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Topological solitons in crystals formed by aliphatic molecules with dimeric rings

Abstract The paper discusses mechanisms of molecular motion in lamellar chain molecular crystals of the stearic acid. Thermal calorimetry, dielectric and IR-spectroscopy methods indicate a phase transition from the orthorhombic crystal phase into the orthorhombic rotator phase in the vicinity of Тrot = 50 °С. This rotator phase allows for the excitation of the topological solitons, which reorient the aliphatic chain by 180° and translate it by one link. These topological solitons form at the terminal methyl groups and, upon propagating along the chain, are reflected from the dimeric ring until their energy is high enough to reorient the dimer. Dissociation of the dimeric rings of the stearic acid takes place later in the melt.