ISSN:
1022-1352
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
The formation of polyelectrolyte complexes (PEC) between linear or crosslinked poly[4-(but-3-en-1-ynyl)-1-methylpiperidin-4-ol] and linear as well as crosslinked poly(acrylic acid) and poly(methacrylic acid) was studied by potentiometric, conductimetric, turbidimetric, viscometric and volumetric methods in aqueous solution. The composition of PEC particles depends on the conformational state of the interacting macromolecules. The destruction of PEC particles into the individual components takes place at an ionic strength μ 〉 1 × 10-2 mol/L. The addition of organic solvents causes the conformational transition of PEC particles from the compact structure to an extended one. The sorption of linear polyelectrolytes by networks is accompanied by the shrinking of the polyelectrolyte gels. The kinetics of sorption increases with increasing temperature, ionic strength of the solution and ionization degree. The destruction of PEC consisting of oppositely charged linear and crosslinked polyelectrolytes takes place at high ionic strength of the external solution. The completeness of interpolyelectrolyte reactions with participating of linear and crosslinked poly[4-(but-3-en-1-ynyl)-1-methylpiperidin-4-ol] was detected by the disappearance of the Bohlman band at 2 800 cm-1. The kinetics of sorption of linear polyelectrolytes by crosslinked polyelectrolytes as well as of the competition reaction which is accompanied by the destruction of PEC composed of oppositely charged linear and crosslinked polyelectrolytes was also studied.
Zusätzliches Material:
8 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/macp.1997.021980114
