Study of the thermal degradation of poly(N‐vinyl‐2‐pyrrolidone) by thermogravimetry–FTIR

Abstract

SYNOPSISThe thermal degradation of poly (N-vinyl-2-pyrrolidone) (PVP) was studied by dynamic thermogravimetric analysis (TGA) in the range 200-600°C under nitrogen and oxygen atmospheres a t various heating rates. The apparent activation energy of the degradative process was determined by the application of kinetic treatments, giving an average value of 242 kj/mol in Nz, whereas in the presence of oxygen, two trends may be considered At relatively low temperatures (200-400°C) and degrees of conversion, a, lower than 0.5, we obtained an average value of 199 kjlmol, whereas in the temperature interval 400-600°C with degrees of conversion higher than 0.5, the value of E, was 306 kjlmol. Isothermal experiments carried out in N2 in the interval 350-400°C gave an average value of E. = 231 kj/mol, in good agreement with that obtained from dynamic treatments. The FTIR spectra of the volatile compounds evolved in degradation experiments carried out in Nz as well as in the presence of oxygen suggest that PVP is thermally degraded, predominantly, by the release of the pyrrolidone side group and the subsequent decomposition of polyenic sequences. 0 1993 John Wiley & Sons, Inc.

Quantitative determination of poly(vinylpyrrolidone) by continuous-flow off-line pyrolysis-GC/MS

“…To our knowledge, only two papers have dealt with the analysis of the possible degradation products [18,19]. These studies revealed the formation of pyrrolidone [18] or a mixture of pyrrolidone and N-vinylpyrrolidone [19] as the main pyrolytic products of pure PVP and, therefore, support our observations.…”

“…To our knowledge, only two papers have dealt with the analysis of the possible degradation products [18,19]. These studies revealed the formation of pyrrolidone [18] or a mixture of pyrrolidone and N-vinylpyrrolidone [19] as the main pyrolytic products of pure PVP and, therefore, support our observations. Noteworthy, thermal degradation of PVP adsorbed on the surface of pyrogenic silica showed a pronounced dependence between the amount of the adsorbed polymer and the relative distribution of both degradation products, 2-Py and NVP [19].…”

“…3 has been proposed [18,19]. The breakdown of side chains is accompanied by degradation of PVP main chains, as well.…”

Shedding light on precursor and thermal treatment effects on the nanostructure of electrospun TiO2 fibers

“…Indeed, PVP is thermally degraded, predominantly, by the release of the pyrrolidone side group and the subsequent decomposition of polyenic sequences [27]. In inert atmosphere those polyenic sequences, undergoing to condensation reaction, may lead to the formation of a certain amount of carbonaceous residue.…”

One-step synthesis of poly(lactic-co-glycolic acid)-g-poly-1-vinylpyrrolidin-2-one copolymers

“…All thermograms showed two distinct zones, ascribed to the degradation of the PLGA and PVP portions, with a decomposition temperatures at 5% weight loss of 308 8C and 387 8C, respectively, in line with the values normally reported for the virgin polymers. 32,33 Passing from PLGA-g-PVP 10:1 to PLGA-g-PVP 10:2 and PLGA-g-PVP 10:3 the thermograms showed the expected increase of the PVP-related portions. The TGA estimates of the wt% PVP, namely 5.0, 13.2, and 21.9 were fairly consistent with the IR assessments.…”