Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Supramolecular Hydrogels Made of End-Functionalized Low-Molecular-Weight PEG and alpha-Cyclodextrin and Their Hybridization with SiO2 Nanoparticles through Host-Guest Interaction
Δημιουργός/Συγγραφέας:	Guo, Mingyu Jiang, Ming [EL] Πίσπας, Στέργιος[EN] Pispas, Stergios Yu, Wei Zhou, Chixing
Εκδότης:	American Chemical Society
Τόπος έκδοσης:	WASHINGTON
Ημερομηνία:	2008-12-23
Γλώσσα:	Αγγλικά
ISSN:	0024-9297
DOI:	10.1021/ma801975s
Περίληψη:	As quite generally stated in the literature, low-molecular-weight (MW) poly(ethylene glycol) (PEG) (M-n less than 2K) and alpha-cyclodextrin (alpha-CD) can lead to only crystalline precipitates (not hydrogels). However, in this study we found that: (1) adamantane monoend-functionalized low-MW PEG (Ada-PEG, M-n = 1.1 or 2K) and alpha-CD lead to hydrogels but not to crystalline precipitates and (2) beta-cyclodextrin (beta-CD) surface-functionalized silica nanoparticles (beta-CD-SiO2) can be well dispersed in low-MW Ada-PEG and alpha-CD aqueous mixtures, resulting in hybrid hydrogels. The hydrophobic aggregation of Ada-PEG in case I and the further functionalization of beta-CD-SiO2 with PEG chains due to the inclusion complexation between beta-CD and the Ada group attached to PEG in case 2 were found to play a key role as a supra-crosslink that promoted the gelation of the inclusion complexes of alpha-CD and the low-MW Ada-PEG. The resultant native and hybrid hydrogels retained the basic characteristics of the supramolecular physical hydrogels, especially the shear-thinning property. The mechanical strength and the viscosity of the hybrid hydrogel were greatly improved in comparison with those of the corresponding native hydrogels.
Τίτλος πηγής δημοσίευσης:	Macromolecules
Τόμος/Κεφάλαιο:	41
Τεύχος:	24
Σελίδες:	9744-9749
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