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Microdeformation properties of methylated polyamide-12

The microdeformation behavior of methylated PA-12 subjected to orientation was studied by X-ray diffraction. The crystal lattice parameters were determined. The elastic modulus E c along the polymer chain was found to be very low (E c ∼ 1.10-1.16 GPa). This feature was explained by the very large difference between the lengths of the most extended conformation and the real conformation of a chain in the lattice, which was -4 A per repeat unit of the total length 28.63 A. The main contribution to the deformation of the polymer is associated with amorphous layers, whose elasticity is even lower (E a = 100-120 MPa). The high foldedness of a chain in the lattice is apparently the result of the positive (in sign) and large magnitude of the coefficient of linear thermal expansion for the lattice along the polymer chain : α = (2-6) x 10 -4 K -1 . The absence of hydrogen bonding in the methylated polyamide provides more or less isotropic properties of the crystal lattice in the lateral direction with respect to chain alignment : Poisson ratio (-0.2) and coefficient of linear thermal expansion are approximately equal.