Study of Structural Characteristics of Cellulose Esters with Different Degrees of Substitution

Updata:01-01-1970

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By:Michael Ioelovich

DOI: https://doi.org/10.30564/opmr.v4i1.4805

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

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