SYNTHESIS OF FUNCTIONAL POLYMER MATERIAL WITH POLYPHENOLIC ACID (I)—— Esterification of Gallic Acid with Cellulose and Functional Test of Product

A new functional polymer material, namely galloylcellulose, was synthesized with gallic acid as functional group, and cellulose as molecular skeleton. Gallic acid was firstly acetylized with acetic anhydride to protect phenolic groups, then reacted with SOCl2 or PCl5 to prepare intermediate tricetyl-galloylchloride, in which the yields were 80% and 90% respectively. Taking pyridin as catalyst, the intermediate was esterified with cellulose. After deacetylating, the target product, galloylcellulose, was obtained with esterification ratio of 43.6%. Functional test results indicated that 1 g of galloylcellulose can adsorb 65.5 mg gelatin, or complex 76.5 mg Fe3+. The desorption ratio was about 98%. Galloylcellulose is reusable and stable in dilute acidic, ethanolic solutions and hot water. This study established groundwork for further developing commercial product of the new functional polymer material which can be used in brewing process to adsorb proteins and complex heavy metal ions.