The distribution of polyene segments in thermal degradation of polyvinylchloride

Минскер, К. С.; Krats, E.O.; Pakhomova, I.K.

doi:10.1016/0032-3950(70)90343-6

Cited by 9 publications

(2 citation statements)

References 10 publications

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“…In keeping with our expectations, inclusion of di(n-butyl)tin dichloride along with the tin mercaptide did improve stability significantly, and it will be noted that this beneficial effect generally increased with increasing amounts of n-Bu2SnCl2 (cf. experiments 13 and 14; also, experiments [17][18][19]. These results are, of course, consistent with the Frye-Horst theory in light of the discussion above.…”

Section: Resultssupporting

confidence: 86%

“…A reasonable structure that meets these requirements is, however, not apparent, and several other arguments can be cited against an hypothesis of this type. In the first place, the good agreement of the sulfur analyses on the products from pairs of parallel runs (experiments 11, 14, and 19) suggests that sulfur is chemically attached to these polymers, for if it were not, the analyses might have been expected to exhibit significant differences owing to a lack of experimental reproducibility in the heterogeneous extraction procedure (cf. the poor agreement of the tin analyses on these same materials).…”

Section: Resultsmentioning

confidence: 99%

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Chemical Stabilization of Poly(vinyl chloride) by Prior Reaction with Di(n-butyl)tin Bis(n-dodecyl mercaptide)

Starnes¹,

Plitz²

1976

Macromolecules

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Chemical Stabilization of Poly(vinyl chloride) by Prior Reaction with Di(n-butyl)tin Bis(n-dodecyl mercaptide)

Starnes¹,

Plitz²

1976

Macromolecules

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Thermal degradation of poly(vinyl chloride) in presence of additives, part II. Changes in absorption spectra

Varma

Sharma

1979

Angew. Makromol. Chem.

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Electronic absorption spectra of PVC degraded in ethyl benzoate at 200 "C in presence of maleic anhydride (MA), benzoquinone (BQ) and anthraquinone (AQ), were studied. The distribution of polyene sequence length was calculated. It was observed that the rate of formation of polyenes having 6 conjugated double bonds was reduced in presence of MA. In case of BQ and AQ, no such inhibiting effect was observed. However, formation of polyenes having a higher number of double bonds (i. e. n= 8) was reduced in the presence of these additives. The ageing behaviour of the degraded polymer samples was also investigated. ZUSAMMENFASSUNG:Das Absorptionsspektrum von in Athylbenzoat bei 200 "C in Anwesenheit von Maleinsaureanhydrid (MA), Benzochinon (BQ) und Anthrachinon (AQ) abgebautem PVC wurde untersucht. Die Polyensequenzlangenverteilung wurde berechnet und festgestellt, daB die Bildung von Polyenen mit 6 konjugierten Doppelbindungen durch MA, nicht hingegen durch BQ und AQ reduziert wird. BQ und AQ verringern aber die Bildung von langeren Polyenen (n= 8). Das Alterungsverhalten der abgebauten Polymerproben wird ebenfalls untersucht.

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Polyene sequence distribution in thermally degraded poly(vinyl chloride)

Abbås

Laurence

1975

J. Polym. Sci. Polym. Chem. Ed.

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A kinetic model for the formation of polyene sequences during the thermal degradation of poly(vinyl chloride) in nitrogen is proposed. The model includes a propagation step of the “zipper” type and termination by crosslinking. The initiation can occur randomly or at weak links in the polymer chain. The rate of polyene growth increased with increasing polyene sequence length and passed through a flat maximum at n = 7. The average polyene sequence length was almost constant up to about 0.5% conversion, but then slowly decreased with increasing conversion. This was the result of a larger extent of termination reactions (crosslinking) at higher conversions. At 0.2–0.5% conversion an average polyene sequence length of about 6 was observed. The degradation was carried out in nitrogen at 190°C. The experimental results were obtained from ultraviolet‐visible spectrophotometric measurements.

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The distribution of polyene segments in thermal degradation of polyvinylchloride

Cited by 9 publications

References 10 publications

Chemical Stabilization of Poly(vinyl chloride) by Prior Reaction with Di(n-butyl)tin Bis(n-dodecyl mercaptide)

Chemical Stabilization of Poly(vinyl chloride) by Prior Reaction with Di(n-butyl)tin Bis(n-dodecyl mercaptide)

Thermal degradation of poly(vinyl chloride) in presence of additives, part II. Changes in absorption spectra

Polyene sequence distribution in thermally degraded poly(vinyl chloride)

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