. Chemical studies have revealed that MFC is only moderately degraded, while being greatly expanded in surface area. The accessibility of cellulose in MFC is only moderately degraded, while being greatly expanded in surface area. The accessibility of cellulose in MFC toward chemical reagents is greatly increased. Higher reactivity was demonstrated in dilute cupriethylenediamine solubility, triphenylmethylation, acetylation, periodate oxidation, and mineral acid and cellulase enzyme hydrolysis rates. 16 references, 8 figures, 7 tables.

• Research Organization: ITT Rayonier Inc., Shelton, WA
• OSTI ID: 5039044
• Report Number(s): CONF-8205234-Vol.2
• Conference Information: Journal Name: J. Appl. Polym. Sci.: Appl. Polym. Symp.; (United States) Journal Volume: 37
• Country of Publication: United States
• Language: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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ACETYLATION
ACYLATION
CARBOHYDRATES
CELLULASE
CELLULOSE
CHEMICAL PREPARATION
CHEMICAL PROPERTIES
CHEMICAL REACTIONS
COLLOIDS
DECOMPOSITION
DISPERSIONS
ELECTRON MICROSCOPY
ENZYMATIC HYDROLYSIS
ENZYMES
FIBERS
GELS
GLYCOSYL HYDROLASES
HYDROLASES
HYDROLYSIS
LYSIS
METHYLATION
MICROSCOPY
MIXTURES
MORPHOLOGY
O-GLYCOSYL HYDROLASES
ORGANIC COMPOUNDS
OXIDATION
PAPER
PHOTOGRAPHY
PHOTOMICROGRAPHY
PHYSICAL PROPERTIES
POLYMERIZATION
POLYSACCHARIDES
RAYON
SACCHARIDES
SCANNING ELECTRON MICROSCOPY
SLURRIES
SOLVOLYSIS
SURFACE AREA
SURFACE PROPERTIES
SUSPENSIONS
SYNTHESIS
THERMODYNAMIC ACTIVITY
USES
VISCOSITY
WOOD