Structural characteristics of cellulose esters with different degrees of substitution

In this article, structural characteristics of amorphous mono-, di-, and tri-substituted esters cellulose have been studied. These were synthesized under homogenous conditions using anhydrides various aliphatic acids. The specific gravity the highly substituted samples was measured by a pycnometric method in aqueous medium. To calculate molar, Van der Waals, free volumes, as well packing coefficient esters, additive contributions partial volumes atoms atom groups polymers used. Based on molar volume, also values calculated. coincidence calculated experimental shown. addition, relationship between glass transition temperature volume found for cellulose. theoretical equations derived, which provide predicting with different degrees substitution.