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Effect of temperature on self-assembly of amphiphilic block-gradient copolymers of styrene and acrylic acid
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SYSNO ASEP 0442233 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název Effect of temperature on self-assembly of amphiphilic block-gradient copolymers of styrene and acrylic acid Tvůrce(i) Borisova, O. V. (FR)
Billon, L. (FR)
Černochová, Zulfiya (UMCH-V) RID, ORCID
Lapp, A. (FR)
Štěpánek, Petr (UMCH-V) RID, ORCID
Borisov, O. V. (FR)Zdroj.dok. Macromolecular Symposia, 348 (1). - Weinheim : WILEY-VCH Verlag GmbH, 2015 - ISSN 1022-1360 Rozsah stran s. 25-32 Poč.str. 8 s. Forma vydání Tištěná - P Akce International Symposium "Molecular Order and Mobility in Polymer Systems" /8./ Datum konání 02.06.2014-06.06.2014 Místo konání St. Petersburg Země RU - Rusko Typ akce WRD Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova gradient copolymers ; self-assembly ; small angle neutron scattering Vědní obor RIV CC - Organická chemie CEP LH14292 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000349819900004 EID SCOPUS 84925349833 DOI 10.1002/masy.201400174 Anotace The effect of temperature on self-assembly of a novel type of amphiphilic ionic copolymers comprising a hydrophilic poly(acrylic acid) PAA block and an amphiphilic poly(acrylic acid)-grad-poly(styrene) PAA-grad-PS copolymer block has been studied by Small Angle Neutron and Dynamic Light Scattering (SANS, DLS). The polymers have been synthesized using direct Nitroxide-Mediated Polymerization (NMP) as described elsewhere and proved to be capable of formation of the equilibrium (dynamic) micelles responsive to variations in pH and ionic strength of the solution. We have demonstrated that an increase in temperature from 20 to 80 °C has almost no influence if the assembly occurs at pH similar to 6 in a wide range of salt concentration. Under these conditions stable micelle aggregates are formed. At pH similar to 6.9 virtually no aggregation occurs at any temperature in salt-free solution, whereas at 1 M salt concentration we observed an appearance of the correlation peak in the scattering curves and an increase in hydrodynamic radius in dilute solutions evidencing self-association of polymer chains. The magnitude of the correlation peak increases upon an increase in temperature. This behaviour may be attributed to the combined effect of temperature on the ionization constant and on the strength of hydrophobic interactions. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2016
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