Gel production, oxidative degradation and dielectric properties of isotactic polypropylene irradiated under various atmospheres
АуториSuljovrujić, Edin H.
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In this work, changes in structure and physical properties of stabilized isotactic polypropylene (iPP) were created by gamma irradiation, up to a dose of 700 kGy, in different media: air, deionised distilled (DD) water and acetylene. Gel and infrared (IR) spectroscopy measurements were used to determine the changes in the degree of network formation and oxidative degradation, respectively. Sol-gel analysis was studied in detail using the Charlesby-Pinner (C-P) equation. The radiation-induced changes in the structure and evolution of oxygen-containing species were also studied through dielectric loss (tan delta) analysis in a wide temperature and/or frequency range. Evolution of low temperature dielectric relaxations with gamma irradiation was investigated. In the case of dielectric relaxation measurements, the polar groups that were introduced by irradiation in non-polar iPP were considered as tracer groups. Conclusions derived according to different methods were compared. (c) 2009 Els...evier Ltd. All rights reserved.
Кључне речи:Gamma irradiation / Polypropylene / Cross-linking / Oxidative degradation / Dielectric properties
Извор:Polymer Degradation and Stability, 2009, 94, 4, 521-526
- Ministry of Science and Technology of the Republic of Serbia