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- W2138406729 abstract "Abstract The use of trifluoroacetic anhydride as a promoter for the preparation of mixed esters of granular starch is reported. Efficient esterification results in complete dissolution of the starch granules, which is attained without the use of an external heat source when trifluoroacetic anhydride was added incrementally to a starch slurry in the mixed carboxylic acids. Starch mixed esters are co‐acetate/butyrate, co‐acetate/hexanoate, co‐acetate/octanoate, co‐acetate/palmitate and co‐acetate/butyrate/hexanoate/octanoate/palmitate, each from a solution of the corresponding mixed acids. The products comprise a total degree of substitution > 2.5, as analyzed by gas‐liquid or high‐pressure liquid chromatographies. In each product the extent of acid substitution is the same as or close to the composition of the corresponding acid distribution in the reaction mixture. Films cast of the resulting mixed esters, together with the corresponding single acid esters, are analyzed for glass transition and tensile properties, as measured by a dynamic mechanical analyzer. Glass transition temperature and tensile modulus increase proportionally with the increased mole fraction of acetate within the starch mixed acids. Film elongation increases with increases of acyl chain length in all of the starch esters. The dependency of those properties on the relative distribution of acyl group is discussed." @default.
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- W2138406729 date "2008-03-01" @default.
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- W2138406729 title "Preparation and Physical Properties of Starch Mixed Esters" @default.
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- W2138406729 doi "https://doi.org/10.1002/star.200700692" @default.
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