Electron spin resonance spectral study of PVC and XLPE insulation materials and their life time analysis

Abstract

Electron spin resonance (ESR) study is carried out to characterize thermal endurance of insulating materials used in power cable industry. The presented work provides ESR investigation and evaluation of widely used cable insulation materials, namely polyvinyl chloride (PVC) and cross-linked polyethylene (XLPE). The results confirm the fact that PVC is rapidly degrades than XLPE. The study also indicates that colorants and cable's manufacturing processes enhance the thermal resistance of the PVC. It also verifies the powerfulness and the importance of the ESR-testing of insulation materials compared to other tests assumed by International Electrotechnical Commission (IEC) Standard 216-procedure, e.g. weight loss (WL), electric strength (ES) or tensile strength (TS). The estimated thermal endurance parameters by ESR-method show that the other standard methods overestimate these parameters and produce less accurate thermal life time curves of cable insulation materials.

Electron Paramagnetic Resonance Method for the Quantitative Assay of Ketoconazole in Pharmaceutical Preparations

“…Recently, electron paramagnetic resonance spectroscopy was successfully utilized in our laboratories as an analytical tool for the investigation of the free radicals generated in different systems including fermented natural leaves, [23][24][25] degraded plastics, 26 and irradiated alanine, 27 and for the assay of chlorpromazine in drug formulations. 28 The present work is based on monitoring the radical systems formed as the result of oxidation of the KTZ with cerium(IV) in sulfuric acid media.…”

“…Recently, electron paramagnetic resonance spectroscopy was successfully utilized in our laboratories as an analytical tool for the investigation of the free radicals generated in different systems including fermented natural leaves, − degraded plastics, and irradiated alanine, and for the assay of chlorpromazine in drug formulations …”

Simple EPR/Alanine Dosimeter for Medical Application

“…Many types of binders were used to prepare these forms, e.g., paraffin, acetate polyvinyl, etc. However, the binding material may introduce a background signal or even react with the generated "stable" radicals [7][8][9][10]. These activities of the binding materials will definitely influence the EPR measurements of the irradiated alanine at different dose ranges.…”