ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
By sulfonation of poly[(maleic anhydride)-alt-styrene] in mild conditions (SO3/triethylphosphate, 298 K) a series of poly[(maleic acid)-alt-(p-sulfostyrene, styrene)] have been prepared having the same average chain length but various content of p-sulfostyrene units (from 18 to 83 mol %). A behavior of diluted aqueous solutions of two polyelectrolyte series (polyacids and Na-salts) has been compared, using viscosimetric, conductometric, and potentiometric measurements, and taking into consideration the degree of sulfonation and the kind of counterions (H+, Na+). Although the values of intrinsic viscosities [η] and equivalent conductivities λ of two copolymer series belong to two different ranges, in polyacid series they increase with increasing the degree of sulfonation, while in Na-salt series they decrease. According to the potentiometric titration and reduced viscosity data, the intensity of conformational chain transitions of sulfonated polycids also decreases with increasing the degree of sulfonation. The noticed effects are related to structural characteristics of functional copolymers, gradual increase of a charge density along the chains, lower mobility of the Na-salts, and to a diminished hydrophobicity of styrene units due to sulfonation. © 1995 John Wiley & Sons, Inc.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1995.070581106
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