It is found that oxygen accelerates the photodecomposition of poly(vifiyl chloride) whereas hydrogen chloride inhibits it. It is postulated that 02 quenches energy-rich polyenes and reacts in the singlet state ultimately yielding carbonyl functions which themselves absorb the radiation and speed up
The photodegradation of poly(vinyl chloride)—V The effect of wavelength of irradiation on the dehydrochlorination reaction
✍ Scribed by W.H. Gibb; J.R. MacCallum
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- English
- Weight
- 263 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0014-3057
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✦ Synopsis
For a purified sample of poly(vinyl chloride), it is found that radiation of wavelength less than 300 nm causes dehydrochlorination. It appears that polychromatic radiation yields a constant ratio of concentrations of polyenes, even from the very early stages of reaction. It is proposed that energy transfer is an important step in the photodecomposition of poly(vinyl chloride).
Previous papers in this series have dealt with various
o.e aspects of the photochemically induced decomposition of poly(vinyl chloride) [1][2][3][4]. In this paper, the effects 0.7 of varying the wavelengths of incident radiation are in-, vestigated.
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The thermal degradation of poly(viny1 chloride) (PVC) was studied by following the rates of dehydrochlorination a t temperatures between 18OOC and 280°C in pure nitrogen and air flow. Iron oxide accelerates the elimination of hydrogen chloride from PVC. The accelerating effect depends on the concent
Cast poly(vinyl chloride) films have been irradiated by ultra-violet light at various intensities and temperatures under a nitrogen atmosphere. The dehydrochlorination reaction is shown to occur in two parts. During the first hour the reaction is dependent on intensity and temperature but later it i
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