Diffusion of lithium, sodium and potassium chlorides from aqueous solu
tions into polypropylene (PP) was studied. The changes in polarity of
the PP surface were examined by measurement of contact angles and the
depth distribution of the diffusing atoms was deter-mined using Ruther
ford backscattering (RBS) and neutron depth-profiling (NDP). The sorpt
ion of the chlorides results in increase in the surface polarity. Irre
gular diffusion of LiCl into PP was observed.