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Micellization-induced deprotonation of thermoresponsive surfactant CAE-85 — the telechelic carboxylic group derivative of Pluronic P85

SYSNO ASEP	0365712
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Micellization-induced deprotonation of thermoresponsive surfactant CAE-85 — the telechelic carboxylic group derivative of Pluronic P85
Author(s)	Šturcová, Adriana (UMCH-V)_RID Dybal, Jiří (UMCH-V)_{RID, ORCID} Braunová, Alena (UMCH-V)_RID Pechar, Michal (UMCH-V)_{RID, ORCID}
Source Title	Vibrational Spectroscopy. - : Elsevier - ISSN 0924-2031 Roč. 57, č. 2 (2011), s. 300-305
Number of pages	6 s.
Language	eng - English
Country	NL - Netherlands
Keywords	pluronic ; ATR FTIR ; deprotonation
Subject RIV	CD - Macromolecular Chemistry
R&D Projects	GA203/09/1478 GA ČR - Czech Science Foundation (CSF)
	GA203/08/0543 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z40500505 - UMCH-V (2005-2011)
UT WOS	000296940700019
DOI	10.1016/j.vibspec.2011.09.001
Annotation	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.
Workplace	Institute of Macromolecular Chemistry
Contact	Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358
Year of Publishing	2012

Number of the records: 1