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Browsing by Subject "Hydrogels"

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    • Article  

      Cationic amphiphilic model networks: Synthesis by group transfer polymerization and characterization of the degree of swelling 

      Simmons, M. R.; Yamasaki, E. N.; Patrickios, Costas S. (2000)
      Group transfer polymerization (GTP) was applied to prepare model networks based on 2-(dimethylamino)ethyl methacrylate (DMAEMA) and methyl methacrylate (MMA). The flexibility of GTP allowed the synthesis of three isomeric ...

    • Article  

      Cationic homopolymer model networks and star polymers: Synthesis by group transfer polymerization and characterization of the aqueous degree of swelling 

      Simmons, M. R.; Yamasaki, E. N.; Patrickios, Costas S. (2000)
      A series of hydrophilic model networks based on homopolymers of a weak base were prepared using group transfer polymerization (GTP) and characterized in terms of their aqueous degree of swelling as a function of pH. This ...

    • Article  

      Covalent amphiphilic polymer networks 

      Patrickios, Costas S.; Georgiou, Theoni K. (2003)
      The recent literature on chemically cross-linked amphiphilic polymer networks is reviewed. The main subjects covered are network synthesis, characterization, modeling and applications. Special mention is made to more modern ...

    • Article  

      Double-networks based on pH-responsive, amphiphilic "core-first" star first polymer conetworks prepared by sequential RAFT polymerization 

      Kitiri, E. N.; Patrickios, C. S.; Voutouri, C.; Stylianopoulos, T.; Hoffmann, I.; Schweins, R.; Gradzielski, M. (2017)
      This manuscript presents the preparation and study of a new double-network hydrogel system, comprising an amphiphilic, pH-responsive first polymer conetwork synthesized via reversible addition-fragmentation chain transfer ...

    • Article  

      Double-networks based on pH-responsive, amphiphilic "core-first" star first polymer conetworks prepared by sequential RAFT polymerization 

      Kitiri, E. N.; Patrickios, Costas S.; Voutouri, Chrysovalantis; Stylianopoulos, Triantafyllos; Hoffmann, I.; Schweins, R.; Gradzielski, M. (2017)
      This manuscript presents the preparation and study of a new double-network hydrogel system, comprising an amphiphilic, pH-responsive first polymer conetwork synthesized via reversible addition-fragmentation chain transfer ...

    • 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 ...

    • Article  

      Fabrication and characterization of superparamagnetic and thermoresponsive hydrogels based on oleic-acid-coated Fe3O4 nanoparticles, hexa(ethylene glycol) methyl ether methacrylate and 2-(acetoacetoxy)ethyl methacrylate 

      Papaphilippou, P.; Pourgouris, A.; Marinica, O.; Taculescu, A.; Athanasopoulos, G. I.; Vekas, L.; Krasia-Christoforou, T. (2011)
      Stimuli-responsive hydrogel nanocomposites comprised of swollen polymer networks, in which magnetic nanoparticles are embedded, are a relatively new class of "smart" soft materials presenting a significant impact on various ...

    • 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  

      "Inverse polyampholyte" hydrogels from double-cationic hydrogels: Synthesis by RAFT polymerization and characterization 

      Pafiti, Kyriaki S.; Elladiou, Marios; Patrickios, Costas S. (2014)
      We present two novel, homologous, pyridine-based monomers, 2-(pyridin-2-yl)ethyl methacrylate (PyEMA) and (pyridin-2-yl)methyl methacrylate (PyMMA), which, despite their structural similarity, the former can be readily ...

    • 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 ...

    • Article  

      Polyelectrolytic amphiphilic model networks in water: A molecular thermodynamic theory for their microphase separation 

      Vamvakaki, Maria; Patrickios, Costas S. (2002)
      The aqueous aggregation behavior of networks comprising hydrophilic ionic blocks and hydrophobic nonionic blocks was studied by formulating a molecular thermodynamic theory, which considers the Gibbs free energies of the ...

    • Article  

      Randomly cross-linked homopolymer networks: Synthesis by group transfer polymerization in solution and characterization of the aqueous degree of swelling 

      Hadjiyannakou, Stella C.; Yamasaki, E. N.; Patrickios, Costas S. (2001)
      Randomly cross-linked homopolymer networks of 2-(dimethylamino)ethyl methacrylate (DMAEMA) of various average degrees of polymerization (DPs) between cross-links were synthesized by group transfer polymerization (GTP) in ...

    • Article  

      Regular and inverse polyampholyte hydrogels: A detailed comparison 

      Constantinou, Anna P.; Elladiou, Marios; Patrickios, Costas S. (2016)
      Two series of polyampholyte (PA) hydrogels were prepared via reversible addition-fragmentation chain transfer polymerization, followed by removal of the protecting group of the acidic monomer repeating units (methacrylic ...

    • Article  

      Reversible hydrogels from amphiphilic polyelectrolyte model multiblock copolymers: The importance of macromolecular topology 

      Popescu, M. -T; Athanasoulias, I.; Tsitsilianis, C.; Hadjiantoniou, Natalie A.; Patrickios, Costas S. (2010)
      The association ability of model amphiphilic polyelectrolytes with multi-block architecture, i.e. ABA, BABAB, ABABABA and BABABABAB (A hydrophobic, B polyelectrolyte block) was studied in aqueous media. The gelation ...

    • 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  

      Stimuli-Responsive amphiphilic polyelectrolyte heptablock copolymer physical hydrogels: An unusual ph-response 

      Popescu, M. -T; Tsitsilianis, C.; Papadakis, Christine M.; Adelsberger, J.; Balog, Sándor; Busch, P.; Hadjiantoniou, Natalie A.; Patrickios, Costas S. (2012)
      An 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 ...

    • 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  

      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 ...

    • Article  

      Synthesis and characterization of three-component polyelectrolytic amphiphilic model networks 

      Hadjiantoniou, Natalie A.; Triftaridou, Aggeliki I.; Georgiou, Theoni K.; Patrickios, Costas S. (2005)
      Two hydrophilic monomers, 2-(dimethylamino)ethyl methacrylate (DMAEMA, ionizable) and methoxy hexa(ethylene glycol) methacrylate (HEGMA, non-ionic), and one Hydrophobic monomer, n-butyl methacrylate (BuMA) were copolymerized ...

    • Article  

      Synthesis, characterization, and modeling of cationic amphiphilic model hydrogels: Effects of polymer composition and architecture 

      Triftaridou, Aggeliki I.; Hadjiyannakou, Stella C.; Vamvakaki, Maria; Patrickios, Costas S. (2002)
      Group transfer polymerization (GTP) was used for the preparation of eight amphiphilic networks based on 2-(dimethylamino)ethyl methacrylate (DMAEMA) and methyl methacrylate (MMA). Seven of the networks had linear segments ...

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