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    STUDIA CHEMIA - Issue no. 3 / 2011  
         
  Article:   13C NMR STUDY OF GAMMA IRRADIATED POLYSTYRENE.

Authors:  MIHAELA POPA, TRAIAN ŞTEFAN, LIVIU DĂRĂBAN, RADU FECHETE. 		 
       
         
  Abstract:  The 13C CP/MAS NMR spectra of polystyrene were recorded for un-irradiated samples and for samples exposed to a 8989 Gy dose of gamma radiation. The most intense peaks of unirradiated sample appear at 145 and 127 ppm and are assigned to non-protonated and protonated aromatic carbons, respectively. The gamma irradiation leads to an important decay of T1p relaxation time corresponding to aromatic and methylene-methine functional groups.

Keywords: Polystyrene, 13C CP/MAS NMR, T1p 		 
         
     
         
         
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