Premium
Block Copolymer Synthesis of N ‐Vinylcarbazole and Cyclohexene Oxide by Radical/Cation Transformation Polymerization
Author(s) -
Kamachi Mikiharu,
Guo HaiQing,
Kajiwara Atsushi
Publication year - 2002
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20020401)203:7<991::aid-macp991>3.0.co;2-c
Subject(s) - polymerization , chemistry , copolymer , polymer chemistry , cyclohexene oxide , electron acceptor , radical polymerization , polymer , photochemistry , organic chemistry
The polymerization of N ‐vinylcarbazole (VCZ) was performed by electron‐acceptors whose reduction potentials were different. The polymer of VCZ was obtained in higher yield when initiated by a more reductive electron acceptor. These polymerizations were inhibited in the presence of cyclic ethers such as cyclohexene oxide (CHO) and trioxane. Cyclic ethers did not influence the radical polymerization of VCZ with 2,2′‐azoisobutyronitrile (AIBN). The polymerization of VCZ with AIBN was promoted in the presence of electron‐acceptors. In particular, the promotion of polymerization was remarkable in the case of Ph 2 I + PF 6 – , which is most likely to accept an electron. These phenomena show that the propagating radical of VCZ is transformed into corresponding cation by electron transfer reaction to an acceptor in the process of radical polymerization. On the basis of data on the polymerizability of VCZ and CHO, a block copolymer formation of VCZ and CHO was expected by the polymerization of VCZ and CHO with AIBN in the presence of Ph 2 I + PF 6 – by one step method without the preparation of telechelic polymer. The block copolymer formation was confirmed by extraction separation, 1 H NMR, thin layer chromatography, and turbidimetric titration.