Charging Behavior and Stability of the Novel Amino Group Containing Cellulose Ester Cellulose‐4‐[<i>N</i>‐methylamino]butyrate Hydrochloride

Abstract

Abstract The charging behavior of water‐soluble cellulose‐4‐[ N ‐methylamino]butyrate hydrochloride (CMABH) with different degree of substitution (DS) is investigated by polyelectrolyte titration at different pH values. Samples of high DS (0.92) and low DS (0.31) exhibit a decrease in positively charged groups from pH 2 (3.9 and 1.9 mmol g −1 ) to pH 9 (0.81 and 0.65 mmol g −1 ) due to the deprotonation of the ammonium groups. The stability of the ester linkage of CMABH is examined as a function of pH value and storage time (up to 28 d). A hydrolysis of the ester moiety is evident after 2 h at pH 8, which is also proved by ATR‐FTIR‐ and Raman spectroscopy.