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Effect of cationic surfactants on titration behavior of isotactic and atactic poly(methacrylic acid)
ID Kogej, Ksenija (Avtor), ID Dannert, Corinna (Avtor), ID Graf-Vlachy, Nina (Avtor), ID Dias, Rita S. (Avtor), ID Reščič, Jurij (Avtor)

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Izvleček
By forming strong complexes with oppositely charged polyelectrolytes, cationic surfactants significantly affect their solution properties. We investigated the effect of bound surfactant on the titration behavior of two isomer forms of poly(methacrylic acid), PMA, atactic and isotactic PMA, aPMA and iPMA, respectively, which are known for the cooperative change in chain conformation in water. The bound surfactant micelles increase the initial degree of ionization, α, of carboxyl groups on PMA, shift the conformational transition to higher α and make it narrower, and exclude the complexed chains from the solution. The titration curves were analyzed in the framework of the Henderson-Hasselbalch theory and the Gibbs free energy change of the conformational transition was calculated. The results were discussed in the context of a complex influence of surfactant on the PMA chain conformation in solution. It is proposed that the PMA-surfactant interaction changes from a so-called hydrophobic mode, which is responsible for the solubilization of the unionized and water-insoluble iPMA at low α, to a predominantly electrostatic one at high α, which leads to the precipitation of both aPMA and iPMA from solution. Constant pH simulations using simple coarse-grained models for the PMA polymers and individual surfactants were performed to rationalize the titration behavior of PMAs in the absence and presence of surfactant. By inducing an attractive interaction between PMA monomers, an excellent agreement between the experimental and numerical titration curves was obtained. Such agreement becomes poorer upon the addition of surfactant; however, the main features of the PMA titration curves are preserved, which supports the role of hydrophobic interactions in PMA-surfactant association at low pH values and that of electrostatics at higher pH.

Jezik:Angleški jezik
Ključne besede:polyelectrolyte-surfactant complexes, poly(methacrylic acid), titration curves, conformational transition, charge regulation
Vrsta gradiva:Članek v reviji
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Status publikacije:Objavljeno
Različica publikacije:Objavljena publikacija
Leto izida:2024
Št. strani:10 str.
Številčenje:Vol. 413, art. 125877
PID:20.500.12556/RUL-161080-b5ee1045-b3c6-45fb-c8a0-dcb61fb82b0e Povezava se odpre v novem oknu
UDK:544.6.018.47-036.5:544.7
ISSN pri članku:0167-7322
DOI:10.1016/j.molliq.2024.125877 Povezava se odpre v novem oknu
COBISS.SI-ID:206456579 Povezava se odpre v novem oknu
Datum objave v RUL:06.09.2024
Število ogledov:185
Število prenosov:61
Metapodatki:XML DC-XML DC-RDF
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Gradivo je del revije

Naslov:Journal of molecular liquids
Skrajšan naslov:J. mol. liq.
Založnik:Elsevier
ISSN:0167-7322
COBISS.SI-ID:15382277 Povezava se odpre v novem oknu

Licence

Licenca:CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
Opis:Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:kompleksi polielektrolit-surfaktant, polimetakrilna kislina, titracijske krivulje, konformacijski prehod, regulacija naboja

Projekti

Financer:ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
Številka projekta:P1-0201
Naslov:Fizikalna kemija

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