RTCP reversible chain transfer

RTCP 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... 

Scheme 4 (a) Reversible chain transfer for RTCP and (b) reversible complexation for RCMP... 

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... 

Goto et al. [279] developed a process that they describe as reversible living chain transfer radical polymerization [278], where they us Ge, Sn, P, and N compounds iodides in the iodide mediated polymerizations." In this process, a compound such as GeLt is a chain transferring agent and the polymer-iodide is catalytically activated via a RFT process. They proposed that the new reversible activation process be referred to as RTCP [279]. The process can be illustrated by them as follows [279] ... 

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