Interactions Between Macromolecules in Solution And by E. Tsuchida, K. Abe

By E. Tsuchida, K. Abe

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Figure 12 shows the effect of ionic strength on viscosity (a) and transmittance (b) of the mixed aqueous solution of PMAA and integral-type polycation, 2X. 0 "N f ^>t 0 a. 0 [NoCH (M) (b) Fig. 12 a, b. 5)-2X, D Poly(acrylic acid) (a = 1)-2X, A Poly(sodium styrenesulfonate)-2X Formation, Structure and Properties of Intermacromolecular Complexes 34 9 - 0 , ,, J^-* ***'^^-^~ *•*• „7 ^ so** X ENi <5 ^ < > a. 3 < < 1 n t A 1 Fig. 13. 7 M NaCl, independent of the composition of the complex. 5, the complex may readily precipitate with increasing ionic strength.

Table 5. 0 MAA*; Methacrylic acid monomer Henderson-Hasselbach equation pH = pKa - n' • log[(l - â)lâ] PMAA = poly(methacrylic acid), PEO = poly(ethylene oxide), BT, 2B, 2X, 3X and XX see Fig. 4 28 Formation, Structure and Properties of Intermacromolecular Complexes The degree of induction of the dissociation of PMAA in the presence of various polycations is estimated by its apparent dissociation constant (pKJ calculated from the Potentiometrie titration results as shown in Fig. 6, using the Henderson-Hasselbach equation (see Table 5).

PH _ increas. pH decreas. conc. decreas. pH increas. cone. Precipitate increas. n (IV1 Precipitate / *J Coacérvate increas. n M Dissociation Fig. 15. Schematic representation of the equilibrium for the phase changes of the polyfmethacrylic acid)-ionene-type polycation complex cipitates is drawn at about pH = 7. At higher pH, the composition of the complex is unity. 7, the complex coacervates are dissociated to the individual polyelectrolyte components because of the screening effect of microsalts.

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