Supersymmetry theory of microphase separation in homopolymer-oligomer mixtures.

The work was motivated by the interest to develop a unifying theory describing the phase behaviour of homopolymer-oligomer systems involving the interactions of different strength. A few theories, based on the simple random phase approximation method by L. Leibler, do not explain the whole picture of microphase separation in such systems. We developed a field theory of stochastic systems making use of the analogy between random copolymers and associating homopolymer-oligomer mixtures which is justified by the strong temperature dependence of monomer/oligomer complexes. Such a theory was developed on the basis of the simplest Lagrangian, whose kinetic energy contains the mass fluctuating due to the temperature sensitivity of hydrogen bonds, and potential energy describes the strength of the latter. A linear Langevin equation of motion directly leads to physically observable values -the Green function and structure factor. The approach developed yields the dependencies of the main characteristics of the microphase separated structure which are consistent with experimental data.Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi