Modification of the Surface Properties of Cellulose Diacetate by Perfluoroacylation

Abstract

Cellulose diacetate was perfluoroacylated by straight-chain perfluoroalkanoyl chlorides, n-C_nF_2n+1COCl (n=4, 6, or 8), and by oligo(hexafluoropropene oxides), C_3n-1F_6n-1O_n-1COF (n=2, 3, 4, or 5). Critical surface tention values for the films prepared by these perfluoroacylated cellulose diacetates thus obtained were determined as γe 20∼21dyn/cm. In general, sufaces carrying a oligo(perfluoro ether) fraction gave lower γe values than those carrying a straight-chain perfluoroalkyl group with the same number of fluorine atoms.