Effects of polyethyleneimine-functionalized MCM-41 on flame retardancy and thermal stability of polyvinyl alcohol

Synthesis of a novel organic–inorganic hybrid flame retardant based on Ca(H2PO4)2 and hexachlorocyclotriphosphazene and its performance in polyvinyl alcohol

“…The broad peaks centered at 3400–3700 cm −1 could be assigned to the OH and NH stretching vibration, 37 manifesting that Ca(H 2 PO 4 ) 2 @HCCP/PVA membrane could emit H 2 O and NH 3 during the combustion process. The band of CH stretching vibration disappears at 2900 and 1456 cm −1 , 17 the absorption at 1620 cm −1 is corresponded to the CC stretching vibration and a new broad peak of CH and CH appears at 3000–3250 cm −1 in residue, 38 which proclaims that the PVA long chains are broken and some amorphous carbon formed in burning Ca(H 2 PO 4 ) 2 @HCCP/PVA membrane. The sharp absorption of PO stretching vibration are located at 950–1250 cm −1 and 534 cm −1 , 23,39 meaning that flame retardant Ca(H 2 PO 4 ) 2 @HCCP could decompose into phosphoric acid, metaphosphoric acid, and pyrophosphate 40 .…”

“…The band of C H stretching vibration disappears at 2900 and 1456 cm −1 , 17 the absorption at 1620 cm −1 is corresponded F I G U R E 1 0 Fourier transform infrared spectra of the 30%Ca (H 2 PO 4 ) 2 @HCCP/PVA membrane and the residue char. HCCP, hexachlorocyclotriphosphazene; PVA, polyvinyl alcohol [Color figure can be viewed at wileyonlinelibrary.com] to the C C stretching vibration and a new broad peak of C H and C H appears at 3000-3250 cm −1 in residue, 38 which proclaims that the PVA long chains are broken and some amorphous carbon formed in burning Ca(H 2 PO 4 ) 2 @HCCP/PVA membrane. The sharp absorption of P O stretching vibration are located at 950-1250 cm −1 and 534 cm −1 , 23,39 meaning that flame retardant Ca(H 2 PO 4 ) 2 @HCCP could decompose into phosphoric acid, metaphosphoric acid, and pyrophosphate.…”

Polyamide nanocomposites containing hydrazide–hydrazone group reinforced with functionalized polyethyleneimine modified Mg(OH)2 nanoparticles: Study on thermal properties, combustion resistance, and lead ion adsorption

“…The non-flammable gases, through absorbing the heat released, can be increased the flame resistance of the nanocomposite. [58] Therefore, the MCC results exhibited that MDH and FPEI had a good synergistic effect on increasing of the combustion resistance. MDH, facilitated char formation to form a protective layer in the dense phase, during the thermal degradation about 300-400 C by releasing the water molecules can positively help to the effect of PEI derivative on the diluting the gas phase.…”

Sulfonic Acid-Functionalized Fe3O4Reinforced Soluble Polyimide: Synthesis and Properties

“…Polymer magnetic nanocomposites have wide attracted in scientific and industrial applications owing to the varied remarkable properties compared to those of pure polymer [3,4] . Polymer magnetic nanocomposites play a major role in many areas of industrial, technological and biological fields such as heat transfer application, magnetic recording, magnetic data storage devices, toners and inks for catalyst/sensors, magnetite/polymer composite microbubbles, magnetic resonance imaging, waste water treatment bio separation and medicine [5][6][7][8][9][10] .…”

“…The surface of the silica shell modifies with the coupling agents such as organic and polymeric compound. The surface modification replaces the hydrophilic surface with a hydrophobic one [20][21][22] .…”