In Bermocoll EHEC, the hydroxyl groups are modified with ethyl and ethylene oxide substituents. The properties of cellulose ethers are determined by the type of substituents, and also by their number and distribution along the molecule chain.
Bermocoll MEHEC is a methyl ethyl hydroxyethyl cellulose. The number of methyl groups corresponds closely to those found on MHPC or MHEC grades currently available. In addition, a low amount of ethyl substitution is present on the molecule.
The chemical modification results in significantly changed characteristics with regard to solubility, surface activity, chemical resistance and enzyme resistance. In this way, it is possible to produce sets of cellulose ethers with carefully calculated performance characteristics.
You can vary hydrophobicity by altering the ratio of methyl and ethyl substituents in combination with hydrophobic hydroxyethyl substituents.
The base of Bermocoll products is cellulose, one of the the world's most common natural polymers. In manufacturing Bermocoll, purified cellulose is activated in a first step with sodium hydroxide solution. In this alkalization reaction, the structures of crystalline areas – results of hydrogen bonds between the -OH groups on different chains – are expanded, allowing the hydroxyl groups to be transformed into alcoholate. This cellulose alcoholate is termed alkali cellulose.
We have a strong RD&I organization with the capabilities to maximize the benefits of Bermocoll in your application.