Living polymers by the use of trithiocarbonates as reversible addition-fragmentation chain transfer (RAFT) agents: ABA triblock copolymers by radical polymerization in two steps

Macromolecules

Volumn 33, Issue 2, 2000, Pages 243-245

  Mayadunne, Roshan T A ^a   Rizzardo, Ezio ^a   Chiefari, John ^a   Krstina, Julia ^a   Moad, Graeme ^a   Postma, Almar ^a   Thang, San H ^a  

^a CSIRO   (Australia)

Author keywords

[No Author keywords available]

Indexed keywords

ADDITION REACTIONS; AGENTS; CARBONATES; DISSOCIATION; FREE RADICAL POLYMERIZATION; MOLECULAR WEIGHT; POLYMETHYL METHACRYLATES; POLYSTYRENES; REACTION KINETICS; SULFUR COMPOUNDS;

HOMOPOLYMERS; LIVING POLYMERS; POLYDISPERSITY; REVERSIBLE ADDITION-FRAGMENTATION CHAIN TRANSFER (RAFT) AGENTS; TERITHIOCARBONATES;

BLOCK COPOLYMERS;

EID: 0033892289     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma991451a     Document Type: Article

References (19)

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3. 2CN are examples of very poor and very good homolytic leaving groups, respectively.
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13. 8 The advantage of trithiocarbonates is that they are more readily available.
14. For leading references on the reactions of dithio compounds, see: Kato, S.; Ishida, M. Sulfur Rep. 1988, 8, 155. Mayer, R.; Scheithauer, S. In Houben-Weyl Methods of Organic Chemistry; Beuchel, K. H., Falbe, J., Hagemann, H., Hanack, M., Eds.; Thieme: Stuttgart, Germany, 1985; Vol. E, p 891.
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19. As described in our previous publications, the amount of impurity polymer (homo- and diblock impurity) produced is dependent on the number of initiator-derived chains and not the amount of initiator used in the experiment. In ascertaining the amount of initiator derived chains, based on the rate of decomposition of the initiator, allowance must also be made for the efficiency of the initiator. Thus, in summary: [initiator-derived chains] = [initiator decomposed] × [initiator efficiency] × 2 = [diblock impurity] + [homopolymer impurity].