Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Nanophase Segregation Drives Heterogeneous Dynamics in Amphiphilic PLMA‐b‐POEGMA Block‐Copolymers with Densely Grafted Architecture
Δημιουργός/Συγγραφέας:	Pipertzis, Achilleas Skandalis, Athanasios [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios Floudas, George
Ημερομηνία:	2024
Γλώσσα:	Αγγλικά
ISSN:	1022-1352 1521-3935
DOI:	10.1002/macp.202400180
Περίληψη:	The self-assembly and dynamics of amphiphilic diblock copolymerscomposed of densely grafted poly(oligo ethylene glycol methacrylate)(POEGMA) and poly(lauryl methacrylate) (PLMA) by means of calorimetry,small-angle X-ray scattering (SAXS), and dielectric spectroscopy areinvestigated. It is reported that the inherent immiscibility between the parenthomopolymers, combined with the increased molar mass, results in strongsegregation, maintained up to elevated temperatures (i.e., T = 423 K). SAXSreveals that well-separated POEGMA and PLMA domains self-assemble intospheres with bicontinuous cubic packing and in lamellar nanostructure incopolymers with respective compositions of 16 and 52 wt.% PLMA. Thisstrong segregation enables the weak crystallization/melting of the shortethylene glycol chains. Additionally, molecular dynamics are investigatedthrough isothermal dielectric and calorimetry measurements. The segmentaldynamics (i.e., Tg -related) of POEGMA and PLMA closely resemble that foundin respective homopolymers, implying heterogeneous dynamics. In the glassystate, the local motions of the POEGMA side chains predominantly governthe observed secondary processes in the copolymers. The results on theheterogeneous dynamics in the current amphiphilic diblock copolymers withthe densely grafted architecture are compared and contrasted withcopolymers having a bottle–brush architecture lacking the amphiphilic nature
Τίτλος πηγής δημοσίευσης:	Macromolecular Chemistry and Physics
Τόμος/Κεφάλαιο:	225
Τεύχος:	19
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Νανοτεχνολογία[EN] Nanotechnology
Λέξεις-Κλειδιά:	amphipilic diblock copolymers densely grafted architecture molecular dynamics nanophase separation
Κάτοχος πνευματικών δικαιωμάτων:	© 2024 The Author(s), published by Wiley-VCH GmbH
Όροι και προϋποθέσεις δικαιωμάτων:	This is an open access article under the terms of the Creative Commons Attribution-Non Commercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1002/macp.202400180
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο