Cellulose is carbon-neutral polymer material and abundant in nature. Cellulose and its derivatives have been expected as functional materials to replace petroleum derived materials. By the chemical modification of the hydroxyl groups of cellulose, functional cellulose derivatives will be developed. One of the promising cellulose derivatives is a polycation in which a cation is introduced as a pendant group. Cationic celluloses with various anion species will be easily obtained by anion exchange reactions. We prepared cationic celluloses with Br anion and bis(trifluoromethylsulfonyl)amide (TFSA) anion. It was revealed that the hydrophilicity of cationic celluloses was controllable by changing the anion structure. In this study, cationic celluloses introduced imidazolium cations with various side chain lengths, 1-methyl-3-imidazolio-deoxy-acetyl-cellulose (MIMCA-Br), 1-butyl-3-imidazolio-deoxy-acetyl-cellulose (BIMCA-Br), and 1-octyl-3-imidazolio-deoxy-acetyl-cellulose (OIMCA-Br), were synthesized, and their properties were evaluated. For obtaining these cationic celluloses, an anion exchange reaction was carried out to exchange Br anions for TFSA anions. For TFSA-based cationic celluloses, TG and contact angle measurements were conducted. The thermal stability of cationic celluloses with TFSA anion was higher than that of cationic celluloses with Br anion. The 5% weight loss temperatures of MIMCA-TFSA, BIMCA-TFSA, and OIMCA-TFSA were 252, 256, and 242<sup>ο</sup>C, respectively. The side chain length of imidazolium cation did not affect the thermal stability of cationic celluloses. The water contact angles of MIMCA-TFSA, BIMCA-TFSA, and OIMCA-TFSA were 66, 80, and 86<sup>ο</sup>, respectively. The hydrophobicity of cationic celluloses increased with increasing the alkyl side chain length.

Synthesis and evaluation of cationic cellulose (IV): Effect of side chain length of cation on properties

256th National Meeting (2018)

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