5. Conclusion

Neutron scattering is an essential technique for studying polymer conformation, thanks to isotope substitution as a labeling method. We should mention the use of this method for dynamic studies of polymers by inelastic neutron scattering [1] and for studies of planar interfaces by the fast-developing technique of specular neutron reflection [18] . These techniques are still little used compared with small-angle neutron scattering.