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

详细信息    查看全文

• 作者：F. Fraisse ; S. Morlat-Thé ; rias ; J.-L. Gardette ; J.-M. Nedelec ; M. Baba
• 刊名：Journal of Physical Chemistry B
• 出版年：2006
• 出版时间：August 3, 2006
• 年：2006
• 卷：110
• 期：30
• 页码：14678 - 14684
• 全文大小：253K
• 年卷期：v.110,no.30(August 3, 2006)
• ISSN：1520-5207

文摘

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