Cellulose Trifluoroacetic acid/chlorinated alkanes

Patel, D.L. Gilbert, R.D. Lyotropic mesomorphic formation of cellulose in trifluoroacetic acid/chlorinated-alkane solvent mixtures at room temperature. J. Polym. Sci. Polym. Phys. Ed. 1981, 19 (8), 1231-1236. 

The original cellulose "solvents" (e.g. cupraammonium-hydroxide, ferric tartaiate) do not yield true solutions. Rather, complexes with cellulose are involved. More recently, several new solvents including N-methyi-morpholine-N-oxide HjO, LiCl/DMAC, liquid NH,/NH.,SCN, trifluoroacetic acid/chlorinated alkanes have been developed and liquids crystalline solutions (lyotropic mesophases) of cellulose have been obtained in them (5). 

Cellulose triacetate / left trifluoroacetic acid, trifluoroacetic acid / chlorinated alkanes... 

Patel and Gilbert demonstrated that mixtures of trifluoroacetic acid (TFA, Figure 10.4) and chlorinated alkanes, such as 1,2-dichloroethane and methylene chloride, are also good solvents for cellulose (and cellulose triacetate) [10,11]. It was discovered early that these solvents... 

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