Show simple item record

dc.contributor.authorPopescu, M. -Ten
dc.contributor.authorTsitsilianis, C.en
dc.contributor.authorPapadakis, Christine M.en
dc.contributor.authorAdelsberger, J.en
dc.contributor.authorBalog, Sándoren
dc.contributor.authorBusch, P.en
dc.contributor.authorHadjiantoniou, Natalie A.en
dc.contributor.authorPatrickios, Costas S.en
dc.creatorPopescu, M. -Ten
dc.creatorTsitsilianis, C.en
dc.creatorPapadakis, Christine M.en
dc.creatorAdelsberger, J.en
dc.creatorBalog, Sándoren
dc.creatorBusch, P.en
dc.creatorHadjiantoniou, Natalie A.en
dc.creatorPatrickios, Costas S.en
dc.date.accessioned2019-11-21T06:22:28Z
dc.date.available2019-11-21T06:22:28Z
dc.date.issued2012
dc.identifier.urihttp://gnosis.library.ucy.ac.cy/handle/7/56055
dc.description.abstractAn amphiphilic cationic polyelectrolyte based on poly[2-(dimethylamino) ethyl methacrylate] (polyDMA) and poly(n-butyl methacrylate) (polyBuMA) with a BuMA-DMA-BuMA-DMA-BuMA-DMA-BuMA heptablock copolymer architecture was studied in aqueous media. This copolymer was found to form a physical hydrogel via the intermolecular hydrophobic association (physical cross-linking) of the BuMA blocks. The rheological properties of the heptablock hydrogels were investigated as a function of copolymer concentration, and pH. The results showed a peculiar pH-dependence of the rheological properties, remarkably different from those observed with associative telechelic polyelectrolytes. Aqueous solutions of this copolymer were free-flowing sols at low pH (below 2) and high pH (above 8), whereas they turned into gels at intermediate pH values. The rheological properties studied as a function of pH showed two additional stiff-soft-stiff gel transitions at pH 4.5 and 6.5. Small-angle neutron scattering revealed the formation of a 3D transient network of bridged flower-like micelles whose structural characteristics, i.e., micellar radius, hard-sphere radius and hard-sphere volume fraction, were smoothly evolving with the pD. © 2012 American Chemical Society.en
dc.sourceMacromoleculesen
dc.source.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84860157388&doi=10.1021%2fma300222d&partnerID=40&md5=ee54d6843732239d7d34a50a14a97d74
dc.subjectNeutron scatteringen
dc.subject2-(dimethylamino)ethyl methacrylateen
dc.subjectCopolymersen
dc.subjectAqueous mediaen
dc.subjectPoly(n-butyl methacrylate) (Pn-BMA)en
dc.subjectStructural characteristicsen
dc.subjectRheologyen
dc.subjectRheological propertyen
dc.subjectPolymer blendsen
dc.subjectSmall-angle neutron scatteringen
dc.subjectSpheresen
dc.subjectHydrogelsen
dc.subjectStimuli-responsiveen
dc.subjectFlower-likeen
dc.subjectPolyelectrolytesen
dc.subjectSolsen
dc.subjectCopolymer concentrationen
dc.subjectpH valueen
dc.subjectAmphiphilic polyelectrolytesen
dc.subjectAmphiphilic cationic polyelectrolytesen
dc.subjectFree flowingen
dc.subjectGel transitionsen
dc.subjectHard-sphereen
dc.subjectHeptablock copolymersen
dc.subjectHigh pHen
dc.subjectIntermolecular hydrophobic associationen
dc.subjectPH responseen
dc.subjectpH-dependenceen
dc.subjectTelechelicsen
dc.subjectTransient networken
dc.titleStimuli-Responsive amphiphilic polyelectrolyte heptablock copolymer physical hydrogels: An unusual ph-responseen
dc.typeinfo:eu-repo/semantics/article
dc.identifier.doi10.1021/ma300222d
dc.description.volume45
dc.description.issue8
dc.description.startingpage3523
dc.description.endingpage3530
dc.author.faculty002 Σχολή Θετικών και Εφαρμοσμένων Επιστημών / Faculty of Pure and Applied Sciences
dc.author.departmentΤμήμα Χημείας / Department of Chemistry
dc.type.uhtypeArticleen
dc.description.notes<p>Cited By :16</p>en
dc.source.abbreviationMacromoleculesen
dc.contributor.orcidPatrickios, Costas S. [0000-0001-8855-0370]
dc.gnosis.orcid0000-0001-8855-0370


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record