Improved thermally stable oligoetherols from 6-aminouracil, ethylene carbonate and boric acid

Abstract

Syntheses of oligoetherols with a 1,3-pyrimidine ring and boron atoms using 6-aminouracil, ethylene carbonate and boric acid has been proposed. The structure of the obtained products were determined by instrumental methods (IR, 1H-NMR and MALDI-ToF spectra). The physicochemical and thermal properties of oligoetherols were examined. The products were characterized by high thermal stability. Based on the tests performed, it was found that oligoetherols obtained from 6-aminouracil, boric acid and ethylene carbonate are suitable for the manufacturing of polyurethane foams with improved thermal stability and reduced flammability.

Glucose-Responsive Boronic Acid Hydrogel Thin Films Obtained via Initiated Chemical Vapor Deposition

“…The spectrum of the monomer includes the broad O–H stretching vibration band around 3300 cm –1 , the stretching of C–H in H–CC at 3040–3010 cm –1 , and the antisymmetric and symmetric stretching bands of sp 3 C–H at 2920 and 2860 cm –1 , respectively. Further, broad characteristic B–O–H bands caused by deformation, stretching, and bending can be found at 1730, 1450, and 1185 cm –1 , respectively. − Then, a double peak at 900 and 880 cm –1 caused by coupled B–O stretching plus O–H in-plane bending mode and a symmetric in-plane O–H bending is present. These two modes in the region of 900–1000 cm –1 are as well characteristic of boronic acid and differ from other alcohol derivates.…”

“…Since no methyl groups are present in the monomer structure, it can be assumed that their presence in the polymer chain comes from the initiator. Additionally, a band in the footprint region at 1108 cm –1 can be assigned to the C–O–C stretching vibration band, which is the interlink between the initiator and the polymer backbone . This peak should have an intensity between medium and strong according to the FTIR analysis software KnowItAll.…”

“…Further, broad characteristic B–O–H bands caused by deformation, stretching, and bending can be found at 1730, 1450, and 1185 cm –1 , respectively. 29 − 31 Then, a double peak at 900 and 880 cm –1 caused by coupled B–O stretching plus O–H in-plane bending mode and a symmetric in-plane O–H bending is present. These two modes in the region of 900–1000 cm –1 are as well characteristic of boronic acid and differ from other alcohol derivates.…”

“…Additionally, a band in the footprint region at 1108 cm –1 can be assigned to the C–O–C stretching vibration band, which is the interlink between the initiator and the polymer backbone. 29 This peak should have an intensity between medium and strong according to the FTIR analysis software KnowItAll. The peak intensity is the highest compared to all other peaks in the footprint region (the B–O–H stretching also has strong intensity).…”