Wyniki wyszukiwania - BazTech

1

Polyurethane foams with pyrimidine rings

Kania E., Lubczak J.

Polish Journal of Chemical Technology

|

2014

|

Vol. 16, nr 3

1--6

EN

Oligoetherols based on pyrimidine ring were obtained upon reaction of barbituric acid with glycidol and alkylene carbonates. These oligoetherols were then used to obtain polyurethane foams in the reaction of oligoetherols with isocyanates and water. The protocol of foam synthesis was optimized by the choice of proper kind of oligoetherol and synthetic composition. The thermal resistance was studied by dynamic and static methods with concomitant monitoring of compressive strength. The polyurethane foams have similar physical properties as the classic ones except their enhanced thermal resistance. They stand long-time heating even at 200°C. Moreover thermal exposition of foams results generally in increase of their compressive strength.

2

New method of synthesis of oligoetherols with pyrimidine ring from barbituric acid and glycidol

Kania E., Lubczak J.

Polimery

|

2014

|

T. 59, nr 11-12

851--854

EN

Barbituric acid (BA) cannot be used for synthesis of oligoetherols in a straightforward reaction with ethylene oxide (EO) or propylene oxide (PO) or alkylene carbonates because it undergoes tautomeric conversion into the tri-enolic form. The latter is insoluble in oxiranes and alkylene carbonates and does not react with them further. This obstacle was eliminated by initial functionalization of BA with glycidol (GL) leading to hydroxyalkyl derivatives of BA. The hydroxyalkyl derivatives of BA dissolve easily in oxiranes or in alkylene carbonates like ethylene (EC) or propylene (PC) carbonates and react with them to give oligoetherols with enhanced thermal stability.

PL

Do syntezy oligoeteroli przeznaczonych do otrzymywania termoodpornych polimerów w reakcjach hydroksyalkilowania nadmiarem oksiranów [tlenku etylenu (EO), tlenku propylenu (PO)] lub węglanów alkilenowych nie może być stosowany kwas barbiturowy (BA), ponieważ związki alkilujące katalizują reakcje jego tautomeryzacji do formy trienolowej, która jest nierozpuszczalna we wspomnianych czynnikach hydroksyalkilujących i nie reaguje z nimi. Trudności te wyeliminowano dzięki zastosowaniu w reakcji glicydolu (GL), który umożliwia otrzymywanie hydroksyalkilowych pochodnych BA o zwiększonej funkcyjności, w porównaniu z wyjściowym kwasem. Opracowana metoda nie wymaga używania toksycznych rozpuszczalników, ponieważ otrzymane pochodne rozpuszczają się w oksiranach i węglanach alkilenowych [węglan etylenu (EC) lub węglan propylenu (PC)] oraz reagują bezpośrednio z nimi dzięki czemu otrzymuje się oligoeterole o zwiększonej termoodporności.

3

Synthesis and 1H-NMR Characterization of the Self-Assembly Based on Melamine – 5,5-Diethylbarbituric Acid

Pokrop A., Lipkowski P., Jurczak J.

Polish Journal of Chemistry

|

2007

|

Vol. 81, nr 5-6

893-901

EN

The characterization of carbonyl–metal and maleimidato–metal bonding has been performed using the topological analysis of electron distribution function estimated for molecules of ( 5-C5H5)M(CO)3( 1-N-maleimidato) (M = W, Mo) and ( 5-C5H5)Fe(CO)2( 1-N-maleimidato). The Atoms in Molecules (AIM) approach has been applied for characterization of and -components of the metal–ligand bonds. The -electron communication between trans-placed ligands is present in Wand Mo derivatives. The ellipticity parameter is suggested to be a useful and highly sensitive parameter in the analysis of the metal–ligand bonding