Studies on the thermal degradation of phosphorus containing polymers: 7. Thermal degradation of phosphorylated poly(vinyl alcohol)

Flame‐retardant and physical properties of poly(vinyl alcohol) chemically modified by diethyl chlorophosphate

“…The characteristic absorption peaks at 1154 cm −1 are attributed to PO stretching. Moreover, the new band at 744 cm −1 related to the appearance of cis CC group 29. Compared with Figure 6(a,b), the intensities of peaks at 2920 cm −1 , 2851 cm −1 assigned to vibration of CH 3 and CH 2  obviously decrease.…”

The Surface Structure and Thermal Properties of Novel Polymer Composite Films Based on Partially Phosphorylated Poly(vinyl alcohol) with Aluminum Phosphate

“…Variations in the P=O peak at 1329–1331 cm −1 for Samples F0–F2 are due to hydrogen bonding and the P=O peak disappears completely for Samples F3–F5. The C–OH peak disappears, whereas the C–O peak appears [ 7 , 8 , 30 ] upon the addition of PA. The disappearance of the C–OH peak is attributed to the chemical modifications of PVA by PA.…”

“…The second stage of degradation occurs between 190 and 460°C due to the spontaneous degradation of PPVA and breakup of PVA backbones [ 35 ]. The decomposition of PVA begins at 460–700°C while the residue oxidation occurs between 700 and 950°C [ 8 ]. Char formation occurs during the final stage of degradation and the unoxidized residue remains at temperatures above 950°C [ 8 ].…”

“…Furthermore, there is physical rubbery after esterification [ 2 ]. The phosphorylation of PVA with phosphoric acid (PA) in producing partially phosphorylated poly(vinyl alcohol) (PPVA) has attracted considerable interest in the applications such as fire-retardant materials [ 3 – 8 ], electrolyte [ 2 , 9 – 12 ], membranes [ 13 – 15 ], metal chelating [ 16 – 18 ], paper making [ 19 ], sensors [ 20 – 23 ], synthetic bones/teeth [ 17 , 24 ], and nanoparticle/nanocomposite [ 25 – 28 ].…”

Enhanced conductivity and electrochemical properties for class of hybrid systems via sol–gel techniques

“…The spectral changes were therefore, clear evidence that there occurred a reaction between the -OH group of the PVA and the Si-O-Si network. The broad absorption peak at around 3000-3400 cm À1 in the hybrid membranes indicates that there were a In the IR spectrum of the hybrid membrane, the broad band around 1080 cm À1 (characteristic of Si-O-Si asymmetric stretching) [28,29], indicates that the silica phase was successfully achieved by the hydrolysis and condensation reaction. The increase in wt.% of PVA in the composite membranes led to an increased intensity of the peaks at about 942, 1511, 2935 and 3002 cm À1 .…”