Abstract
The radiation indused reduction mechanism of alkyviologens in a number of polymers was studied by means of pulse and steady-state radiolysis with spectrophotometric and ESR registration of radiolysis products. It was found that the formation of reduced molecules (viologen radical-cations) occurred in reactions of bipyridinium salts with free electrons and long lived polymer radicals. The reaction time of the first process was much shorter than the electron pulse duration (2.5 μs). The mean time of the second reaction exceeded several seconds. Simultaneously with radical-cations of viologens a number of transient species, including OH-adduct (λ max=570 nm) and protonated form (λ max=595 nm), were produced during the action of electron pulse. The effective rate constant of reaction between hepthylviologen dibromide and poly(vinyl alcohol) radicals was obtained K II=(1.3±0.2)·10 2 dm 3/mol.s (E A=16.5±3.0 kcal/mol). The influence of temperature, viologen concentration, absorbed dose and polymer structure on radical-cation formation was also studied.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Radiation Applications & Instrumentation. Part C, Radiation Physics & Chemistry
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
