Über die quantenausbeute der kettenspaltung von polystyrol in lösung bei bestrahlung mit wellenlängen λ ≧ 270 nm
✍ Scribed by Wolinski, Leszek ;Witkowski, Konrad
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1985
- Weight
- 194 KB
- Volume
- 186
- Category
- Article
- ISSN
- 0025-116X
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✦ Synopsis
Abstract
Values of the mean number of chain scissions per macromolecule and the quantum efficiency of chain scission processes are presented for systems studied in our previous works, in which the photodegradation of polystyrene in solutions irradiated with mercury light (λ ≧ 270 nm) was investigated and changes of the weight‐average molecular weight M̄~w~ were considered to be a measure for chain scission. The presented values of the number of scissions were obtained as follows: the molar mass distributions were determined for the investigated polystyrene samples by dynamic (quasielastic) light scattering experiments, before and after irradiation, the number‐average molecular weight values M̄~n~ were calculated from these distributions and the mean number of scissions was obtained from the changes of the M̄~n~ values.