The detection of carbazole units and poly N-vinyl carbazole in copolymers derived from N-vinyl carbazole

✍ Scribed by A. Ledwith; A.M. North; K.E. Whitelock

• Publisher: Elsevier Science
• Year: 1968
• Tongue: English
• Weight: 264 KB
• Volume: 4
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(68)90014-1

✦ Synopsis

Abstraet--Carbazole units in copolymers can be cross-linked by reaction with a Lewis acid catalyst in methylene chloride. The reaction initially causes gel formation, followed by the development (with BF3. Et20) of a characteristic blue colour. The blue product has been shown to be a cationic dye of the diaryl-methyl type, derived from the dye base, bis-(9-alkyl-3-carbazolyl)-methane.

Acrylic or vinyl ester homopolyrners are unaffected by this reaction, and can be extracted from the gel; N-vinyl carbazole homopolymer noticeably accelerates the gel forming reaction by cross-linking with copolymers.

A series of free radical copolymerizations of N-vinyl carbazole with methyl acrylate, methyl methacrylate, acrylonitrile and vinyl acetate were conducted in solution at 30 °, and the products subjected to tkis reaction. In no case was any homopolymer formed.