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Micellization-induced deprotonation of thermoresponsive surfactant CAE-85 — the telechelic carboxylic group derivative of Pluronic P85
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SYSNO ASEP 0365712 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Micellization-induced deprotonation of thermoresponsive surfactant CAE-85 — the telechelic carboxylic group derivative of Pluronic P85 Tvůrce(i) Šturcová, Adriana (UMCH-V) RID
Dybal, Jiří (UMCH-V) RID, ORCID
Braunová, Alena (UMCH-V) RID
Pechar, Michal (UMCH-V) RID, ORCIDZdroj.dok. Vibrational Spectroscopy. - : Elsevier - ISSN 0924-2031
Roč. 57, č. 2 (2011), s. 300-305Poč.str. 6 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova pluronic ; ATR FTIR ; deprotonation Vědní obor RIV CD - Makromolekulární chemie CEP GA203/09/1478 GA ČR - Grantová agentura ČR GA203/08/0543 GA ČR - Grantová agentura ČR CEZ AV0Z40500505 - UMCH-V (2005-2011) UT WOS 000296940700019 DOI 10.1016/j.vibspec.2011.09.001 Anotace Temperature-induced micellization of CAE-85, a carboxylic acid end-standing derivative of a copolymer Pluronic P85, was studied by attenuated total reflectance Fourier-transform infrared spectroscopy and density functional theory model calculations. In polymer micelles, carboxyl end groups dissociated in a two stage process. The first stage of deprotonation appeared with the onset of micellization – in agreement with predictions of existing models and theories for ionization processes in micellar corona. In micelles well above the critical micellization temperature, the degree of CAE-85 deprotonation increased to values significantly higher compared to unimer solution. Such deprotonation correlates well with formation of hydrogen bonded carboxyl end groups due to high density of chains in the corona of developing micelles. Thus, the proton dissociation constant, pKm, specific to the micellar form exists and is different from the proton dissociation constant of solution of unimers, pKa. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2012
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