Reactions of Vinyl Polymers Containing Nitrile Groups with Dicyanodiamide.

The reaction between dicyanodiamide and a cyano compound to form 2-substituted-4, 6-diamino-s-triazine has been applied to a vinyl polymer containing nitrilegroups. When polyacrylonitrile (PAN) was used as a starting polymer, naphthylidenetyperings were formed in addition, to fhe expected triazine structure as a result of the competitive reaction Thus, it was possible to introduce triazine rings up to only13.3 mol % despite the presence of a large number of cyano groups.Essentially no triazine ring was formed when an acrylonitrile-styrene copolymer containing less than 20 mol % acrylonitrile was treated with dicyanodiamide. Thecontent of the intraduced turiazine ring was in creased as the acrylonitrile content was raised. Thus, approximately 30 mol % triazine rings were introduced to the polymer when the nitrile content was 77.6 mol %. Some consideration on theseresults were given.