Effects of Hydrostatic Extrusion on the Thermal Properties of Amorphous Polymers
The feasibility of hydrostatic extrusion has been studied for various polymers: including polyimide, polysulfone, high-density polyethylene, low-density polyethylene, and polystyrene [1,2]. Recently, the hydrostatic extrusion of brittle amorphous polymers, poly(methyl methacrylate) (PMMA) and high-impact polystyrene (HIPS), was successfully performed by sheathing these polymers with rubber at ambient temperature, without back pressure [3,4]. Nakayama and Inoue  reported that the elongation of the PMMA as well as HIPS extrudates, when tested in tension under atmospheric pressure, exhibited a marked increase, and that this behavior was due to the rearrangement of the molecular chains in the direction of extrusion.
KeywordsMethyl Methacrylate Molecular Chain Amorphous Polymer Hydrostatic Extrusion Extrusion Speed
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- 1.J. A. Sauer and K. D. Pae, in Proc. of 4th Intern. Conference on High Pressure, Kyoto, Japan (1974), p. 17.Google Scholar
- 3.T. Nakayama and N. Inoue, in Proc. of 2nd Intern. Conference on Mechanical Behavior of Materials, Boston, Massachusetts (1976), p. 1305.Google Scholar
- 6.T. Ariyama, T. Nakayama, and N. Inoue, “Thermal Properties of Hydrostatically extruded Amorphous Polymers,” to be published.Google Scholar
- 9.S. Kranse and N. Roman, J. Polymer Sci. A 3, 1631 (1965).Google Scholar
- 10.E. V. Thompson, J. Polymer Sci. A-2 4, 199-(1966).Google Scholar
- 11.J. C. Wittmann and A. J. Kovacs, J. Polymer Sci. C 16, 4443 (1969).Google Scholar