Preparation and fire behavior of rigid polyurethane foams synthesized from modified urea–melamine–formaldehyde resins

Abstract

In this study, a series of ethylene glycol modified urea–melamine–formaldehyde resins were synthesized, and then incorporated into rigid polyurethane foams as a reactive-type liquid flame retardant.

Thermal Conductivity and Mechanical Properties of Thermoplastic Polyurethane-/Silane-Modified Al2O3 Composite Fabricated via Melt Compounding

“…The tensile strength of the composite appears to be almost the same as the pure PU, although a slight increase in tensile strength is observed with increasing filler content. This is due to the advantage gained from highly stiff and high tensile strength Al 2 O 3 particles, which makes the polymer composite more resistant to low tensions, as low as 10MPa, contrary to other researchers’ works [30,31], which show a decrease in tensile strength. In summary, the addition of highly stiff alumina particles to the thermoplastic polyurethane and attachment of alumina particles affected the mechanical properties of the composite.…”

Melamine-based functionalized graphene oxide and zirconium phosphate for high performance removal of mercury and lead ions from water

“…It is clear that the XRD pattern of MT is completely different from those of melamine and KSCN which can be used as evidence for the formation of crystalline MT by the acid-catalyzed reaction between melamine and KSCN. 28,29 The FTIR spectra, displayed in Fig. 1(b), show the N-H stretching and bending vibrations of melamine in the region of 3000-3500 and 1640 cm À1 , respectively.…”

“…The peaks between 1433-1533 and 810 cm À1 are assigned to the C-N stretching and bending vibrations, respectively, and the triazine ring vibrations appear at 1021 and 578 cm À1 . 28,29 The KSCN spectrum shows the two characteristic peaks at 2046 and 1641 cm À1 due to C]S stretching and bending vibrations, respectively. 28 However, the MT spectrum shows all the peaks assigned to the C]S, N-H, C-N, and triazine vibrations in addition to two new peaks at 1173 and 655 cm À1 that can be assigned to the C-S stretching and bending vibrations, respectively.…”

Preparation and enhanced adsorption properties for CO2 and dyes of amino‐decorated hierarchical porous BCN aerogels

“…Three bands appeared at 3425, 1387, and 788 cm −1 in BN, respectively represented the O‐H stretching vibration, B‐N transverse stretching vibration and B‐N‐B bending vibration 24 . BCN precursor presents peaks at 3179, 3335, 3412, and 3490 cm −1 assigned to the amino functional groups 25 . And the peak at 3518 cm −1 can be assigned to the O‐H bond, the fingerprint region from 1650‐500 cm −1 range can be assigned to vibrations of B‐O, C‐N, C‐O, and C‐C groups 26 .…”

“…24 BCN precursor presents peaks at 3179, 3335, 3412, and 3490 cm −1 assigned to the amino functional groups. 25 And the peak at 3518 cm −1 can be assigned to the O-H bond, the fingerprint region from 1650-500 cm −1 range can be assigned to vibrations of B-O, C-N, C-O, and C-C groups. 26 In the case of BCN, the B-N stretching vibration was obviously weaker and the B-N-B bending vibration was hardly visible, which may originate from the doping of carbon weakened the vibration of B-N and introduced other miscellaneous bands.…”