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    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.  
         
     
         
         
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