Synthesis of polyetherols with 1,3-pyrimidine ring using 6-aminouracil, ethylene carbonate and propylene oxide

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Elżbieta Chmiel-Szukiewicz
Keyword(s):  
Thermal Stability ◽  
Thermal Resistance ◽  
Physical Properties ◽  
1H Nmr ◽  
Propylene Oxide ◽  
Compression Strength ◽  
Ethylene Carbonate ◽  
Pyrimidine Ring ◽  
Linear Dimensions ◽  
Thermal Stability Of

AbstractNew method of synthesis of polyetherols with 1,3-pyrimidine ring by reactions of 6-aminouracil with ethylene carbonate and propylene oxide was described. The structure of products was analyzed using the IR, 1H-NMR and MALDI-TOF spectroscopies. Some physical properties and thermal stability of polyetherols were investigated. Initial tests on the foaming of polyurethanes obtained from the polyetherols were performed. Some properties of the foams such as apparent density, absorption of water, linear dimensions stability, thermal resistance and compression strength were investigated. Obtained foams show an improved thermal stability.

scholarly journals Multifunctional oligoetherols and polyurethane foams with carbazole ring

2016 ◽  
Vol 18 (1) ◽  
pp. 120-126 ◽  
Author(s):  
Renata Lubczak
Keyword(s):  
Thermal Analysis ◽  
Thermal Resistance ◽  
Physical Properties ◽  
Mass Loss ◽  
Propylene Oxide ◽  
Compression Strength ◽  
Room Temperature ◽  
Polyurethane Foams ◽  
H Nmr ◽  
High Thermal Resistance

Abstract A new method of preparation of multifunctional oligoetherols containing carbazole ring is presented. The oligoetherols were obtained in the reaction of 9-(2,3-epoxypropyl)carbazole with sorbitol and oxiranes like ethylene and propylene oxide. The structure of obtained oligoetherols was determined by IR, H-NMR and MALDI-ToF spectroscopies. Physical properties of the products render them good candidates for preparing polyurethane foams. The foams were obtained and their properties were examined. It has been found that the foams are rigid at room temperature and their apparent density was 50–70 kg/m3. The water uptake was low, maximum to 6.5 mass%. Obtained foams have high thermal resistance. Dynamic thermal analysis of these foams showed that 5% mass loss was initiated at 250–300°C, while temperature of 50% mass loss was 370–404°C. Concomitantly the increase of compression strength was observed.

scholarly journals Extraordinary thermal behavior of graphene oxide in air for electrode applications

2021 ◽  
Author(s):  
Joong Tark Han ◽  
Joon Young Cho ◽  
Jeong Hoon Kim
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Physical Properties ◽  
Thermal Behavior ◽  
Stability Of Solution ◽  
Exfoliated Graphene ◽  
Potential Applications ◽  
Thermal Stability Of

The thermal stability of solution-exfoliated graphene oxide (GO) in air is one of the most important physical properties influencing its potential applications. To date, majority of the GO prepared by...

scholarly journals Improved thermally stable oligoetherols from 6-aminouracil, ethylene carbonate and boric acid

2019 ◽  
Vol 17 (1) ◽  
pp. 1080-1086
Author(s):  
Elżbieta Chmiel-Szukiewicz
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Boric Acid ◽  
Ethylene Carbonate ◽  
Pyrimidine Ring ◽  
Polyurethane Foams ◽  
High Thermal Stability ◽  
H Nmr ◽  
Maldi Tof ◽  
Instrumental Methods

AbstractSyntheses of oligoetherols with a 1,3-pyrimidine ring and boron atoms using 6-aminouracil, ethylene carbonate and boric acid has been proposed. The structure of the obtained products were determined by instrumental methods (IR, 1H-NMR and MALDI-ToF spectra). The physicochemical and thermal properties of oligoetherols were examined. The products were characterized by high thermal stability. Based on the tests performed, it was found that oligoetherols obtained from 6-aminouracil, boric acid and ethylene carbonate are suitable for the manufacturing of polyurethane foams with improved thermal stability and reduced flammability.

Study on the Thermal Stability of Selected Ionic Liquids

2015 ◽  
Vol 220-221 ◽  
pp. 218-223
Author(s):  
Tomasz Jan Kaldonski ◽  
Stanislaw Cudzilo
Keyword(s):  
Higher Education ◽  
Thermal Stability ◽  
Ionic Liquids ◽  
High Temperature ◽  
Thermal Resistance ◽  
Chemical Structure ◽  
Research Project ◽  
High Thermal Resistance ◽  
Thermal Stability Of

Some results of tests of the thermal stability (and volatility) of selected ionic liquids pondered as lubricating substances in comparison with typical lubricating, mineral and synthetic oils, are presented in the article. The research was carried out within the framework of PBR/15–249/2007/WAT–OR00002904 Research Project Financed by the Ministry of Science and Higher Education, during 2007–2011 [1]. The obtained results confirmed high thermal resistance of ionic liquids. It makes it possible to use the liquids as high temperature lubricating substances. At the same time, it has been stated that the thermal resistance of ionic liquids depends on the composition and chemical structure of anion and cation.

scholarly journals Polyurethane Foams with Pyrimidine Rings

2014 ◽  
Vol 16 (3) ◽  
pp. 1-6 ◽  
Author(s):  
Ewelina Kania ◽  
Jacek Lubczak
Keyword(s):  
Compressive Strength ◽  
Thermal Resistance ◽  
Physical Properties ◽  
Barbituric Acid ◽  
Pyrimidine Ring ◽  
Polyurethane Foams ◽  
Long Time

AbstractOligoetherols 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.

scholarly journals Study by 23Na-NMR, 1H-NMR, and Ultraviolet Spectroscopy of the Thermal Stability of an 11-Basepair Oligonucleotide

2000 ◽  
Vol 78 (2) ◽  
pp. 1059-1069 ◽  
Author(s):  
Perrine Cahen ◽  
Michel Luhmer ◽  
Catherine Fontaine ◽  
Claude Morat ◽  
Jacques Reisse ◽  
...  
Keyword(s):  
Thermal Stability ◽  
1H Nmr ◽  
Ultraviolet Spectroscopy ◽  
Thermal Stability Of ◽  
23Na Nmr
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