Entity

Time filter

Source Type


Sava I.,Petru Poni Institute of Macromolecular Chemistry | Kopnick T.,Institute of Thin Film and Microsensoric Technology
Revue Roumaine de Chimie | Year: 2014

New aromatic diamines containing two side substituted azobenzene groups have been obtained by chemical modification of 2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane with different p-bromoalkyloxy-p'-methyl-azobenzene compounds in the presence of K2CO3/KI. The bromoalkyloxy-methylazobenzenes have been prepared by the reaction of p-hydroxy-p'-methylazobenzene with different dibromoalkanes. All intermediates and the prepared diamines have been characterized by melting points, infrared spectroscopy and proton nuclear magnetic resonance. The new diamines can be used further as monomers for production of new polyimides or copolyimides for high performance applications. Source


Constantin C.-P.,Petru Poni Institute of Macromolecular Chemistry | Damaceanu M.-D.,Petru Poni Institute of Macromolecular Chemistry | Bruma M.,Petru Poni Institute of Macromolecular Chemistry | Kopnick T.,Institute of Thin Film and Microsensoric Technology
Journal of Polymer Research | Year: 2014

This study is concerned with the synthesis and properties of new soluble quinoxaline-containing copoly(naphthylimide-amide)s having different flexible units such as ether, hexafluoroisopropylidene or diphenylsilane, in which the six-membered imide cycle is directly connected to the amide unit through a N-N bond. The polymers were successfully synthesized through the Yamazaki-Higashi polycondensation reaction of a mixture 1:1 of naphthalene-N,N'-bis(imido-amine) and 4,4-{1,4-phenylene-bis[(3-phenyl-2,7-quinoxalinediyl)oxy]}dianiline or 4,4-{oxy-bis[4,1-phenylene(3-phenyl-2,7-quinoxalinediyl)oxy]}dianiline with 4,4-hexafluoroisopropylidene-bis(benzoic) acid, 4,4-diphenylsilane-bis(benzoic) acid or with 4,4-oxy-bis(benzoic) acid. These poly(imide-amide)s exhibited good solubility in common aprotic solvents, and the resulting polymer solutions were processed into amorphous thin films with homogeneous and neat surfaces. Their thermal characterization indicated a moderate to high thermal stability and no glass transition. The photoluminescence study of polymers both in solution and film state showed their ability for blue light color emission. The HOMO and LUMO energy levels were calculated by using cyclic voltammetry and UV-vis spectroscopy data, showing good electron injection and transport characteristics. © 2014 Springer Science+Business Media Dordrecht. Source


Damaceanu M.-D.,Petru Poni Institute of Macromolecular Chemistry | Gilsing H.-D.,Institute of Thin Film and Microsensoric Technology | Schulz B.,Institute of Thin Film and Microsensoric Technology | Arvinte A.,Petru Poni Institute of Macromolecular Chemistry | Bruma M.,Petru Poni Institute of Macromolecular Chemistry
RSC Advances | Year: 2014

A new poly(3,4-propylenedioxythiophene) (PProDOT) derivative combining ion complexing oligoether units and a reactive ester group in the side chain obtained by oxidative chemical and electrochemical polymerization of the corresponding ProDOT monomer is described. The P(ProDOT-EO-ester) chemically synthesized after dedoping reveals a strong UV blue shift in THF in the presence of Na+ and K+, respectively, indicating conformational disordering and a substantially decreased conjugation of the polymer chain induced by ion complexation. Post-polymerization functionalization can be achieved by treatment with hydrazine hydrate leading to partial hydrazinolysis of the ester group. The electrogrowth process of the polymer on ITO is carried out using Bu4NClO4 or LiClO4 as supporting electrolyte, resulting in the formation of conductive thin films. Cyclic voltammetry reveals a slight shift of the redox peaks to lower potentials in the presence of Li+. This journal is © the Partner Organisations 2014. Source

Discover hidden collaborations