Browsing by Author "Loizou, Elena"
Now showing items 1-20 of 22
-
Article
Alternating amphiphilic multiblock copolymers: Controlled synthesis via RAFT polymerization and aqueous solution characterization
Hadjiantoniou, Natalie A.; Krasia‐Christoforou, Theodora; Loizou, Elena; Porcar, L.; Patrickios, Costas S. (2010)Four linear amphiphilic multiblock copolymers based on 2-(dimethylamino) ethyl methacrylate (DMAEMA, hydrophilic) and methyl methacrylate (MMA, hydrophobic), bearing from two to five blocks, were synthesized using reversible ...
-
Article
Amphiphilic Polymer Conetworks Based on End-Linked "core-First" Star Block Copolymers: Structure Formation with Long-Range Order
Kepola, Eleni J.; Loizou, Elena; Patrickios, Costas S.; Leontidis, Epameinondas; Voutouri, Chrysovalantis; Stylianopoulos, Triantafyllos; Schweins, R.; Gradzielski, M.; Krumm, C.; Tiller, J. C.; Kushnir, M.; Wesdemiotis, Chrystostomos (2015)Amphiphilic polymer conetworks are cross-linked polymers that swell both in water and in organic solvents and can phase separate on the nanoscale in the bulk or in selective solvents. To date, however, this phase separation ...
-
Article
Cationic double-hydrophilic model networks: Synthesis, characterization, modeling and protein adsorption studies
Loizou, Elena; Triftaridou, Aggeliki I.; Georgiou, Theoni K.; Vamvakaki, Maria; Patrickios, Costas S. (2003)Group transfer polymerization (GTP) was used for the preparation of eight networks based on two hydrophilic monomers, 2-(dimethylamino)ethyl methacrylate (DMAEMA) and poly(ethylene glycol) methacrylate (PEGMA). Ethylene ...
-
Article
Degradable amphiphilic end-linked conetworks with aqueous degradation rates determined by polymer topology
Rikkou-Kalourkoti, Maria D.; Loizou, Elena; Porcar, L.; Butler, P.; Patrickios, Costas S. (2009)Degradable amphiphilic conetworks, based on end-linked amphiphilic ABA triblock copolymers with a labile fragment in the middle, were synthesized by sequential group transfer polymerization (GTP) of monomers and cross-linker, ...
-
Article
Di(n-butyl) itaconate end-functionalized polymers: Synthesis by group transfer polymerization and solution characterization
Kassi, Eleni; Loizou, Elena; Porcar, L.; Patrickios, Costas S. (2011)In this study we present our efforts to homo- and co-polymerize, using group transfer polymerization (GTP), a dialkyl diester of itaconic acid, a naturally-derived unsaturated dicarboxylic acid. The monomer employed, ...
-
Article
Dynamic responses in nanocomposite hydrogels
Loizou, Elena; Butler, P.; Porcar, L.; Schmidt, G. (2006)The shear response of a series of polymer-clay gels has been investigated by means of rheology and small-angle neutron scattering (SANS). The gels have the same composition by mass but different polymer molecular weights ...
-
Conference Object
Dynamic responses in polymer-clay gels
Loizou, Elena; Porcar, L.; Butler, P.; Malwitz, M.; Schmidt, G. (2005)The shear orientation of three polymer-clay gels has been investigated by means of small angle neutron scattering (SANS). The gels have the same polymer and clay concentrations but different polymer molecular weight. The ...
-
Article
Effect of pigment dispersion on optical properties and durability of a TiO2 pigmented epoxy coating
Sung, L. -P; Gu, X.; Clerici, C.; Hu, H.; Loizou, Elena; Ho, D. L. (2009)The effect of pigment dispersion on (i) surface morphology and appearance, and (ii) the weathering durability of a TiO2 pigmented epoxy coating was investigated. The microstructure and dispersion of pigmented epoxy coatings ...
-
Article
End-linked poly[2-(dimethylamino)ethyl methacrylate]-poly(methacrylic acid) polyampholyte conetworks: Synthesis by sequential RAFT polymerization and swelling and SANS characterization
Pafiti, Kyriaki S.; Philippou, Zelina; Loizou, Elena; Porcar, L.; Patrickios, Costas S. (2011)Four well-defined end-linked triblock polyampholyte conetworks composed of positively ionizable 2-(dimethylamino)ethyl methacrylate (DMAEMA) repeating units and negatively ionizable methacrylic acid (MAA) repeating units ...
-
Article
End-linked semifluorinated amphiphilic polymer conetworks: Synthesis by sequential reversible addition - Fragmentation chain transfer polymerization and characterization
Pafiti, Kyriaki S.; Loizou, Elena; Patrickios, Costas S.; Porcar, L. (2010)One-pot, sequential reversible addition - fragmentation chain transfer (RAFT) polymerization was employed for the preparation of five end-linked semifluorinated amphiphilic polymer conetworks based on 2,2,2-trifluoroethyl ...
