In Situ Kinetics Study of the Accelerated Aging of Poly(ethylene oxide) Using PhotoDSC

Frédéric Fraisse (1) , Sandrine Morlat-Therias (1) , Jean-Luc Gardette (1) , Jean-Marie Nedelec (2) , Mohamed Baba (1)

1 PMM - Photochimie moléculaire et macromoléculaire
2 LMI - Laboratoire des Matériaux Inorganiques

PhotoDSC has been applied to follow the global kinetics of chain scissions resulting from the UV light irradiation or from the thermal degradation of a high molecular weight PEO (4 106 gâmol-1). Infrared spectroscopy, XRD measurements and rheology experiments were performed to evidence the occurrence of chain scissions. Melting energy was used as a tool to quantify the extent of the degradation. It was found that the chain scissions reaction follows a first-order kinetic law for both photo and thermal degradation. The activation energies were found identical in both cases (41 kJ mol-1), whereas the degradation rate was higher in the case of UV irradiation than in the case of thermoageing.

Domaines: Matériaux; Polymères

Frédéric Fraisse, Sandrine Morlat-Therias, Jean-Luc Gardette, Jean-Marie Nedelec, Mohamed Baba. In Situ Kinetics Study of the Accelerated Aging of Poly(ethylene oxide) Using PhotoDSC. Journal of Physical Chemistry B, 2006, 110 (30), pp.14678-14684. ⟨10.1021/jp061669g⟩. ⟨hal-00154707⟩