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Water‐soluble polymers with styrenesulfonate and maleic acid units in the backbone
Author(s) -
Bortel Edgar,
Kochanowski Andrzej,
Witek Ewa
Publication year - 1994
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1994.021950729
Subject(s) - maleic acid , copolymer , chemistry , potentiometric titration , polymer chemistry , aqueous solution , sulfonic acid , monomer , sulfonate , polyelectrolyte , titration , acid–base titration , solvent , ionic strength , titration curve , polymer , sodium , inorganic chemistry , organic chemistry , ion
The radical copolymerization of maleic acid (MAc) with sodium p ‐styrenesulfonate (sodium 4‐vinylbenzenesulfonate) (NaSS) in aqueous solution yielded copolymers containing both: carboxylic and sulfonic groups attached to the backbone. By changing initiator concentrations and temperatures, the weight‐average molecular weights, M̄ w , were tailored in the range between 83 · 10 3 and 265 · 10 3 . The corresponding intrinsic viscosities extended from 0,270 to 810 cm 3 /g, giving rise to the Mark‐Houwink equation: [η] = 7,65 · 10 −6 · M 0,924 solvent aqueous 0,1 M NaCl; (25°C). The highest degree of conversion at the conditions employed amounted to 83%. Based on the sulfur content found analytically, an equal share of both monomeric units was established. The structure of the copolymer poly[(maleic acid)‐ co ‐(sodium p ‐styrenesulfonate)] obtained was elucidated by means of 13 C NMR, 1 H NMR and IR spectroscopy. After converting the sulfonate groups to their H + ‐form through ion exchange, the copolymer was submitted to potentiometric 0,1 M NaOH titration yielding a d E /d V vs. α curve (with E electromotive force, V volume of titrant and α degree of neutralization), which deviates in shape from theoretical expectations. This deviation was attributed to high ionic strength within the polymeric coils.