CHAIN BEHAVIOR OF AN AMPHOTERIC CELLULOSE DERIVATIVE - HYL-O-2-HYDROXY-3(TRIMETHYLAMMONIO)PROPYLCELLULOSE

The C-13 NMR spin-lattice relaxation times (T-1) of anhydroglucose uni ts vary with the number of substituents, and the T-1 values of unsubst ituted anhydroglucose units of O-carboxymethylcellulose are longer tha n those of amylose. Those results indicate that in water, the rotation al motions of anhydroglucose units of cellulose derivative are quite i mportant local motions contributing to the C-13 NMR spin-lattice relax ation, and within a cellulose chain, anhydroglucose units rotate with different degrees of freedom depending on their environment. Moreover, the C-13 NMR spin-lattice relaxation data indicate that the mobilitie s of ionic substituents are dependent on substitution positions as wel l as their ionic interaction. (C) 1995 John Wiley & Sons, Inc.