Xanthate-Mediated Controlled Radical Polymerization of N-Vinylcarbazole

✍ Scribed by Hideharu Mori; Hiroshi Ookuma; Shuji Nakano; Takeshi Endo

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 209 KB
• Volume: 207
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200600070

✦ Synopsis

Abstract

Summary: Well‐defined poly(N‐vinylcarbazole) [poly(NVC)] was synthesized by macromolecular design via interchange of the xanthates (MADIX)/reversible addition‐fragmentation chain transfer (RAFT) polymerization. The homopolymers with controlled molecular weights ($\overline M _{\rm n}$ = 3 000–48 000) and low polydispersities indices ($\overline M _{\rm w} /\overline M _{\rm n}$ = 1.15–1.20) were obtained by the polymerization of NVC with AIBN in the presence of O‐ethyl‐S‐(1‐phenylethyl) dithiocarbonate as a xanthate‐type chain transfer agent (CTA). Good control of the polymerization was confirmed by the linear first‐order kinetic plot, the molecular weight controlled by the monomer/CTA molar ratio, linear increase in the molecular weight with the conversion, and the ability to extend the chains by the second addition of the monomer.

Radical polymerization of NVC in the presence of CTA and plot of number‐average molecular weight (circles) and polydispersity (squares) as a function of conversion.

magnified imageRadical polymerization of NVC in the presence of CTA and plot of number‐average molecular weight (circles) and polydispersity (squares) as a function of conversion.