Abstract
As a change in molecular conformation or in molecular bending property of polyelectrolytes with hydrogen ion concentration was noticeable, polyelectrolyte complexes (PEC) were prepared by mixing [2- (diethylamino)ethyl]dextran hydrochloride (EA) and sodium poly (styrenesulfonate)(NaSS) having especially large bending property at different hydrogen ion concentrations and in different order of dropping.
A coagulation curve of PEC in solution was found to vary in order of dropping. The PEC prepared with a same mole ratio SIN of mixture solution at a termination of coagulation was similar in structure, especially in compOsition ratio of two components, irrespective of an order of dropping, whereas the PEC prepared with a different mole ratio SIN and at a high hydrogen ion concentration showed a high composition ratio SIN in the PEC, and it was found to be similar to that prepared from EA and sodium dextran sulfate (DS), having small bending property reported in the previous paper. The IR spectroscopy, elemental analyses, and solubilities of PEC, revealed that the structure and properties of PEC prepared at a high hydro gen ion concentration, were different from those of PEC prepared at a low hydrogen ion concentration. It appeared that the bonds between SO3H and OH groups in PEC were formed at a gigh hydrogen ion concentration. Moreover, the molecular conformation of this PEC was found to differ from that prepared from of EA and DS. This would be a change in degree of dissociation of DS and NaSS with hydrogen ion concentration and in difference in the extent of bending property of DS and NaSS.
