Charging Behavior and Stability of the Novel Amino Group Containing Cellulose Ester Cellulose-4-[N-methylamino]butyrate Hydrochloride (CROSBI ID 245788)
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Podaci o odgovornosti
Salomao Pinto Zarth, Cintia ; Zemljič Fras, Lidija ; Čakara, Duško ; Bračič, Matej ; Pfeiffer, Annett ; Stana-Kleinschek, Karin ; Heinze, Thomas
engleski
Charging Behavior and Stability of the Novel Amino Group Containing Cellulose Ester Cellulose-4-[N-methylamino]butyrate Hydrochloride
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.
Aminocellulose ; Titration ; Potentiometric ; Protonation ; Polysaccharide ; Polyelectrolyte ; pK ; Charging
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Podaci o izdanju
213 (16)
2012.
1669-1676
objavljeno
1022-1352
1521-3935
10.1002/macp.201200057