Evolution of aromatic compounds in the thermal decomposition of vinyl polymers

Abstract

SynopsisThe thermal decomposition products that evolve from poly(viny1 chloride) (PVC), poly(viny1 bromide) (PVB), poly(viny1 alcohol) (PVA), and poly(viny1 acetate) (PVAc) were analyzed by direct pyrolysis in the ion source of a mass spectrometer (MS). Our results indicate that in both stages of the decomposition process which occurred in the four vinyl polymers investigated several aromatic hydrocarbons were produced and that the relative amounts of benzene, napthalene, and anthracene were different in the two stages. This previously unreported information determines in a single scheme the thermal behavior of the title compounds.

Boron-containing poly(vinyl alcohol) as a ceramic precursor

“…The two-step degradation observed in the TG curve of the PVA sample, has been the subject of several publications, [17,21,26] and the data is consistent with the elimination of side-groups at lower temperatures, followed by breakdown of the polymer backbone at higher temperatures. The mechanism of elimination of side-groups is based on formation of double bonds in the polymer chain [17], as schematically represented in Scheme 2.…”

Synthesis of the novel symmetric buckypaper supported ionic liquid membrane for the dehydration of ethylene glycol by pervaporation

“…Pure PVA membrane exhibited degradation at three different temperature ranges: the first degradation below 100°C involves removal of the residual moisture, the subsequent stage at a temperature between 180 and 400°C appears to involve the elimination of side groups, and the last stage at 400-600°C appears to be due to breakdown of the polymer backbone [30]. A decrease in thermal stability was observed in the blended membranes com- Sonication is widely used to exfoliate MWCNT aggregates and enhance their dispersion.…”

Slow pyrolysis of different PVC types in a bubbling fluidized bed: stabilizer effects

“…Many researchers have investigated PVC degradation [10][11][12][13][14][15][16] but the mechanisms which occur during degradation are not yet fully understood. Generally, PVC degradation during pyrolysis, below 400 • C, follows two steps.…”