cellulózarányszám

Cellulózarányszám refers to the specific number of a cellulose derivative that has been modified with a cyanoethyl group. This number, often expressed as a degree of substitution (DS), indicates the average number of cyanoethyl groups attached to each anhydroglucose unit of the cellulose polymer. The cyanoethylation process involves reacting cellulose with acrylonitrile in the presence of a basic catalyst. The DS value is a crucial parameter that significantly influences the physical and chemical properties of the resulting cellulose derivative, such as its solubility, thermal stability, and mechanical strength. Higher DS values generally lead to increased solubility in organic solvents and a lower glass transition temperature. Cellulózarányszám is determined through various analytical techniques, often involving titration or spectroscopy to quantify the cyanoethyl groups. These derivatives find applications in areas such as coatings, films, adhesives, and as rheology modifiers due to their unique properties, which are directly correlated to their specific cellulózarányszám.