Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Ionic strength and anion‐specificity effects on the interfacial behavior of double hydrophilic block copolymer PNIPAM‐b‐POEGA
Δημιουργός/Συγγραφέας:	Pan, Wenting Wen, Gangyao Giaouzi, Despoina [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios Chen, Hongxu
Ημερομηνία:	2024
Γλώσσα:	Αγγλικά
ISSN:	0021-8995 1097-4628
DOI:	10.1002/app.55462
Περίληψη:	In our prior paper, surface micelles with the core-shell-petal structure of the double hydrophilic block copolymer poly(N-isopropylacrylamide)-block-poly[oligo(ethylene glycol) acrylate] (PNIPAM-b-POEGA) were successfully evaluated. In this work, ionic strength (under acidic conditions) and anion-specificity effects (under neutral conditions) on the aggregation behavior of PNIPAM-b-POEGA at the air/water interface and the morphologies of its Langmuir–Blodgett (LB) films were systematically studied. Under acidic conditions, the salting-out effect prevails over the electrostatic shielding effect, and the amide group shells with a slight protonation degree are covered up by the large POEGA petals. Under neutral conditions, the stretching degrees of POEGA blocks at low/moderate salt concentrations are close. At high salt concentrations, the isotherms gradually shift to large molecular areas in the order of the NaCl, Na2SO4, NaNO3, and NaSCN cases. The hysteresis degrees of the monolayers increase with the increase of salt concentrations due to the gradually increased interfacial stretching degree and compression-induced underwater solubility of POEGA blocks. All the initial LB films of PNIPAM-b-POEGA exhibit isolated circular micelles with small cores. Upon compression, the LB films exhibit slightly large micelles because of the possible coalescence of some neighboring cores.
Τίτλος πηγής δημοσίευσης:	Journal of Applied Polymer Science
Τόμος/Κεφάλαιο:	141
Τεύχος:	23
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
Λέξεις-Κλειδιά:	copolymers hydrophilic polymers micelles monolayers and polymer brushes surfaces and interfaces
EU Grant identifier:	LH2020B014
Κάτοχος πνευματικών δικαιωμάτων:	© 2024 Wiley Periodicals LLC
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1002/app.55462
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο