Abstract
The behaviour of semi-dilute solutions of superhigh molecular polyethylene under shear flow conditions and the stretching of the xerogels obtained from them are studied. The solutions have a high degree of structuring, which results in viscoplastic behaviour. The shear stress at which extrudates are obtained determines the level of the longitudinal stressein stretching of the xerogels. The stress-strain curves for stretching conditions can be divided into two parts, in which the rates of stress increase are different. The samples obtained at different extension ratios have different structural organization, which is manifested on heating under isometric conditions. An orthorhombic phase is characteristic of the first part, and a pseudo-hexagonal phase of the second.
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