Simplified B-matrix for polymers in irregular conformation

The field of conformational defects in polymers is made accessible to Lifshitz's Green-function method. By introducing local coordinate frames, a fictitious polymer chain is constructed which has the irregular conformation of the real chain but, at the same time, the phonon spectrum of the regular chain, and is described by a dynamical matrix which differs from the real one only in localized regions around the conformational defects. A general and very simple expression for the B-matrix of an isolated polymer skeleton in arbitrary irregular conformation is presented.