Microfibrillated cellulose: morphology and accessibility
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
- Journal Information:
- J. Appl. Polym. Sci.: Appl. Polym. Symp.; (United States), Vol. 37; Conference: 9. cellulose conference, Syracuse, NY, USA, 24 May 1982
- Country of Publication:
- United States
- Language:
- English
Similar Records
Xylan Is Critical for Proper Bundling and Alignment of Cellulose Microfibrils in Plant Secondary Cell Walls
Surface-modified and oven-dried microfibrillated cellulose reinforced biocomposites: Cellulose network enabled high performance
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
09 BIOMASS FUELS
CELLULOSE
CHEMICAL PROPERTIES
PHYSICAL PROPERTIES
ACETYLATION
CELLULASE
CHEMICAL PREPARATION
ENZYMATIC HYDROLYSIS
FIBERS
GELS
METHYLATION
MORPHOLOGY
OXIDATION
PAPER
PHOTOMICROGRAPHY
POLYMERIZATION
RAYON
SCANNING ELECTRON MICROSCOPY
SLURRIES
SURFACE AREA
THERMODYNAMIC ACTIVITY
USES
VISCOSITY
WOOD
ACYLATION
CARBOHYDRATES
CHEMICAL REACTIONS
COLLOIDS
DECOMPOSITION
DISPERSIONS
ELECTRON MICROSCOPY
ENZYMES
GLYCOSYL HYDROLASES
HYDROLASES
HYDROLYSIS
LYSIS
MICROSCOPY
MIXTURES
O-GLYCOSYL HYDROLASES
ORGANIC COMPOUNDS
PHOTOGRAPHY
POLYSACCHARIDES
SACCHARIDES
SOLVOLYSIS
SURFACE PROPERTIES
SUSPENSIONS
SYNTHESIS
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989)