Conformational properties and complex formation ability of poly(methacrylic acid)‐block‐poly(1‐methyl‐4‐vinylpyridinium chloride) in aqueous solution

Abstract

It is shown that the block-like structure of the polyampholyte polfimethacrylic acid)block-poly( 1-methyl4vinylpyridinium chloride) considerably influences its conformational behaviour. This specific behaviour is explained by the formation of intra-macromolecular polyelectrolyte complexes stabilized by cooperative ionic contacts between acidic and basic units near the isoelectrlc point (i.e.p.). The structure of the block-polyampholyte at the i.e.p. is suggested to be close to the structure of non-stoichiometric polyelectrolyte complexes. The complex formation ability of the block-polyampholyte with respect to anionic, cationic, and nonionic polymers is also studied. By means of potentiometric, conductometric, and viscometnc methods the composition of interpolymer complexes is determined and the degree of conversion in complex formation reactions is calculated. The water solubility (or insolubility) of interpolymer complexes is determined by the length of acid or basic blocks. It is proposed that a dissociation of interpolymer complexes into their individual components takes place at the i. e. p. of the blockpolyampholyte.

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

“…This is consistent with earlier work reporting the synthesis of PMAA-blockP1ME4VPCl via living PTBMA. [16] In a synthesis performed by Creutz and Jérôme, the reaction temperature could be elevated (0 8C) compared to common anionic polymerizations in THF as the solvent was a 9 : 1 pyridine/THF mixture with pyridine being a solvent for 4VP. Polymerizing TBMA with living 4VP resulted in a rather narrowly distributed block copolymer (M -w /M -n = 1.15), although the reaction was found to be very sensitive to impurities.…”

Oppositely charged polyelectrolytes grafted onto planar surface: Mean-field lattice theory

“…Later, it was found that a more complicated behaviour appears when the surface is uncharged and when opposite charges reside on the grafted polymers themselves [21]. Synthesis of diblock polyampholytes and examination of their solution properties have been made for some time [22][23][24][25], but no investigations on grafted diblock polyampholytes are yet reported.…”

Natural and Synthetic Polyampholytes, 2

“…[60,61] A phase diagram of block polyampholyte/cationic polyelectrolyte as a function of IPC concentration and pH is represented in Figure 3. The system exists in three states: solution, microgel, and precipitate.…”