J. Koetz et S. Kosmella, INTERACTIONS BETWEEN POLY(DIALLYLDIMETHYLAMMONIUM CHLORIDE) AND POLY(ACRYLIC ACID) IN DEPENDENCE ON POLYMER CONCENTRATION, Nuovo cimento della Societa italiana di fisica. D, Condensed matter,atomic, molecular and chemical physics, biophysics, 16(7), 1994, pp. 865-871
The phase diagram of ternary system, i.e. poly(diallyldimethylammonium
chloride), poly(acrylic acid, sodium salt), and water was investigate
d by varying the molecular weight of the components. In general, a ran
ge of phase separation is surrounded by a one-phase system. The range
of phase separation can be subdivided into a region of flocculation an
d/or co-acervation in contrast to stable symplex dispersions. By incre
asing the molecular weight of the components the range of phase separa
tion is increased and phenomena of flocculation followed by coacervati
on were observed predominantly. Above a molecular weight of 10 000 g/m
ol the transition to concentrated macroscopic homogeneous one-phase sy
stems was observed at a constant ionic strength of 2 mol/l coinciding
with the critical ionic strength for Coulombic interactions in this sy
stem. That means the transition to concentrated one-phase systems can
be understood by the disappearance of Coulombic forces above a system-
specific ionic strength resulting in a quite additive behaviour of the
mixtures with regard to the components.