Investigation of the macromolecular stable free nitroxide radical—II: Polystyrene with tert.-butyl nitroxide groups at the meta-position
✍ Scribed by M. Azori; F. Tüdős
- Book ID
- 103074122
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 259 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0014-3057
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✦ Synopsis
AlmtnLct--Polystyrene containing t-butyl nitroxide groups at the recta-position was prepared from styrene-(m-bromostyrene) copolymer. The structure of the radical was identified by ESR measurements. Polymerization of styrene initiated by AIBN at 50 ° has been studied dialatometrically in the presence of the polymeric radical; a strong inhibiting effect was observed. A linear relationship was found between the concentration of the polymeric inhibitor and the length of the inhibition period. Radical contents of the samples were determined by ascorbic acid titration. The concentration of the reactive groups (I0-s-10-" mol-equiv/g) was identical with radical concentration determined by kinetic measurements.