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Abstract

The behavior of synthetic polymers under high pressure has been studied extensively by many research workers from scientific and practical point of view. These studies may be classified into two categories. The first includes those studies which treat the relation between pressure and volume at various temperatures (1–12). In the course of studies being made of equilibrium state the time-dependent characteristics of P-V-T relation were found (4, 5, 6, 8, 11). Melting temperatures of polymers were measured as a function of pressure (4, 5, 6, 13, 14, 17). The mechanical properties (15, 16), density (4, 5, 6, 8, 14), crystalline and supermolecular structure (17–21) of polymers solidified under high pressure have also been the subjects of studies. Further, the real and imaginary parts of complex viscosity of pressurized polymer liquids have been studied (22–26). The second category, on the other hand, deals with extrusion properties of polymers under pressure. Conventionally, polymers have been processed by screw- or ram-extruders, but particular attention should be paid, in addition, to the hydrostatic extrusion considering its future development.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1975

Authors and Affiliations

  • M. Horio
    • 1
  1. 1.Dept. of Polymer ChemistryFaculty of Engineering Kyoto UniversityKyotoJapan

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