Copolymerizations
    
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         First monomer 
              Second monomer 
              r1 
              r2 
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                  D. Braun, W. Czerwinski, G. Disselhoff, F. Tudos, T. Kelen, B. Turcsanyi, Angew. Makromol. Chem., 125, 161(1984).
                 
                
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