Activation temperature, radical-forming ability

Fig. 12. Radical-forming ability of MgO with TCNE as a function of activation temperature. [Figure according to Che et al. (/JJ).]...

A straightforward method is the sequential monomer addition, which in most cases is performed in a one-pot polymerization reaction (Figure 1(a)). Provided that termination and/or transfer reactions are negligible, the consumption of the first monomer is followed by the ability of the macromolecular active sites formed to initiate polymerization of the new incoming chemically different second monomer. This aossover reaction must proceed fast and quantitatively in order to prevent unwanted side reactions, leading to the necessity of specific order in monomer addition depending always on the chosen polymerization technique, that is, anionic or radical, and on the polymerization conditions, such as type of initiator, solvent used, reaction temperature and/or duration of the reaction, and transformation of the living ends. 

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