EFFECT OF METALLOPORPHYRINS ON THE ELIMIN ATION OF HYDROGEN-CYANIDE DURING THERMAL-OXIDATION OF POLYACRYLONITRILE

The possibility of decreasing the content of HCN (up to its complete e limination) in the volatile products of degradation formed during the thermooxidative structurization of polyacrylonitrile is demonstrated, This effect is achieved by introducing 1-6% of a metallocomplex of tet raphenylporphyrin or its structural analogs into the starting polyacry lonitrile. The reaction of metalloporphyrins with HCN formed upon the degradation of PAN was studied under the model conditions, This reacti on leads to the incorporation of -CH=N and -CH=O groups into a macrocy cle of metalloporphyrin, which can participate in intermolecular react ions to yield high-molecular-mass compounds based on metalloporphyrins . Metalloporphyrin contained in PAN as an additive is incorporated int o a heterocyclic structure upon thermal treatment. It is suggested tha t metalloporphyrins with functional groups produced by the reaction wi th HCN are involved in the process as intermediate compounds.