-
Article
End-linked, amphiphilic, degradable polymer conetworks: Synthesis by sequential atom transfer radical polymerization using a bifunctional, cleavable initiator
Rikkou-Kalourkoti, Maria D.; Loizou, Elena; Porcar, L.; Matyjaszewski, K.; Patrickios, Costas S. (2012)End-linked, degradable, amphiphilic polymer conetworks (APCNs) of various compositions and architectures were synthesized by sequential atom transfer radical terpolymerization of monomers and cross-linker using a cleavable, ...
-
Article
Heterogeneity in nanocomposite hydrogels from poly(ethylene oxide) cross-linked with silicate nanoparticles
Schexnailder, P.; Loizou, Elena; Porcar, L.; Butler, P.; Schmidt, G. (2009)We investigate the influence of ionic strength on the structural heterogeneity and viscoelastic properties of nanocomposite hydrogels. We use small-angle scattering and rheology to monitor structural changes as a function ...
-
Article
Large scale structures in nanocomposite hydrogels
Loizou, Elena; Butler, P.; Porcar, L.; Kesselman, E.; Talmon, Y.; Dundigalla, A.; Schmidt, G. (2005)The physical picture of the large scale structures in nanocomposite hydrogels and some of their unique behavior were discussed. The aqueous solutions of the synthetic hectorite type clay, Laponite RD (LRD) and poly(ethylene ...
-
Conference Object
Nanophase separated anionic amphiphilic model conetworks based on methacrylic acid
Kali, Gergely; Georgiou, Theoni K.; Iván, B.; Patrickios, Costas S.; Loizou, Elena; Thomann, Y.; Tiller, J. (2007)Two series of model amphiphilic polymer conetworks were synthesized by group transfer polymerization (GTP). The first one contained methyl methacrylate (MMA) and the second one 2-butyl-l-octyl methacrylate (BOMA) as ...
-
Article
Shear-induced nanometer and micrometer structural responses in nanocomposite hydrogels
Loizou, Elena; Porcar, L.; Schexnailder, P.; Schmidt, G.; Butler, P. (2010)The structural responses of a polymer-clay nanocomposite hydrogel to an imposed shear field are investigated from the nanometer to the micrometer length scales. The effects of polymer molecular weight and concentration of ...
-
Article
Structural characterization of amphiphilic polymer conetworks end-linked with the optimal amount of cross-linker
Rikkou-Kalourkoti, Maria D.; Loizou, Elena; Patrickios, Costas S.; Porcar, L. (2010)Amphiphilic polymer conetworks were synthesized by the end-linking of ABA triblock copolymers using optimal (minimal) amount of cross-linker in pursuit of nanoscale phase separated materials with a long-range order. ...
-
Article
Structural characterization of glassy and rubbery model anionic amphiphilic polymer conetworks
Kali, Gergely; Georgiou, Theoni K.; Ivan, B.; Patrickios, Costas S.; Loizou, Elena; Thomann, Y.; Tiller, J. C. (2008)The structure of two series of model amphiphilic polymer conetworks based on the hydrophilic anionic methacrylic acid was characterized by atomic force microscopy (AFM) and small-angle neutron scattering (SANS). In the ...
-
Article
Structural effects of crosslinking a biopolymer hydrogel derived from marine mussel adhesive protein
Loizou, Elena; Weisser, J. T.; Dundigalla, A.; Porcar, L.; Schmidt, G.; Wilker, J. J. (2006)In an effort to explore new biocompatible substrates for biomedical technologies, we present a structural study on a crosslinked gelatinous protein extracted from marine mussels. Prior studies have shown the importance of ...
-
Article
Supramolecular structures in nanocomposite multilayered films
Stefanescu, E. A.; Dundigalla, A.; Ferreiro, V.; Loizou, Elena; Porcar, L.; Negulescu, I.; Garno, J.; Schmidt, G. (2006)We investigate the multilayered structures of poly(ethylene)oxide/ montmorillonite nanocomposite films made from solution. The shear orientation of a polymer-clay network in solution combined with simultaneous solvent ...
-
Article
Synthesis and characterization of amphiphilic cationic symmetrical ABCBA pentablock terpolymer networks: Effect of hydrophobic content
Triftaridou, Aggeliki I.; Loizou, Elena; Patrickios, Costas S. (2008)Group transfer polymerization was employed for the preparation of six amphiphilic terpolymer networks comprising the hydrophilic, pH-responsive 2-(dime-thylamino)ethyl methacrylate (DMAEMA), the neutral hydrophilic methoxy ...