Reversible chain transfer catalyzed polymerization

Reversible Chain Transfer Catalyzed Polymerization (RTCP) with Alcohol Catalysts... 

Alcohols (phenols, a vinyl alcohol, and an iodide derivative) worked as efficient catalysts for reversible chain transfer catalyzed polymerization (RTCP). Low-polydispersity (MJMn 1.2-1.3) polystyrenes and poly(methyl methaciylate)s with predicted molecular weights were obtained with a fairly high conversion. Attractive features of the alcohol catalysts include their high reactivity (a small amount being required), low or no toxicity, and low cost (cheapness). 

Goto, A., Tsujii, Y, and Fukuda, T. 2008. Reversible chain transfer catalyzed polymerization (RTCP) A new class of living radical polymerization. 2s1M L... 

RTCP Reversible chain transfer catalyzed polymerization... 

RTCP involves a reversible chain transfer (RT) process with a catalyst (Scheme 4a) that improves the dispersity control, as well as the mentioned small contribution of DT (Scheme Id). The catalyst can be, e.g., Af-iodosuccinimide (NIS) (Scheme 4a) [31], and works as a deactivator. Polymer (which is originally supplied by the conventional radical initiator) reacts with NIS to produce N-succinimide radical (NS ). NS works as an activator of Polymer-I to generate Polymer and NIS again. This cycle allows for frequent reversible activation of Polymer-I. This process is a reversible chain transfer of NIS that catalytically activates Polymer-I. Therefore, the polymerization was termed reversible chain transfer catalyzed polymerization (RTCP). Regarding the components used, RTCP is similar to initiators for continuous activator regeneration (ICAR)-ATRP [65]. Both systems use a monomer, a dormant species (alkyl iodide or alkyl bromide), a conventional radical initiator, and a deactivator [NIS or copper (II)] to regenerate a highly reactive activator [NS or copper (I)]. 

The other CRDRP techniques are atom-transfer radical polymerization (ATRP), reversible-chain-transfer catalyzed polymerization (RTCP) and... 

ATRP), and reversible chain transfer catalyzed polymerizations " and (iii) degenerative transfer-based polymerization (with reversible addition-fragmentation chain transfer (RAFT) polymerization being the most successful technique but also including iodine-mediated polymerizations and polymerizations in the presence of tellurium or antimony compounds ). Most of these techniques are covered in detail in other chapters of this book. 

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