Nonlinear dynamics of polymer crystals

Advances in the contemporary physics have led to the discovery of new eleme ntary mechanisms that determine on the molecular level the progression of m any physical processes in crystals and other ordered molecular structures. Early theoretical investigations of nonlinear dynamics of molecular chains( 1-4)) considered one-dimensional (spatially linear) models with the sign-po sitive anharmonism, which only took into account the longitudinal displacem ents of atoms (molecules) in the chain.