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

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 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.

Density Effect on Flame Retardancy, Thermal Degradation, and Combustibility of Rigid Polyurethane Foam Modified by Expandable Graphite or Ammonium Polyphosphate

“…A large amount of work has been done to enhance the flame-retarding efficiency of halogen-free systems for RPUF from the literature [9,10], which mainly included the introduction of flame retardants containing phosphorus [11,12,13,14], nitrogen [15,16,17], silicon [18,19,20,21], and boron [22,23,24], etc. There are two major methods for enhancing the flame retardancy of a material, which are “additive-type” and “reactive-type” methods [25,26].…”

Immobilization of Streptomyces thermotolerans 11432 on polyurethane foam to improve production of Acetylisovaleryltylosin

“…Effects of different PUF cube treatments on immobilization of S. thermotolerans 11432 Various treatments have been described which can activate functional groups of PUF or change its surface roughness, both of which are conducive to the growth and immobilization of bacteria [34,37]. SEM images of the walls of PUFs exposed to various treatments are shown in Supplementary Fig.…”

Comparing the Properties of Bio-Polyols Based on White Mustard (Sinapis alba) Oil Containing Boron and Sulfur Atoms Obtained by Various Methods and Checking Their Influence on the Flammability of Rigid Polyurethane/Polyisocyanurate Foams

“…The introduction of heteroatoms to the bio-polyol molecule (such as boron) is important in reducing the flammability of polyurethane materials based on these bio-polyols. The increase in the content of such elements often results in a decrease in flammability and a decrease in the emission of toxic smoke generated during the combustion of these materials [44,45].…”