Two-dimensional neutron scattering study of the bulk microstructure of polytetrafluoroethylene under uniaxial stress

摘要

The effect of a uniaxial stress on the microstructural organization of the phase IV of the bulk polytetrafluoroethylene is examined. Due to the absence of hydrogen, this semicrystalline polymer is particularly adapted to neutron scattering. The experiment was performed using a pioneering two-dimensional neutron detector Barotron, illustrating this tool benefit in this research field. It will be shown that a high degree of alignment of the crystallites is obtained from lowest elongation rates. The two-dimensional analysis distinguished the structural contributions, affected or not by the mechanical deformation, and identified the amorphous from the crystalline components of the polymer.