Phase behaviour of block‐polyampholytes based on poly(methacrylic acid)‐block‐poly(1‐methyl‐4‐vinylpyridinium chloride) in aqueous salt solutions

Abstract

Recentlywe investigated the inter-polyelectrolyte reactions of poly(methacry1ic acid)-block-poly(l-methyl-4-vinylpyridinium chloride) with respect to anionic, cationic and non-ionic polymers. The complexation reactions of a block-polyampholyte with surfactants and dye molecules were also considered ').In the present communication the intra-and interpolyelectrolyte reactions of a nearly equimolar block-polyampholyte poly(methacry1ic acid)-block-poly(1-methyl-4-vinylpyridinium chloride) (1) are studied.

Intra- and Interpolyelectrolyte Complexes of Polyampholytes

“…Similar behavior was observed for nearly equimolar BPA consisting of poly(methacrylic acid) (PMAA) and poly(1-methyl-4-vinylpyridinium chloride) (P1M4VPCl) [18,88]. As seen from Figure 3 in acidic and alkaline media PMAA- b -P1M4VPCl acts as polycation and polyanion, respectively; the reduced viscosity drops with the increase in the ionic strength (µ).…”

Double-Hydrophilic Block Copolymers: Synthesis and Application as Novel Surfactants and Crystal Growth Modifiers

“…[190] The complex solubility of P1ME4VPCl-block-PMAA in dependence of pH and ionic strength was investigated and a state diagram was presented, which indicated complete complex solubility over the entire pH range between I = 0.2-0.4 due to the rupture of ionic bonds between the oppositely charged blocks. [191] For complexes consisting of this block copolymer with a polycation, a different phase behavior was found showing solubility only at low concentration and pH A 5, whereas at lower pH and low polymer concentration, a microgel was formed. High polymer concentrations always resulted in precipitation.…”

“…High polymer concentrations always resulted in precipitation. [191] P1ME4VPCl-block-PMAA with a P1ME4VPCl/PMAA ratio of 2 : 1 was also used for the preparation of polyelectrolyte surfactant complexes using the cationic surfactant cetyltrimethylammonium chloride (CTA), the anionic surfactant sodium dodecylsulfate (SDS) and the dye 8-anilino-1-naphthalenesulfonic acid (ANS) in aqueous solution. [192] Whereas CTA formed a water-soluble complex with a PMAA/CTA stoichiometry of 2 : 1 due to stabilization by the cationic block of the DHBC, the complex with SDS was insoluble in water due to the much shorter PMAA block, which could not stabilize the surfactant complex.…”

Intra- and Interpolyelectrolyte Complexes of Polyampholytes

“…Self-quenched* [15] sodium styrene sulfonate-co-4-vinylpyridine, P(NaSS-co-4VPy) Self-quenched* [16] poly(1-methyl-4-vinylpyridinium chloride)block-poly(methacrylic acid), P1M4VPCl-b-PMAA Self-quenched * [17,18] 2-acrylamido-2-methyl-1-propanesulfonic acid sodium salt-co-(3acrylamidopropyl)trimethylammonium chloride, P(AMPSNa-co-APTAC) Quenched [19] 2-methacryloyloxyethyltrimethylammoniumco-2-methacryloyloxyethanesulfonate, P(METMA-co-MES) Quenched or zwitterionic [20] 2-methacryloyloxyethyltrimethylammonium-co-2-methacryloyloxyethanesulfonate, P(METMA-co-MES) Quenched or zwitterionic [20] Poly(carbobetaine), PCB Annealed [7] Poly(sulfobetaine), PSB Quenched or zwitterionic [7] Poly(phosphobetaine), PPB Quenched or zwitterionic [7] * The term "self-quenched" for polyampholytes represents polyampholytes which possess permanently ionized charged groups (anionic or cationic) in the repeating units.…”