Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Lithium ion induced nanophase ordering and ion mobility in ionic block copolymers
Δημιουργός/Συγγραφέας:	Ioannou, Eirini F. Mountrichas, Grigoris [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios [EL] Καμίτσος, Ευστράτιος Ι.[EN] Kamitsos, Efstratios I. Floudas, George
Εκδότης:	American Chemical Society
Τόπος έκδοσης:	WASHINGTON
Ημερομηνία:	2008-08-26
Γλώσσα:	Αγγλικά
ISSN:	0024-9297
DOI:	10.1021/ma8008542
Περίληψη:	Diblock copolymers of poly(styrene-b-methacrylic acid) (PS-PMAA) of various compositions have been synthesized by anionic polymerization and were employed as templates for the development of "single-ion" polymer electrolyte systems. Lithium ions were introduced as the effective component that alters the phase state and contributes to ionic conductivity of these block polyelectrolytes. The local structure, microdomain morphology, and ion dynamics of the pure block copolymers and of the block polyelectrolytes were investigated by infrared spectroscopy, small-angle X-ray scattering, differential scanning calorimetry, and dielectric spectroscopy. Investigation of the microdomain structure revealed complexation of lithium ions with the carboxylate units of the PMAA phase in two types of coordination (chelating vs bringing) that alters the phase state of the copolymers and results in a change from the weak- to strong-segregation limit. The investigation of dynamics revealed a new dielectrically active process associated with a local relaxation of lithium ions coupled to the MAA segments via the two types of coordination. The ionic conductivity of the block polyelectrolytes was found enhanced by about 3 orders of magnitude relative to that of the parent copolymers. These results contribute to a better understanding of the changes in microdomain morphology as well as of the ion dynamics in systems resulting from the association of lithium ions with the charged PMAA block.
Τίτλος πηγής δημοσίευσης:	Macromolecules
Τόμος/Κεφάλαιο:	41
Τεύχος:	16
Σελίδες:	6183-6190
Λέξεις-Κλειδιά:	Polymer Science
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© AMER CHEMICAL SOC
Ηλεκτρονική διεύθυνση περιοδικού (link) :	http://pubs.acs.org/macromolecules
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο