Effect of γ-radiation on the molecular-topological structure of polytetrafluoroethylene
Yu.A. Ol'khovInstitute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, RussiaS. R. AllayarovInstitute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, RussiaT. E. ChernyshovaInstitute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, RussiaI.M. BarkalovInstitute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, RussiaLowell D. KispertDepartment of Chemistry, University of Alabama, Tuscaloosa, Alabama, AL 35487-0336, USAJoseph S. ThrasherDepartment of Chemistry, University of Alabama, Tuscaloosa, Alabama, AL 35487-0336, USAR. E. FernandesDepartment of Chemistry, University of Alabama, Tuscaloosa, Alabama, AL 35487-0336, USAD. E. NiklesDepartment of Chemistry, University of Alabama, Tuscaloosa, Alabama, AL 35487-0336, USA
2006en
ABI
Аннотация
Four topological structures of polytetrafluoroethylene (PTFE): amorphous and three crystalline (high-melting, intermediate, and low-melting forms) blocks, were revealed by the technique of thermomechanical spectroscopy. The γ-irradiation of PTFE leaves both free volume and the molecular-mass characteristics in the pseudo-network structure of the amorphous block practically intact. In the crystalline phase, γ-irradiation decreases the molecular mass of crystallized chains of the low-temperature modification and leads to the disappearance of the intermediate and high-temperature crystalline phases as a result of their transformation into the amorphous phase.
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