
%0 Journal Article
%A Pyun, Jeffrey 
%A Rees, Ian 
%A Fréchet, Jean M. J. 
%A Hawker, Craig J. 
%T Evaluating the Effect of Termination by Chain&#8211;Chain Coupling in Living Free-Radical Polymerizations
%J Australian Journal of Chemistry
%D 2003/07/18
%V 56
%N 8
%P 775-782
%K 
%R https://doi.org/10.1071/CH03041
%U https://www.publish.csiro.au/paper/CH03041 
%X A novel approach based on the reaction of multifunctional star polymers with chromophore-labelled linear polymers is presented for evaluating the extent of termination by chain&#8211;chain coupling during living free-radical polymerizations. A mixed initiating system consisting of an unlabelled, multifunctional initiator and an excess of a monofunctional alkoxyamine initiator containing a chromophore, such as pyrene, is used to initiate the living polymerization of vinyl monomers leading to a mixture of star and linear polymers. The occurrence of chain&#8211;chain coupling is readily identified and quantified by isolating the star polymer that is obtained and elucidating the level of incorporation of pyrene units by UV/vis spectroscopy. This allows the level of chain&#8211;chain coupling to be determined since the inclusion of pyrene into the star structure is a direct result of termination by radical coupling. 
