Abstract
Polymer liquids display a number of properties characteristic of solids: slippage along the wall, the appearance of cracks in the material during flow, brittle fracture under tension, etc. The combination of these phenomena encountered in the flow of polymers through capillaries, accompanied by a number of other effects (oscillations and waves on the surface of a jet emerging from a capillary, crystallization of polymers in a capillary, etc.), has been referred to in the literature as “destruction of melt.” The bibliography devoted to this question, which is important for many polymer-processing methods, is very extensive (see, for example, [1]). The behavior of polymer liquids has been observed recently for melts of polymers with a narrow molecular-weight distribution (MWD) [2, 3] for conventional types of deformation. In [4] the hardening effect was studied for the case of the extraction of polyoxyethylene from a tank by means of a rotating drum. The length of the liquid jets so obtained was as much as half a meter. In the present study we propose a theoretical description of the above-mentioned effects for two of the situations most often found in practice: simple shear and simple tension.
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Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 4, pp. 86–93, July–August, 1976.
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Leonov, A.I., Lipkina, É.K. & Prokunin, A.N. Theoretical description of the phenomenon of loss of fluidity in polymer liquids subjected to intensive deformation. J Appl Mech Tech Phys 17, 523–529 (1976). https://doi.org/10.1007/BF00852004
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DOI: https://doi.org/10.1007/BF00852004