Polyetherols obtained from 6‐aminouracil and oxiranes

Chmiel-Szukiewicz, Elżbieta

doi:10.1002/app.25100

Cited by 8 publications

(24 citation statements)

References 6 publications

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“…The thermal stability of the polyetherols obtained from 6-AU and EC was comparable to the thermal stability of those obtained from 6-AU and EO. 15 Ethylene glycol and polyglycols, included in the products, did not reduce their thermal stability. Initial tests of the foaming of the obtained products showed that these polyetherols could be used as components of polyurethane foams of improved thermal stability.…”

Section: Resultsmentioning

confidence: 93%

Polyetherols obtained from 6‐aminouracil and ethylene carbonate

Chmiel-Szukiewicz

2007

J of Applied Polymer Sci

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The reactions of 6-aminouracil with ethylene carbonate were investigated. Potassium carbonate or 1,4-diazabicyclo[2.2.2]octane was used as a catalyst. An excess of ethylene carbonate was applied in the syntheses. In this way, polyetherols with 1,3-pyrimidine rings in their structure were prepared. The structure of the products was analyzed with infrared, proton nuclear magnetic resonance, and matrix-assisted laser desorption/ionization time-of-flight techniques. Some physical properties and the thermal stability of the prepared polyetherols were investigated.

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Section: Resultsmentioning

confidence: 93%

Polyetherols obtained from 6‐aminouracil and ethylene carbonate

Chmiel-Szukiewicz

2007

J of Applied Polymer Sci

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“…These processes can provide the kinetic models mimicking initial steps of the synthesis of polyetherols from oxiranes and azacyclic substrates containing few imide groups, for example isocyanuric acid [29], barbituric acid [30] or 6-amino-uracyl [31]. These azacyclic substrates are sparingly soluble in organic solvents and therefore their reactivities cannot be studied in this class of solvents.…”

Section: Introductionmentioning

confidence: 99%

Hydroxyalkylation of Cyclic Imides with Oxiranes Part I. Kinetics of Reaction in Presence of Triethylamine as Catalyst

Lubczak¹

2012

OJPC

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Literature describes kinetics of reactions of alcohols, phenols, carboxylic acids, amines and amides with oxiranes such as ethylene oxide and propylene oxide. However, there is no information regarding kinetic of reaction of imides with oxiranes. In this article the kinetics of the reaction of cyclic monoimides: succinimide, phtalimide, and glutarimide, with ethylene and propylene oxides in presence of triethylamine in aprotic solvent was studied. The rate laws for those processes were established based upon on dilatometric measurements. I was said that cyclic monoimides react with oxiranes in presence of triethylamine to give N-(2-hydroxyalkyl)imides as major product. This product react further with oxiranes in consecutive reaction. The kinetics of the reaction of cyclic mono-imides with oxiranes obey the following rate law: V = k 1/2 . Based upon kinetic data the following orders of reactivity of imides and oxiranes were obtained: phtalimide ≥ succinimide > glutarimide and ethylene oxide > propylene oxide. The solvent (DMF, DMSO and dioxane) effect was also studied. From temperature dependences the thermodynamic parameters: activation energy, enthalpy and entropy from linear Eyring plots were obtained.

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“…The TG-curve show that 5% mass loss at temperature 150 ºC, and 50% mass loss at 270 ºC occur. Thermal stability of this polyetherol is similar to thermal stability of product obtained from 6-AU and oxiranes [4] and alkylene carbonates [5,6].…”

Section: Resultsmentioning

confidence: 72%

“…These polyetherols can be obtained in reactions of 6-aminouracil (6-AU) with excess of oxiranes (I) [4] or alkylene carbonates (II) [5,6]. where: R = -H, -CH 3 , 3,0 ≤ x + y + z ≤ 10,4.…”

Section: Introductionmentioning

confidence: 99%

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

Chmiel-Szukiewicz

2011

E-Polymers

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New 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, 1 H-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.

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Polyetherols obtained from 6‐aminouracil and oxiranes

Cited by 8 publications

References 6 publications

Polyetherols obtained from 6‐aminouracil and ethylene carbonate

Polyetherols obtained from 6‐aminouracil and ethylene carbonate

Hydroxyalkylation of Cyclic Imides with Oxiranes Part I. Kinetics of Reaction in Presence of Triethylamine as Catalyst

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

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