METHOD FOR ANISOTROPY STUDY OF MATERIALS Russian patent published in 2008 - IPC G01N1/28 G01N3/46 

FIELD: investigation of structural changes in materials.

SUBSTANCE: pre-oriented polyethyleneterephthalate is preferably used as a polymeric material under study. Scratches are applied onto the surface of a product under study using a cutting tool made of quenched steel in the form of a rod having a variable cross-section that varies from cylindrical to conical one. The cone point is flanged, polished and the edge of the flanged portion is used as a working, cutting part of the tool. Moreover, the cutting tool is loaded within the limits from 0.5 to 1 kg and in the course of scratching the structure of the polymer is revealed at the supermolecular level of organisation of elements and also layer-by-layer in the area of deformation, i.e. within the scratch. The structure is studied by eye or by means of an optical microscope. The anisotropy of structural organisation is recorded from the difference in revealed structural organisation within the scratches, applied in different directions, as well as from the difference in deformability of the structural elements along the scratch or within different scratches. The structural anisotropy is estimated qualitatively on the surface and by layers from the formula: at P_c-const, where: A_s - structural anisotropy of polyethyleneterephthalate, in % E₁ - elongation along the deformation axis of the structural element within the scratch, applied in the direction of pre-orientation of the polymer or in a predetermined direction of the research, in mkm; E₂ - elongation along the deformation axis of the structural element within the scratch, applied in another direction, in mkm; P_c - load to the cutting tool in the moment of scratch applying.

EFFECT: capability of anisotropy of the structural condition of a hardly processable polymer - polyethyleneterephthalate, having antifriction and etch-resistance properties, as well as extending the capabilities of the method of scratching and layer-by-layer study of the structural organisation of the polymer.

1 dwg, 12 ex