Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	pH- and thermo-responsive solution behavior of amphiphilic, linear triblock terpolymers
Δημιουργός/Συγγραφέας:	Skandalis A. [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios
Εκδότης:	Elsevier Ltd
Ημερομηνία:	2018
Γλώσσα:	Αγγλικά
ISSN:	0032-3861
DOI:	10.1016/j.polymer.2018.10.023
Περίληψη:	We report on the synthesis and self-assembly in aqueous media, of novel amphiphilic double-responsive (temperature and pH) linear triblock terpolymers having the chain structure poly(n-butyl acrylate-b-N-isopropylacrylamide-b-2-(dimethylamino) ethyl acrylate) (PnBA-b-PNIPAM-PDMAEA). The terpolymers were synthesized by sequential RAFT polymerization and molecularly characterized by SEC, 1H NMR and FT-IR spectroscopy. The tertiary amine groups of the PDMAEA block were quaternized and converted to strong cationic block polyelectrolytes. Light scattering along with electron and atomic force microscopy observations, revealed that PnBA-b-PNIPAM-b-PDMAEA terpolymers form micelles with PnBA cores and mixed coronas in aqueous solutions. The micelles present strong tendency for intermicellar aggregation, probably a result of corona-corona interactions through hydrogen bonding. Increase in temperature above the LCST of PNIPAM results to further aggregation and decrease in the overall size of the polymeric aggregates, due to shrinking of the PNIPAM blocks. The quaternized terpolymers have been found to form spherical micelles with lower intermicellar aggregation phenomena.
Τίτλος πηγής δημοσίευσης:	Polymer
Τόμος/Κεφάλαιο:	157
Σελίδες:	9-18
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	pH-responsive Quaternization RAFT polymerization Self-assembly Thermo-responsive Triblock terpolymers
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2018 Elsevier Ltd
Σημειώσεις:	State Scholarships Foundation, IKY; European Social Fund, ESF Authors acknowledge financial support to this work by the Greek State Scholarships Foundation through the program “Enhancement of human scientific resources though implementation of PhD research” with resources of the European program “Development of human resources, Education and lifelong learning” , 2014–2020, co-funded by the European Social Fund and the Greek State. The help of Andreas Sergides with TEM measurements is also gratefully acknowledged.
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο