ON THE POSSIBLE MECHANISM OF PHASE-TRANSITIONS IN MESOMORPHIC HIGH-MOLECULAR COMPOUNDS

The conception of the multistage character of melting of high-molecular compounds is proposed. Examples illustrating this assumption are presented for various types of polymer systems of organic and organoelement nature with and without mesogenic groups in the wide range of variation of macromolecules flexibility from typically rigid to traditionally flexible polymers. The possible mechanisms of phase transformations in the temperature range are discussed for the most interesting case - for flexible polymers without mesogenic groups, but being capable to form thermotropic mesophases.