Morphological, acoustical, and physical properties of free-rising polyurethane foams depending on the flow directions

Thermally resistant polyurethane foams containing 1,3,5-triazine ring were modified with additive flame retardants. It has been found that addition of melamine, melamine polyphosphate, or isocyanurate at the foaming step resulted in reduction of foam flammability. The physical properties of flame-retardant modified foams were compared with those of non-modified foams. The obtained modified foams showed oxygen index 22.2–24.2 and were highly thermally resistant even at long lasting 200℃ temperature exposure.

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Polyurethane Foams with Pyrimidine Rings

Polish Journal of Chemical Technology ◽

10.2478/pjct-2014-0041 ◽

2014 ◽

Vol 16 (3) ◽

pp. 1-6 ◽

Cited By ~ 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.

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

International Journal of Polymer Science ◽

10.1155/2014/250782 ◽

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.

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