Chain dynamics and thermal stability of trifluoroacetylated ethyl cellulose

摘要

Trifluoroacetyl ethyl cellulose (TFAEC) was prepared by reaction of ethyl cellulose (EC) with trifluoroacetic anhydride. The effect of the trifluoroacetylation on the chain dynamics and thermal stability of the ethyl cellulose was investigated. Chain dynamics of TFAEC were investigated using the 1H spin-lattice relaxation time in the rotating frame (T~H_1p). The trifluoroacetylation reduced the mobility of the polymeric glucose chain. The apparent activation energies (E_a) of degradation under nitrogen and air were evaluated by differential and integral methods. The value of Ea of TFAEC under nitrogen was affected by the equivalent ratio of trifluoroacetic anhydride to EC, while that under air was less affected.