INTERACTIONS BETWEEN CELLULOSE TRIACETATE FIBER AND ORGANIC SOLVENTS

Interactions between cellulose triacetate fiber and organic solvents are discussed with regard to the swelling behavior of cellulose triacetate fiber in many kinds of organic solvents involving chlorinated hydrocarbons such as trichioroethylene, tetrachloroethylene and 1, 1, 1-trichloroethane, important media for solvent dyeing and finishing. Results obtained were as follows:(1) The results on the equilibrium swelling of cellulose triacetate fiber in solvents showed that the interactions between cellulose triacetate fiber and solvent can be interpreted mainly by dipole force and two kinds of hydrogen bonds in which the solvent behaves as a proton accepter and a proton donor.(2) The diffusion behavior of solvents in cellulose triacetate fiber involves several kinds of unusual behavior. These are explained by the relaxation of the substrate structure interacting with solvent and the instantaneous internal stress caused by swelling.(3) From the relationship between the activation energy of diffusion and molecular volume of solvents, it is assumed that dispersion force and π-type hydrogen bond act between cellulose triacetate fiber and solvent.