Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Dense Monolayer Network Structures of Double Hydrophilic Hyperbranched Copolymers at the Air/Water Interface
Δημιουργός/Συγγραφέας:	Tu, Yongliang Wen, Gangyao Selianitis, Dimitrios [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios
Εκδότης:	Wiley
Ημερομηνία:	2023-11-16
Γλώσσα:	Αγγλικά
ISSN:	1022-1336 1521-3927
DOI:	10.1002/marc.202300548
Άλλο:	37972570
Περίληψη:	Influences of subphase pH and temperature on the interfacial aggregation behavior of two double hydrophilic hyperbranched copolymers of poly[oligo(ethylene glycol) methacrylate-co-(2-diisopropylamino)ethyl methacrylate] (P(OEGMA-co-DIPAEMA)) at the air/water interface are studied by the Langmuir film balance technique. Morphologies of their Langmuir-Blodgett (LB) films are characterized by atomic force microscopy (AFM). At the interface, P(OEGMA-co-DIPAEMA) copolymers tend to form a dense network structure of circular micelles composed of branching agent-connected carbon backbone cores and mixed shells of OEGMA and DIPAEMA segments (pendant groups). This network structure containing many honeycomb-like holes with diameters of 6-8 nm is identified for the first time and clearly observed in the enlarged AFM images of their LB films. Under acidic conditions, surface pressure versus molecular area isotherms of the two copolymers in the low-pressure region show larger mean molecular area than those under neutral and alkaline conditions due to the lack of impediment from DIPAEMA segments. Upon further compression, each isotherm exhibits a wide pseudo-plateau, which corresponds to OEGMA segments being pressed into the subphase. Furthermore, the isotherms under neutral and alkaline conditions exhibit the lower critical solution temperature behavior of OEGMA segments, and the critical temperature is lower when the hyperbranched copolymer contains higher OEGMA content.
Τίτλος πηγής δημοσίευσης:	Macromolecular rapid communications
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Χημεία[EN] Chemistry
Λέξεις-Κλειδιά:	Honeycomb-like structures Hyperbranched copolymers Langmuir–Blodgett films Langmuir monolayers Network structures Subphase conditions
EU Grant identifier:	LH2020B014
Κάτοχος πνευματικών δικαιωμάτων:	© 2023 Wiley-VCH GmbH
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1002/marc.202300548
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο