Studies of chlorinated polyisobutenes—II. Isothermal degradation
✍ Scribed by R. McGuchan; I.C. McNeill
- Publisher
- Elsevier Science
- Year
- 1967
- Tongue
- English
- Weight
- 550 KB
- Volume
- 3
- Category
- Article
- ISSN
- 0014-3057
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✦ Synopsis
Ai~a-act--A detailed study has been made of the degradation behaviour of four chlorinated polyisobutene samples, containing from 0.5 to 2-0 atoms of chlorine per monomer unit. The chlorine was labelled with 36C1 and the evolution of volatiles was followed radiochemically. The chlorinated polymers are much less stable than the parent polyisobutene; degradation was studied in the temperature range 190-240 ° . At these temperatures, it was found that even after prolonged degradation only about half of the available chlorine was released as volatile products. The main product of degradation was found to be hydrogen chloride.
📜 SIMILAR VOLUMES
Studies have been made of the gaseous and liquid products and the involatile residue from the degradation of polychloroprene. Programmed heating was used; below 400 ° in addition to hydrogen chloride, small amounts of ethylene and a trace of chloroprene were detected in the volatile products. Above
Polyisobutene (PIB) dissolved in saturated hydrocarbons was degraded by irradiation with 2 ,us impulses of 15 MeV electrons. The time dependence of the change of light-scattering intensity (LSI) (due to the decrease of molecular weight) was measured. The half life r I,\_,(LS) of the decrease of LSI