INTERMOLECULAR AND INTRAMOLECULAR IONIC INTERACTIONS OF POLYAMPHOLYTE- CARBOXYMETHYL-2-DIETHYLAMINOETHYLCELLULOSE

Carboxymethyl-2-diethylaminoethylcellulose (CM-DEAE cellulose) was pre pared by etherification of carboxymethylcellulose with diethylaminoeth yl chloride in a NaOH solution. The behaviour of CM-DEAE cellulose in aqueous solution was studied by viscosity and GPC measurements. The de gree of substitution (DS) and existing states of DEAE substituents wer e examined by the use of proton NMR, and those of the CM substituents were observed with FT-IR. The results reveal that the reduced viscosit y and apparent molecular size of CM-DEAE cellulose vary with the conce ntration of sodium chloride and changes in pH and DS. These phenomena can be explained in terms of inter- and intra-molecular ionic interact ions.