Polymerization of N-propargylamides with a Rh-vinyl complex: Confirmation of the presence of long-lived active species

Macromolecules

Volumn 37, Issue 11, 2004, Pages 4044-4047

  Nakazato, Atsushi ^a   Saeed, Irfan ^a   Shiotsuki, Masashi ^a   Sanda, Fumio ^a   Masuda, Toshio ^a  

^a KYOTO UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

ACETYLENE; BLOCK COPOLYMERS; CATALYSTS; CONFORMATIONS; COPOLYMERIZATION; HYDROGELS; MOLECULAR WEIGHT DISTRIBUTION; MONOMERS; POLYAMIDES; RHODIUM; SOLVENTS; SYNTHESIS (CHEMICAL); TRANSITION METALS;

INITIATION EFFICIENCY; MOLECULAR WEIGHT DISTRIBUTION (MWD); POLYDISPERSITY; PROTIC SOLVENTS;

POLYMERIZATION;

EID: 2942689989     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma035818u     Document Type: Article

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40. The sequential polymerizations of PA and 2 were also examined to prepare the corresponding block copolymers. When PA was employed as the first monomer, the GPC peak became bimodal after addition of 2 as the second monomer. The top of the lower MW peak was the same as that of the first-stage polymer. Eventually the product proved to be a mixture of poly(PA) and poly(2) and not the block copolymer. In contrast, when the first monomer was 2, the GPC of the second-stage product also showed a bimodal distribution, but neither of the peaks agreed with that of the first-stage product. From the data obtained, it is assumed that a mixture of poly(2)-bloch-poly(PA) and homopoly(PA) was formed in this order of monomer addition.