Part 8: cf. 1.
On the kinetics of polymer degradation in solution, 9. Pulse radiolysis of poly(ethylene oxide)†
Article first published online: 12 MAR 2003
© 1980 Hüthig & Wepf Verlag, Basel
Die Makromolekulare Chemie
Volume 181, Issue 6, pages 1215–1226, June 1980
How to Cite
Gröllmann, U. and Schnabel, W. (1980), On the kinetics of polymer degradation in solution, 9. Pulse radiolysis of poly(ethylene oxide). Makromol. Chem., 181: 1215–1226. doi: 10.1002/macp.1980.021810606
- Issue published online: 12 MAR 2003
- Article first published online: 12 MAR 2003
- Manuscript Received: 26 JUN 1979
Poly(ethylene oxide) was irradiated with pulses of 16 MeV electrons (pulse length up to 100 ns) in aqueous and acetonitrile solutions in the absence and presence of oxygen. The change of the light scattering intensity (LSI) after the pulse was monitored. In acetonitrile solution, at a concentration of 2,3 · 10−2 base mol/1, main chain rupture occurred both in the presence and in the absence of O2. In aqueous solutions at [PEO] = 2,3 · 10−2 base mol/1 the LSI increased after the pulse in the absence of O2 (crosslinking) and decreased at [O2] = 1,4. 10−3 mol/1 (main chain scission). The rate of LSI decrease was correlated with a diffusion process in the case of O2 free acetonitrile solution and with a chemical reaction in the cases of O2 saturated aqueous and acetonitrile solutions. In the latter two cases it was found that a bimolecular reaction precedes bond scission in the main chain. It is assumed that peroxyl macroradicals (PO) react with each other forming oxyl macroradicals (PO•) which decompose relatively rapidly by main chain scission.