DSC characterization of ion beam modifications in ion conducting PEO–salt polymers

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• 作者：Minakshi Maitra ; K.C. Verma ; Mrinal Sinha ; Rajesh Kumar ; T.R. Middya ; S. Tarafdar ; P. Sen ; S.K. Bandyopadhyay and Udayan De
• 关键词：Poly-(ethylene-oxide)– ; NH₄ClO₄ complexes ; Ion conducting polymers ; Ion beam modification ; Differential scanning calorimetry ; Impedance spectroscopy
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2006
• 出版时间：March 2006
• 年：2006
• 卷：244
• 期：1
• 页码：239-242
• 全文大小：271 K

文摘

Ion conducting polymer films have been prepared by complexing non-conducting poly-(ethylene-oxide), PEO, with x fraction of NH₄ClO₄ salt. Since its electrical conductivity showed a maximum at x somewhere between 0.18 and 0.19, such polymer films having 17 and 19 wt % salt, have been chosen and irradiated by 160 MeV Ne⁶⁺ beam. The films have been investigated by differential scanning calorimetry (DSC) and ac impedance spectroscopy before and after the irradiations. Irradiation-induced shift of an endotherm in our DSC indicates a rise in the melting temperature from 54.6 °C to 57.9 °C for the 19 % film. Cross-linking by the Ne-irradiation making the polymer structure more rigid can explain this as well as our other observation of a decrease in electrical conductivity.