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The phase behavior of gamma and laser irradiated polytetrafluorine |
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| Authors: | S. R. Allayarov Yu. A. Olkhov V. G. Nikolskii P. N. Grakovich D. A. Dixon |
| Affiliation: | 1. Institute of Problems of Chemical Physics of the Russian Academy of Sciences, Chernogolovka, Russia 2. Institute of Chemical Physics of the Russian Academy of Sciences, Moscow, Russia 3. Institute of Mechanics of Metal-Polymer Systems of National Academy of Sciences of Belarus, Minsk, Belarus 4. Department of Chemistry, the University of Alabama, Tuscaloosa, USA |
| Abstract: | By using thermomechanical spectroscopy, an amorphous and three crystalline (high melting, intermediate, and low melting forms) blocks of the topological structures of polytetrafluoroetylene (PTFE) were characterized and their behavior under γ-radiation up to 2420 kGy was explored. The influence of γ-radiation on the powder and sheet of PTFE is essentially the same leading to formation of amorphous character. The glass transition and melting point temperatures of PTFE continuously decreased with increasing dose of irradiation. On exposure to continuous CO2 laser radiation, PTFE degrades at a high rate and its clusters have a fibrous form. Initial γ-irradiation of PTFE enhances the laser ablation process. |
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