Phase and relaxation transitions in polymers with flexible and semirigid chains

The phase and relaxation transitions in polymethylpentene, copolymers of polyacryionitrile and polyoxadiazole are investigated by means of the thermal analysis procedure. Fresh relaxation transitions are found on the curves developed by thermal analysis in co-polymers of polyacryionitrile, as well as phase transitions in polymethylpentene and polyoxadiazole. Interconnection between the vitrification temperatures of these polymers and their composition, is ascertained, the procedures of polymer structure reconstruction are discussed.