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.

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.

Effect of the boron presence on the properties of polyurethane foams obtained with hydroxypropyl derivatives of oxamide as the polyol components

e-Polymers ◽  
2013 ◽  
Vol 13 (1) ◽  
Author(s):  
Iwona Zarzyka
Keyword(s):  
Thermal Stability ◽  
Compressive Strength ◽  
Boric Acid ◽  
Propylene Carbonate ◽  
Polyurethane Foams ◽  
Derivatives Of

Abstract The results of esterification of N,N'-bis(2-hydroxypropyl)oxamide (BHPOD) with the use of boric acid (BA) have been described. Subsequently hydroxypropyl derivatives of oxamide (OD) modified with boron as products of the reaction of BHPOD esterified boric acid with an excess of propylene carbonate (PC) have been obtained. Foamed polyurethane materials received with the use of these derivatives as polyol components and diisocyanate 4,4'-diphenylmethane exhibited higher thermal stability and compressive strength compared to the foams obtained with hydroxypropyl derivatives of OD which do not contain boron.

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 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.

scholarly journals The Modification of Polyurethane Foams Using New Boroorganic Polyols: Obtaining of Polyols with the Use of Hydroxypropyl Urea Derivatives

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Iwona Zarzyka
Keyword(s):  
Physical Properties ◽  
Boric Acid ◽  
Propylene Carbonate ◽  
Spectral Characteristics ◽  
Polyurethane Foams ◽  
Thermal Stabilities ◽  
Urea Derivatives ◽  
Methods Of Synthesis ◽  
Derivatives Of ◽  
Substituted Urea

Methods of synthesis of new prospective polyol components for obtaining of polyurethane foams of reduced combustibility using eco-friendly substrates have been presented. With this end in view, N,N′-bis(2-hydroxypropyl)urea was esterified with boric acid and next the hydrogenborate obtained was hydroxyalkylated by the excess of propylene carbonate. The influence of the way of esterification on the hydroxypropyl derivatives of borate substituted urea properties has been investigated. Esterification was run in the presence and in the absence of solvent. According to instrumental analysis, the characteristic of hydrogenborates obtained in both methods was found to be similar. The hydroxypropyl derivatives of borate substituted urea show similar spectral characteristics and thermal stabilities and differ slightly in molar masses, by-product contents, and physical properties, particularly viscosities. The properties of these derivatives were assessed paying special attention to their application as the polyol components of polyurethane foams. Hydroxypropyl urea derivatives, modified by boric acid, show changes in physical properties with temperature, similarly to typical polyols used for obtaining of polyurethane foams.

Preparation and Characterization of Novel Rigid Polyurethane Foams by Epoxidized Soybean Oil

2011 ◽  
Vol 183-185 ◽  
pp. 1581-1585 ◽  
Author(s):  
Ming He ◽  
Yi Jun Shi ◽  
Zhen Yang Luo ◽  
Xiao Li Gu
Keyword(s):  
Thermal Stability ◽  
Compressive Strength ◽  
Soybean Oil ◽  
Carbon Chain ◽  
Polyurethane Foams ◽  
Epoxidized Soybean Oil ◽  
Rigid Polyurethane Foam ◽  
Dsc Analysis ◽  
Rigid Foam

A novel rigid polyurethane foam was prepared by using epoxidized soybean oil (ESBO) instead of 50% of petrochemical polyol-835 in the B-side of foam formulation. Although there are no significant variations in density and compressive strength of ESBO-based rigid foam compared with petrochemical-based rigid foam, better thermal stability and higher melting point (of polyether section) were attained and proved by TGA, DTG and DSC analysis. Presumably, the improved characterizations could be originated from the long carbon chain of ESBO and especially the oxazolidone structure as indicated in FTIR spectrum.

Experimental Researches on Composite Bentonite-Based Briquette Binder

2012 ◽  
Vol 496 ◽  
pp. 276-280 ◽  
Author(s):  
Ming Yong Shu ◽  
Hai Ying Yin ◽  
Guang Hui Liu
Keyword(s):  
Thermal Stability ◽  
Compressive Strength ◽  
Coal Sample ◽  
Sodium Bentonite ◽  
Sample Mass ◽  
Good Thermal Stability ◽  
Humidity Resistance ◽  
Experimental Researches

Taking modified na-bentonite as matrix, PEG-20000 and NaHA are added to form composite briquette binder, while its influence on the properties of the prepared briquette is studied. The result indicates when the dosage of the composite briquette binder consisting of 0.8Kg Sodium bentonite, 0.08Kg PEG-20000 and 0.12Kg NaHA is 7% of the coal sample mass, briquette with relatively higher compressive strength, good thermal stability and desirable humidity resistance can be prepared.

scholarly journals Nitramine Derivatives of NTO - A DFT Study

2019 ◽  
pp. 45-63 ◽  
Author(s):  
Lemi Türker
Keyword(s):  
Thermal Stability ◽  
Density Functional Theory ◽  
Molecular Orbital ◽  
Density Functional ◽  
Dft Study ◽  
Chemical Sensitivity ◽  
Functional Theory ◽  
Good Thermal Stability ◽  
Derivatives Of

NTO is a nitrotriazole type explosive having good thermal stability and low chemical sensitivity. It is relatively insensitive to impact and shock. In the present study, nitramine derivatives of NTO are considered within the constraints of density functional theory at the level of B3LYP/6-31+G(d). The stabilities, some geometrical, physicochemical, and some molecular orbital characteristics etc., of the structures are considered. The calculated IR and UV-VIS spectra are presented and discussed.

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

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