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Abstract
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 impact on the foams’ properties was 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 a temperature of 150°C. Unfortunately, introducing boron in polyurethanes foams affects deterioration of their water absorption, which increases as compared to the foams 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.
Notes
x – oxypropylene unit.
*in case of syntheses 1-6 EBU was used directly.
TX% - temperature, in which x% weight loss occurs.
*4,4′-diphenylomethane diisocyanate
**triethylamine; Creaming time: time from start of stirring to start of growth; Expanding time: time from start of growth to obtaining final dimensions; Drying time: time from the end of foam growth to lack of adhesion of powder materials.
Tx%: temperature in which x% weight loss takes place.
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