Abstract: The structures of Nylon-1010 with different draw ratio have been investigated by usingSmall-Angle X-ray Scattering(SAXS). It is shown that by using a simple geometrical cons-truction the following structure parameters can be directly derived from the correlation func-tion the long period(L), the thickness of the crystalamorphous interphase (d_tr), the lamellarthickness(d), the "invariant"(Q), the specific inner surface (O_s), and the electron densitydifference between the core of the crystallites and the amorphors matrix(η_c - η_a). The crystalline Nylon-1010 is probably consisted of three-phases: a crystalline layer, anamorphous layer and a transition zone between amorphous(A_o) and crystalline layer(d_o).

Key words: Nylon-1010, SAXS, one-dimensional electron density correlation function, crystal-amorphous interphase, long period