What is MFC?
From a chemical point of view, MFC is a polymer consisting of cellobiose monomers that are put together by β-1,4-glycosidic bonded glucose molecules (saccharide).
For more information have a look at our Blog.
What is the difference between bacterial cellulose, CNC and MFC?
Cellulose nanocrystals (CNC) are produced by hydrolysis of the amorphous region of the fibrils. Thus, crystalline nanoparticles with needle/whisker like shapes are obtained that can self-assemble and have birefringence.
Microfibrillated cellulose are long, thin fibrils that consist of amorphous and crystalline regions and form a network. They are produced by mechanical treatment with or without enzymatic or chemical pretreatment.
What is the difference between MFC, CMF, CNF, nanocellulose and other synonyms?
Often microfibrillated cellulose (MFC), nanofibrillated cellulose (NFC), cellulose microfibrils (CMF), cellulose nanofibrils and nanocellulose refer to the same material.
The confusion with nano- and microfibrillated cellulose comes from the dimension of the fibril. On the one hand the diameter of the fibrils is only several nanometers thick, on the other hand the length is in the micrometer range. So depending on which dimension the focus lays on, the product is named differently.
The term nanocellulose should never be used to describe a material because it is often used as an umbrella term and includes nanocrystalline and bacterial cellulose as well.
We’ll always refer to our products as MFC.
Is MFC dangerous for the health?
Is there an ISO/DIN standard for MFC?
What is the difference between the products?
How can I decide which products fit my needs best?
What is the price of the products?
How do I request a product sample?
What is the Weidmann production capacity?
Why does Weidmann deliver MFC only as a slurry or paste and not dry?
What are the CAS number and INCI term?
What is the E-number?
What is the customs tariff number?
What MFC properties can be generated through the Weidmann production process?
What is the composition of MFC?
What is the influence of water quality on MFC?
What functional groups are present on the surface of the microfibrils?
Is it possible to modify the MFC?
Why do the water dispersed products look like a gel/yoghurt/paste?
Can I further concentrate the water dispersed products in my lab, and how?
Can I dry and redisperse the water dispersed products?
There are possibilities with chemical modifications, please contact us for further technical discussions.
What is the maximum solids content I can get without loosing quality?
What are solvents for MFC?
Non-derivatizing solvents dissolve the cellulose by intermolecular forces only. In aqueous media inorganic complexes (e.g. Cuam, Cuen), bases (e.g. 10% NaOH), mineral acids and melts of inorganic salt hydrates can be used.
To dissolve cellulose in non-aqueous media following mixtures are recommended: organic liquid/inorganic salt (e.g. N,N Dimethyllacetamide/LiCl), organic liquid/amine/SO2 (e.g. Dimethylsulfoxide/Triethylamine/SO2) and ammonia/ammonium salt (e.g. NH, NH4SCN).
For derivatizing solvents dissolution occurs in combination with formation of “unstable” ether, ester, or acetal derivatives that can be reversed by changing pH or solvent.
Examples for common solvents that dissolve cellulose are DMS, DMSO, THF. Furthermore, trifluoroacetic acid, formic acid and N,N Dimethylformamide/N2O4 are recommended.
Source: Heinze, T.; Koschella, A. – Solvents applied in the field of cellulose chemistry – A mini review