Structure and Time-Dependent Mechanical Behavior of Highly Oriented Polyethylene

Springer Science and Business Media LLC - Tập 3 - Trang 319-334 - 1999
G.K. Elyashevich1, E.A. Karpov1, O.V. Kudasheva1, E.Yu. Rosova1
1Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg, Russia; E-mail

Tóm tắt

The structures of polyethylene films and film fibers, having different orientation degrees and prepared by orientational crystallization and orientational drawing, have been investigated by electron microscopy and X-ray diffraction and specific features of the supermolecular structures and differences in the mechanical properties of the samples obtained by these methods have been discovered. Thermomechanical tests have also shown that samples prepared by the two techniques demonstrate different behavior on heating. The time-dependent behavior of the mechanical properties – tensile strength and elastic modulus – have been studied. The phenomenon of slow relaxation of the elastic modulus has been observed for the samples obtained by orientational drawing. It is shown that a long-term decrease in the elastic modulus can be attributed to the presence of structural elements capable of relaxation due to a weak connection between them, their small sizes, and the inhomogeneity of the sample deformation during orientational drawing.

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Tài liệu tham khảo

Baranov, V.G., ‘Orientational crystallization of polymers’, Khimicheskie Volokna 3, 1977, 14–21.

Baranov, V.G., Frenkel, S.Ya., Gromov, V.I., Volkov, T.I. and Zurabuan, R.S., ‘Formation of supermolecular structure of semicrystalline polymers under molecular orientation’, J. Polym. Sci.: Part C 38, 1972, 61–71.

Elyashevich, G.K., ‘Thermodynamic and kinetics of orientational crystallization of flexible-chain polymers’, Adv. Polym. Sci. 43, 1982, 205–245.

Elyashevich, G.K., Baranov, V.G. and Frenkel, S.Ya., ‘Thermodynamic of crystallization of macromolecules of various degree of coiling’, J. Macromol. Sci. 13B, 1977, 255–289.

Elyashevich, G.K., Lavrentyev, V.K. and Streltses, B.V., ‘Orientation and specific structure details of orientationally crystallized polyethylene samples’, in Abstracts of VIII International Microsymposium on Morphology, Institute ofMacromolecular Chemistry, Ukranian Academy of Sciences, Kiev, 1989, 92.

Elyashevich, G.K., Karpov, E.A., Rozova, E.Yu., Streltses, B.V., Marikhin, V.A. and Myasnikova, L.P., ‘Orientational crystallization and orientational drawing as strengthening methods for polyethylene’, Polym. Engrg. Sci. 33, 1993, 1341–1351.

Elyashevich, G.K., Karpov, E.A., Lavrentyev, V.K., Poddubny, V.I., Genina, M.A. and Zabashta, Yu.F., ‘Changes in amorphous phase of polyethylene upon high extension’, Internat. J. Polym. Mater. 22, 1993, 191–201.

Frenkel, S., ‘Structure and properties of highly oriented polymer fibers’, J. Polym. Sci. 58, 1977, 195–302.

Hoffman, J.D., Williams, G. and Passaglia, E., ‘Analysis of α-, β-and γ-relaxation in polychlortrifluoroethylene and polyethylene: Dielectric and mechanical properties’, in Transitions and Relaxation in Polymers, R.G. Boyer (ed.), Interscience Publisher, New York, 1966, 187–264.

Karpov, E.A., Rosova, E.Yu. and Elyashevich, G.K., ‘The changes in elastic properties of oriented polyethylene samples under loading’, Polym. Sci. 36A, 1994, 950–954.

Korsukov, V.E., Marikhin, V.A., Myasnikova, L.P. and Novak, I.I., ‘The influence of supermolecular structure on linear polyethylene drawing’, J. Polym. Sci., Polym. Symp. 42, 1973, 847–853.

Myasnikova, L.P. ‘Hochstorientierte Polymere – Mechanische Eigenschaften und Strukturell Besonderheiten’, Plast. Kautschuk 33(4), 1986, 121–128.

Peterlin, A., ‘Drawing and extrusion of semi-crystalline polymers’, Colloid Polym. Sci. 265, 1987, 357–382.

Sukhanova, T.E., Sidorovich, A.V., Goryainov, G.I., Mikhailov, G.M. and Mitterpakhova, M., ‘Morphology investigations of khitin fiber’, Vysokomolek. Soedin. 31B, 1989, 381–384.

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Springer Science and Business Media LLC

Tập 3

319-334

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