The STUDIA UNIVERSITATIS BABE┼×-BOLYAI issue article summary

The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name.

 
       
         
    STUDIA PHYSICA - Issue no. 1 / 2004  
         
  Article:   SOME CONSIDERATIONS CONCERNING THE RELAXATION OF THE RADIATION FREE RADICALS IN POLYMERS.

Authors:  M. VELTER-STEFANESCU, O.G. DULIU, N. PREDA, I. URSU.
 
       
         
  Abstract:  Relaxation measurements performed below 77 K in X and Q bands on electrons irradiated polymers (polyethylene, polycarbonate and polymethylmethacrylate) show that the spin-lattice relaxation time of radiation free radicals varies inverse proportionally with the square of absolute temperature and free radicals concentration but does not depend on the magnetic field. All these characteristics has been explained by taking into account that below 77 K there is a considerable amount of stable radical-pairs that mediate the relaxation process of single radicals. Accordingly, within this hypothesis, an analytical equation that quantitatively describes all these particularities has been deduced.  
         
     
         
         
      Back to previous page