Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Amphiphilic Polystyrene-b-poly(p-hydroxystyrene-g-ethylene oxide) Block-Graft Copolymers via a Combination of Conventional and Metal-Free Anionic Polymerization
Δημιουργός/Συγγραφέας:	Zhao, Junpeng Mountrichas, Grigoris Zhang, Guangzhao [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios
Εκδότης:	American Chemical Society
Τόπος έκδοσης:	WASHINGTON
Ημερομηνία:	2009-11-24
Γλώσσα:	Αγγλικά
ISSN:	0024-9297
DOI:	10.1021/ma9016604
Περίληψη:	This work presents the synthesis of polystyrene-block-poly(p-hydroxystyrene-graft-ethylene oxide), PS-b-(PHOS-g-PEO), amphiphilic block-graft copolymers. The backbone diblock copolymers (PS-b-PHOS) were prepared by lithium-based anionic polymerization, followed by postpolymerization acid hydrolysis of the poly(p-tert-butoxystyrene), PtBOS, precursor block. The PEO side chains were synthesized by metal-free anionic ring-opening polymerization of ethylene oxide (EO), using the phosphazene base (t-BuP)(4) and the phenolic hydroxyl groups (PhOH) in the backbones as the complex multifunctional initiating system. In all cases, starlike block-graft copolymers with high molecular weights and low polydispersities were synthesized. Well-controlled polymerization was achieved even with the molar ratio of t-BuP(4) to PhOH being equal to 0.2. Dynamic and static light scattering and fluorescence spectroscopy studies were carried out to investigate the solution behavior of the amphiphilic block-graft copolymers, including the critical micelle concentration and structural characteristics of the aggregates formed in aqueous solutions. Because of the high PEO content and the starlike macromolecular architecture, the PS-b-(PHOS-g-PEO) block-graft copolymers form highly swelled aggregates with low aggregation numbers, having nanostructures resembling hyperbranched clusters.
Τίτλος πηγής δημοσίευσης:	Macromolecules
Τόμος/Κεφάλαιο:	42
Τεύχος:	22
Σελίδες:	8661-8668
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