[en] Neutrons are one of the products of the interaction of cosmic rays with materials. When reduced to very low energies, neutrons have large probabilities for interaction with matter. These particles can be absorbed with a high probability by boron-10, a stable isotope of boron. In this study, boron powder was added to two radiation resistant polymeric materials: a polysulfone, and a polyetherimide. Films of both materials with up to 20% by mass of boron were made. Infrared spectra taken before and after irradiation with 100 keV electrons showed that the modified materials behave the same as the pure polymers when irradiated. Tests in a small neutron source showed that the boron-loaded films were effective in absorbing low-energy neutrons