Supramolecular Mechanisms of Shear Deformation
upon Reorientation
of Flexible-Chain Semicrystalline Polymers

B. M. Ginzburg¹

Institute of Problems in Machine Science, Russian Academy of Sciences,
Bol’shoi pr. 61, St. Petersburg, 199178 Russia

Received May 27, 2002;
Revised Manuscript September 11, 2002

Abstract—For LDPE and PA-6, the supramolecular mechanisms of reorientation at sufficiently high angles rel-
ative to the direction of primary orientation (7075) and at a marked difference between the temperature of
primary thermal treatment T₁ (85 and 200°C, respectively) and the temperature of reorientation T₂ ~ 20°C were
studied. The above polymers are characterized by different values of critical shear angles and easiest slip sys-
tems of crystallites. In this case, one may also observe quite different X-ray patterns related to the development
of a new phase as induced by plastic deformation because, after the melting of initial crystallites, the recrystal-
lization of PE takes place, whereas PA-6 becomes, to a marked extent, amorphous. In PA-6, the crystallites that
are located favorably for their shearing along the planes containing H bonds are the first to experience the defor-
mation. In the region of elastic deformation, the fibrils are shown to be rotated as a whole due to interlamellar
slippage inside fibrils. Within the crystallites, shear deformation may either involve the rotation of macromol-
ecules or proceed without their rotation.

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