Browsing by Subject "cross linking"

Article

Amphiphilic model conetworks based on cross-linked star copolymers of benzyl methacrylate and 2-(dimenthylamino)ethyl methacrylate: Synthesis, characterization, and DNA adsorption studies

Achilleos, Demetra S.; Georgiou, Theoni K.; Patrickios, Costas S. (2006)

Six amphiphilic model conetworks of a new structure, that of cross-linked "in-out" star copolymers, were synthesized by the group transfer polymerization (GTP) of the hydrophobic monomer benzyl methacrylate (BzMA) and the ...

Article

Analytical separations in open-tubular capillary electrochromatography

Kapnissi‐Christodoulou, Constantina P.; Zhu, X.; Warner, I. M. (2003)

This review represents a summary of recent progress in open-tubular capillary electro-chromatography (OT-CEC) for chiral and achiral separations. The OT-CEC approach is an alternative to packed-CEC that could eliminate the ...

Article

Cationic amphiphilic model networks based on symmetrical ABCBA pentablock terpolymers: Synthesis, characterization, and modelling

Triftaridou, Aggeliki I.; Vamvakaki, Maria; Patrickios, Costas S. (2007)

Eight isomeric networks based on equimolar terpolymers were synthesized using group transfer polymerization (GTP) and were characterized in terms of their swelling properties. Two hydrophilic monomers, the nonionic methoxy ...

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

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

Crosslink nature in Cr(III)-polyacrylamide gels

Vamvakaki, Maria; Yamasaki, E. N.; Hadjiyannakou, Stella C.; Patrickios, Costas S. (2001)

The equilibrium constants of various candidates for the crosslinking reaction between chromium(III) and partly hydrolysed polyacrylamide have been calculated. For this purpose use has been made of a) the crosslinking index ...

Article

A dimethacrylate cross-linker cleavable under thermolysis or alkaline hydrolysis conditions: Synthesis, polymerization, and degradation

Elladiou, Marios; Patrickios, Costas S. (2016)

We develop a new platform based on 2,6-pyridinediethanol diesters for introducing polymer degradability under thermolysis or alkaline hydrolysis conditions, with the latter being rare in polymers. Such labile diesters can ...

Article

Microphase separation in ABA triblock copolymer-based model conetworks in the bulk: Effect of loop formation

Karbarz, M.; Stojek, Z.; Georgiou, Theoni K.; Patrickios, Costas S. (2006)

This work estimates the free energy and domain size and predicts the phase diagram of microphase-separated model polymer conetworks, consisting of end-linked ABA triblock copolymers with cross-link points of relatively low ...

Article

Nanoscopic cationic methacrylate star homopolymers: Synthesis by group transfer polymerization, characterization and evaluation as transfection reagents

Georgiou, Theoni K.; Vamvakaki, Maria; Patrickios, Costas S.; Yamasaki, E. N.; Phylactou, Leonidas A. (2004)

Seven star polymers with degrees of polymerization (DPs) of the arms from 10 to 100 and dimensions in the nanometer range were prepared using sequential group transfer polymerization of 2-(dimethylamino)-ethyl methacrylate ...

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

The role of the cross-link His-Tyr in the functional properties of the binuclear center in cytochrome c oxidase

Pinakoulaki, Eftychia; Pfitzner, U.; Ludwig, B.; Varotsis, Constantinos (2002)

Resonance Raman and Fourier transform infrared spectroscopies have been used to study the aa3-type cytochrome c oxidase and the Y280H mutant from Paracoccus denitrificans. The stability of the binuclear center in the absence ...

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

A structural, kinetic model of soft tissue thermomechanics

Barocas, V. Η; Stylianopoulos, T.; Aksan, A. (2008)

A structure-based kinetic model was developed to predict the thermomechanical response of collagenous soft tissues. The collagen fibril was represented as an ensemble of molecular arrays with cross-links connecting the ...

Article

Synthesis and characterization of electrolytic amphiphilic model networks based on cross-linked star polymers: Effect of star architecture

Vamvakaki, Maria; Patrickios, Costas S. (2002)

Amphiphilic model networks of a new structure, that of cross-linked "in-out" star copolymers, were synthesized by a one-pot preparation using group-transfer polymerization. The networks comprised hydrophobic methyl ...

Article

Synthesis and characterization of novel networks with nano-engineered structures: Cross-linked star homopolymers

Vamvakaki, Maria; Hadjiyannakou, Stella C.; Loizidou, Efi; Patrickios, Costas S.; Armes, S. P.; Billingham, N. C. (2001)

Group transfer polymerization was used for the one-pot preparation of a network structure comprising cross-linked star homopolymers. The structure contains many dangling chains (constituting the arms of the primary stars), ...

Article

Synthesis of triazafluoranthenones via silver(I)-mediated nonoxidative and oxidative intramolecular palladium-catalyzed cyclizations

Koutentis, Panayiotis Andreas; Loizou, G.; Lo Re, D. (2011)

Silver(I) fluoride (AgF)-mediated intramolecular nonoxidative and oxidative palladium-catalyzed cyclizations of 1,3-diphenyl- and 8-iodo-1,3- diphenylbenzo[e][1,2,4]triazin-7(1H)-ones 6a (R = H) and 7a (R = I) afford a new ...

Article

Synthesis, characterization and evaluation of amphiphilic star copolymeric emulsifiers based on methoxy hexa(ethylene glycol) methacrylate and benzyl methacrylate

Hadjiyannakou, Stella C.; Triftaridou, Aggeliki I.; Patrickios, Costas S. (2005)

Amphiphilic star copolymers were synthesized by sequential monomer and cross-linker additions using group transfer polymerization (GTP). Benzyl methacrylate (BzMA) and methoxy hexa(ethylene glycol) methacrylate (HEGMA) ...

Article

Synthesis, characterization, and DNA adsorption studies of ampholytic model conetworks based on cross-linked star copolymers

Georgiou, Theoni K.; Patrickios, Costas S. (2008)

Five model conetworks based on cross-linked star ampholytic copolymers were synthesized by group transfer polymerization. The ampholytic copolymers were based on two hydrophilic monomers: the positively ionizable ...