Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Aggregation behavior of symmetric poly(n-butyl acrylate)-block-poly(acrylic acid) on subphases of different ionic strengths
Δημιουργός/Συγγραφέας:	Yang, Shicheng Wen, Gangyao [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios You, Kun
Εκδότης:	Wiley
Ημερομηνία:	2022-05-18
Γλώσσα:	Αγγλικά
DOI:	10.1002/app.52641
Περίληψη:	Influences of subphase pH value and ionic strength (NaCl concentration) on the aggregation behavior of a symmetric diblock polyelectrolyte poly(n-butyl acrylate)-block-poly(acrylic acid) (PnBA-b-PAA) at the air/water interface and its Langmuir–Blodgett (LB) films were studied. With the increase of subphase pH value, surface pressure–molecular area isotherms of PnBA-b-PAA monolayers shift toward smaller area due to the gradually enhanced ionization and underwater solubility of hydrophilic PAA chains. All the initial LB films transferred from different subphases with/without NaCl (before monolayer compression) exhibit the densely mixed structures of worm-like aggregates and circular micelles, which indicates that the aggregate formation belongs to the spontaneous mechanism. The micelle core diameters in the LB films increase with the increase of subphase pH value, owing to the enhanced PAA chain solubility and PnBA block aggregation. Under acidic condition, micelle cores are slightly larger upon addition of NaCl due to the enhanced underwater solubility of the uncharged PAA chains triggered by their possible interaction with Cl−. Under neutral/alkaline conditions, micelle cores are also larger upon addition of NaCl, which is attributed to the electrostatic shielding effect of Na+. Upon compression, the LB films prepared under neutral/alkaline conditions exhibit the predominantly large circular micelles.
Τίτλος πηγής δημοσίευσης:	Journal of Applied Polymer Science
Τόμος/Κεφάλαιο:	139
Τεύχος:	29
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Βιοτεχνολογία[EN] Biotechnology
Λέξεις-Κλειδιά:	Copolymers Monolayers Polymer brushes Morphology Surfaces Interfaces
EU Grant identifier:	LH2020B014
Κάτοχος πνευματικών δικαιωμάτων:	2022 Wiley Periodicals LLC
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1002/app.52641
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο