scholarly journals Hardly Flammable Polyurethane Foams with 1,3-Pyrimidine Ring and Boron Atoms

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1603
Author(s):  
Elżbieta Chmiel-Szukiewicz
Keyword(s):  
Thermal Stability ◽  
Water Absorption ◽  
Ethylene Carbonate ◽  
Pyrimidine Ring ◽  
Polyurethane Foams ◽  
Good Thermal Stability ◽  
Negative Effect ◽  
Instrumental Methods ◽  
Foam Production

This work presents the results of research related to the determination of application possibilities of new oligoetherols with 1,3-pyrimidine rings and boron atoms in rigid polyurethane foam production. Oligoetherols were obtained from 1,3-bis(2-hydroxyethyl)uracil, boric acid, and ethylene carbonate. Their structure was determined by instrumental methods (IR, 1H-NMR and MALDI-ToF spectra) and the physicochemical and thermal properties were examined. Obtained oligoetherols were used for synthesis of polyurethane foams. Some properties of the foams, such as apparent density, water uptake, dimensions stability, thermal stability, compression strength, thermal conductivity, oxygen index, and horizontal burning were investigated. The introduction of boron atoms into the foam structure reduced their flammability, but unfortunately it had a negative effect on the water absorption of the obtained materials—the water absorption was higher compared to the boron-free foams. The obtained foams showed good thermal stability compared to classic, rigid polyurethane foams.

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.

scholarly journals Reactions of N,N′-bis(2-hydroxyethyl)oxalamide with Ethylene Carbonate and Use of the Obtained Products as Components of Polyurethanes Foams

2010 ◽  
Vol 2010 ◽  
pp. 1-9 ◽  
Author(s):  
Iwona Zarzyka-Niemiec
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Physical Properties ◽  
Ethylene Carbonate ◽  
Polyurethane Foams ◽  
Reaction Conditions ◽  
Good Thermal Stability ◽  
Molar Excess ◽  
Instrumental Methods ◽  
Derivatives Of

-bis(2-hydroxyethyl)oxalamide (BHEOA) was subject to hydroxyalkylation with ethylene carbonate (EC). By means of instrumental methods (IR, -NMR, MALDI ToF, GC, and GC-MS), an influence of the reaction conditions on structure and compositions of the obtained products was investigated. The hydroxyalkyl and hydroxyalkoxy derivatives of oxalamide (OA) were obtained by reaction of BHEOA with 2–10-molar excess of ethylene carbonate (EC, 1,3-dioxolane-2-one). The products have a good thermal stability and possess suitable physical properties as substrates for foamed polyurethanes. The obtained products were used in manufacturing the rigid polyurethane foams which possess enhanced thermal stability and good mechanical properties.

scholarly journals The Modification of Polyurethane Foams Using New Boroorganic Polyols (II) Polyurethane Foams from Boron-Modified Hydroxypropyl Urea Derivatives

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Iwona Zarzyka
Keyword(s):  
Thermal Stability ◽  
Boric Acid ◽  
Water Absorption ◽  
Propylene Carbonate ◽  
Dimensional Stability ◽  
Polyurethane Foams ◽  
Urea Derivatives ◽  
Nitrogen Ratio ◽  
Thermal Stability Of

The work focuses on research related to determination of application possibility of new, ecofriendly boroorganic polyols in rigid polyurethane foams production. Polyols were obtained from hydroxypropyl urea derivatives esterified with boric acid and propylene carbonate. The influence of esterification type on properties of polyols and next on polyurethane foams properties was determined. Nitrogen and boron impacts on the foams’ properties were discussed, for instance, on their physical, mechanical, and electric properties. Boron presence causes improvement of dimensional stability and thermal stability of polyurethane foams. They can be applied even at temperature 150°C. Unfortunately, introducing boron in polyurethanes foams affects deterioration of their water absorption, which increases as compared to the foams that do not contain boron. However, presence of both boron and nitrogen determines the decrease of the foams combustibility. Main impact on the decrease combustibility of the obtained foams has nitrogen presence, but in case of proper boron and nitrogen ratio their synergic activity on the combustibility decrease can be easily seen.

Polyhydroxyalkylation of urea with ethylene carbonate and application of obtained products as components of polyurethane foams

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Iwona Zarzyka-Niemiec
Keyword(s):  
Thermal Stability ◽  
Compressive Strength ◽  
Ethylene Carbonate ◽  
Polyurethane Foams ◽  
Urea Derivatives ◽  
Good Thermal Stability ◽  
Low Mass ◽  
Products Of Reaction ◽  
Derivatives Of ◽  
Partial Release

AbstractThe reaction between urea and ethylene carbonate occur with partial release of CO2 and partial incorporation of carbonate groups into products. The carbonate groups were found to be attached both to nitrogen of urea and to oxyethylene chain. The most effective catalyst of the synthesis was potassium carbonate. The hydroxyethyl and hydroxyethoxy groups of urea derivatives undergo partial dimerization to form carbamate groups in the products. The products of reaction between urea and ethylene carbonate have good thermal stability, they start to decompose at 200°C. The obtained products can be used as polyol components for polyurethane foams. Polyurethane foams obtained from hydroxyethoxy derivatives of urea (EC8) are rigid products of low water uptake, good stability of dimensions, low mass loss on 30 days heating at 150°C, enhanced thermal stability and good compressive strength.

Extraction of Collagen from Catfish (Clarias gariepnus) Waste and Determination of its Physico-chemical Properties

2012 ◽  
Vol 9 (1) ◽  
pp. 29
Author(s):  
Normah Ismail ◽  
Nurul Asyiraf Abdul Jabar
Keyword(s):  
Thermal Stability ◽  
Food Industry ◽  
Chemical Properties ◽  
White Crystal ◽  
Scanning Calorimetry ◽  
Good Thermal Stability ◽  
Physico Chemical ◽  
Pale Colour ◽  
Increasing Temperature

Collagen was extracted from catfish (Clarias gariepnus) waste using 0.5M acetic acid and its subsequent precipitation in 2.6M NaCl. The resultant collagen was analysed with respect to its moisture content and physico­chemical properties including yield, pH, protein content, colour, odour and thermal stability. A yield of 16. 4% and positive collagen attributes indicate that catfish waste has potential as a collagen source. The snowy white, crystal-like and light textured collagen comprises of 5.97% protein and 0.46% moisture, and exhibits a pH of 4.75. Sensory evaluation indicates that the collagen has a slight fishy odour. Viscosity analysis indicates a steady decrease with increasing temperature over the range considered (20-50°C). The pale colour exhibited and limited odour emitted by the extracted collagen indicate that catfish waste collagen could be applied in the food industry without resulting in any undesirable food products attributes. Differential Scanning Calorimetry (DSC) analysis indicated that the collagen exhibits good thermal stability and denatures at a high temperature in a similar manner to mammalian collagen.

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.

Preparation, Thermal Stability and Electrochemical Properties of LiODFB

2012 ◽  
Vol 152-154 ◽  
pp. 1106-1111 ◽  
Author(s):  
Hong Ming Zhou ◽  
Fu Rong Liu ◽  
Jian Li
Keyword(s):  
Thermal Stability ◽  
Electrochemical Properties ◽  
Dimethyl Carbonate ◽  
Ethylene Carbonate ◽  
Specific Capacity ◽  
Decomposition Temperature ◽  
Structure Characterization ◽  
Good Thermal Stability ◽  
Ethyl Methyl ◽  
Xrd Patterns

Lithium difuoro(axalato)bonate (LiODFB) was synthesized in dimethyl carbonate solvent and purified by the method of solventing-out crystallization. The structure characterization and thermal stability of LiODFB was performed by Fourier transform infrared (FTIR) spectrometry, nuclear magnetic resonance (NMR) spectrometry and thermogravimetric analyzer (TGA). LiODFB was exposed to 50% humidity air at 25°C for different time, then dried at 80°C for 12h, and the electrochemical properties of the cells using 1 mol/L dried LiODFB in ethylene carbonate + dimethyl carbonate + ethyl(methyl)carbonate were investigated. The results show that, pure crystallization LiODFB has been obtained; it has good thermal stability with a thermal decomposition temperature of 248°C; exposed to humidity air, it is firstly converted into LiODFB•H2O; with the exposed time increasesing, more and stronger impurity peaks in the XRD patterns of LiODFB are observed, both the discharge specific capacity and the capacity retention decrease gradually

Structures and Properties of the Coating for SPEEK/WPU

2011 ◽  
Vol 117-119 ◽  
pp. 1330-1333
Author(s):  
Jian Bing Chen ◽  
Qiang Guo
Keyword(s):  
Thermal Stability ◽  
Water Absorption ◽  
Good Thermal Stability ◽  
Structures And Properties ◽  
Good Improvement

SPEEK can be dispersed in water as well as WPU, so the coating for SPEEK/WPU can be obtained in the water, and its films were investigated on the structures and properties by SEM, TGA, Shore Durometer and so forth, the results show that SPEEK as a micro-phase can disperse in WPU phase, and there is a good thermal stability when the temperature is below 290°C, and there is good improvement on the hardness of the films of coating that is about 60HA-65HA. The pH of the coating for SPEEK/WPU is about 7.0-8.0. The ratio of water absorption for films of the coating for SPEEK/WPU is about 10% and is below that of WPU, swelling of the films for solvents is also below that of WPU.

Extraction of Collagen from Catfish (Clarias gariepnus) Waste and Determination of its Physico-chemical Properties

2012 ◽  
Vol 9 (1) ◽  
pp. 29
Author(s):  
Normah Ismail ◽  
Nurul Asyiraf Abdul Jabar
Keyword(s):  
Thermal Stability ◽  
Food Industry ◽  
Chemical Properties ◽  
White Crystal ◽  
Scanning Calorimetry ◽  
Good Thermal Stability ◽  
Physico Chemical ◽  
Pale Colour ◽  
Increasing Temperature

Collagen was extractedfrom catfish (Clarias gariepnus) waste using 0.5M acetic acid and its subsequent precipitation in 2.6M NaCI. The resultant collagen was analysed with respect to its moisture content and physicochemical properties including yield, pH, protein content, colour, odour and thermal stability. A yield of 16.4% and positive collagen attributes indicate that catfish waste has potential as a collagen source. The snowy white, crystal-like and light textured collagen comprises of 5.97% protein and 0.46% moisture, and exhibits a pH of 4.75. Sensory evaluation indicates that the collagen has a slight fishy odour. Viscosity analysis indicates a steady decrease with increasing temperature over the range considered (20-50°C). The pale colour exhibited and limited odour emitted by the extracted collagen indicate that catfish waste collagen could be applied in the food industry without resulting in any undesirable food products attributes. Differential Scanning Calorimetry (DSC) analysis indicated that the collagen exhibits good thermal stability and denatures at a high temperature in a similar manner to mammalian collagen.

Obtaining of polyurethane foams with contribution of hydroxyalkylation products of oxalamide with alkylene carbonates and their properties

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Iwona Zarzyka-Niemiec
Keyword(s):  
Thermal Stability ◽  
Propylene Carbonate ◽  
Water Uptake ◽  
Ethylene Carbonate ◽  
Polyurethane Foams ◽  
Good Stability ◽  
Reaction Products ◽  
Molar Excess

AbstractReaction products of Oxalamide (OD) with a 8- and 12-molar excess of ethylene carbonate (EC) and propylene carbonate (PC), characterized by an enhanced thermal stability due to the presence of Oxalamide arrangement, were used as polyol components for obtaining foamed polyurethane plastics. As an isocyanate agent diphenylmethane-4,4’-diisocyanate was used. The obtained new foamed polyurethane plastics are characterized by a slight water uptake, good stability of dimensions and an enhanced thermal stability.

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