Synthesis of polyetherols from melamine and propylene carbonate. II

Kucharski, Mieczysław; Kijowska, Dorota

doi:10.1002/app.12065

Cited by 22 publications

(29 citation statements)

References 7 publications

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“…In a 100‐cm 3 ‐three‐necked round bottom flask 3 g (0.05 mol) urea (pure, POCH, Gliwice, Poland) or 4.5 g (0.025 mol) BHPU7 and the appropriate amount of PC (pure, Fluka, Switzerland), were placed to reach the molar ratio of reagents of 1 : 1–1 : 12 and 0.42–0.98 g potassium carbonate (0.84–19.56 g/mol urea or BHPU, 0.06–0.14 mol/mol urea or BHPU) or 0.38 g diazabicyclo[2.2.2]octane (DABCO) (7.6 g/mol urea, 0.06 mol/mol urea) was added. The reaction mixture was protected from moisture by tube filled with magnesium sulfate, and stirred mechanically at 140 or 160°C with monitoring of progress of reaction by determination of unreacted PC 8…”

Section: Methodsmentioning

confidence: 99%

Reaction pathway and product analysis for hydroxyalkylation of urea and N,N‐bis(2‐hydroxypropyl)urea with propylene carbonate

Zarzyka‐Niemiec¹

2008

J of Applied Polymer Sci

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The hydroxyalkylation of urea and N,N 0 -bis(2-hydroxypropyl)urea (BHPU) with propylene carbonate (PC) was studied by spectral analysis of oligomeric products using 1 H-NMR, IR and MALDI ToF methods. During the hydroxypropylation the carbonate groups in a product are partially preserved. Additionally, the hydroxypropyl groups of urea derivatives undergo partially dimerization to give carbamate groups. The obtained derivatives posses enhanced thermal stability.

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Section: Methodsmentioning

confidence: 99%

Reaction pathway and product analysis for hydroxyalkylation of urea and N,N‐bis(2‐hydroxypropyl)urea with propylene carbonate

Zarzyka‐Niemiec¹

2008

J of Applied Polymer Sci

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“…The flask was provided with a reflux condenser, mechanical stirrer and then heated to 160 and 180°C, for reaction with EC and PC, respectively, under constant mixing. The course of the reaction was followed by determining the percentage of unreacted alkylene carbonate (AC) in the reaction mixture [18]. The reaction was completed if the percentage of unreacted AC was less than 1 wt%.…”

Section: Synthesesmentioning

confidence: 99%

Polyurethane foams modified with bisoxamidoester groups

Zarzyka

Pacześniak

2015

Polym. Bull.

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In this work, the results of the research on the properties of hydroxyalkyl derivatives of bisoxamidoester have been presented. Special attention was paid for the assessment of their potential application for obtaining foamed polyurethane materials. Using these derivatives as polyol components and 4,4 0 -diphenylmethane diisocyanate, rigid foamed polyurethane materials of increased thermal stability have been obtained. The new polyurethane foams obtained using hydroxyalkyl derivatives with bisoxamidoester groups show good dimension stability and better heat-insulating and strength properties as compared to classic foams. These foams can be used as heat-insulating materials of permanent operating temperature 150°C and temporarily even approaching 200°C.

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“…It was equipped with a reflux-condenser accompanied by a drying tube and a mechanical stirrer and was heated to 180 ∘ C (Table 1) during continuous stirring. The reaction's progress was monitored by determination of unreacted PC percentage in reaction mixture [12].…”

Section: Reactions Of Bhpu Esterified By Ba With Excess Of Pcmentioning

confidence: 99%

The Modification of Polyurethane Foams Using New Boroorganic Polyols. II. Polyurethane Foams from Boron-Modified Hydroxypropyl Urea Derivatives

Zarzyka

2014

Polymer-Plastics Technology and Engineering

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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.

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Synthesis of polyetherols from melamine and propylene carbonate. II

Cited by 22 publications

References 7 publications

Reaction pathway and product analysis for hydroxyalkylation of urea and N,N‐bis(2‐hydroxypropyl)urea with propylene carbonate

Reaction pathway and product analysis for hydroxyalkylation of urea and N,N‐bis(2‐hydroxypropyl)urea with propylene carbonate

Polyurethane foams modified with bisoxamidoester groups

The Modification of Polyurethane Foams Using New Boroorganic Polyols. II. Polyurethane Foams from Boron-Modified Hydroxypropyl Urea Derivatives

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