Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   May-June 2004 , Volume 13 , Number 3; Page(s) 235 To 240.
 
Paper: 

ON ENZYMATIC DEGRADATION OF CELLULOSE ACETATE

 
 
Author(s):  OLARU L.*, OLARU N., POPA V.I.
 
* Institute of Macromolecular Chemistry "Petru Poni", Aleea Gr. Ghica-Voda 41A, Iasi-6600, Romania
 
Abstract: 

Cellulose acetates (CA) with different degrees of substitution (DS) and different distribution of substituents within the anhydroglucose unit (AGU) have been synthesized in conventional (acetic acid/water) and unconventional (toluene or benzene/acetic acid /water) media, and their susceptibility to enzymatic attack has been investigated using a purified cellulase from Trichoderma reesei. The degradation experiments have been carried out in heterogeneous (water suspension) or homogeneous (water solution) conditions, in dependence of the DS of the derivatives. The behaviour of CAs to enzymatic attack has been correlated with their structural characteristics which are dependent on the procedure used for their synthesis. CA Samples with DS above 1.3 have been treated with enzyme in water suspension for 14 days. It has been observed that the decrease of the reduced viscosities of these acetates solutions in adequate solvents after the enzymatic treatment depends on the procedure and conditions employed for their synthesis. Gel permeation chromatograms show some associations of macromolecules for polymers with DS higher than 1.3. These fractions of apparent high degree of polymerization seem to be preferentially degraded by the enzyme. Water-soluble cellulose acetates undergo similar degradation, irrespective of the reaction medium used for their synthesis.

 
Keyword(s): CELLULOSE ACETATE, ENZYMATIC DEGRADATION, VISCOSITY, DEGREE OF SUBSTITUTION, SYNTHESIS
 
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