Ultra-drawing crystalline polymers under high pressure

Details Ultra-drawing crystalline polymers under high pressure Ultra-drawing crystalline polymers under high pressure

1980-09-26

1982-09-07

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including hydrostatic or liquid pressure

264291, B29C 2300

Patent

active

043483500

ABSTRACT:
A solid crystalline organic polymer is made into a filament, rod, or film by ultra-drawing it at a temperature within 70.degree. C. of but below its melting point at the operating pressure while subjecting the polymer during and immediately after drawing to a hydrostatic pressure of at least about 500 atmospheres applied by a fluid medium inert to the polymer. High-density polyethylene and isotactic propylene are preferred polymers. A draw ratio of at least 20:1, and as high as 60:1, may be used. Pressure may be up to 2500 atmospheres or more. The rate of drawing for polyethylene is above 500 percent per minute. The ultra-drawn products are transparent, essentially free of internal voids, and exhibit very high tensile moduli of elasticity, up to 65 to 70 Giga-Pascals in the case of polyethylene.

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"Ultrahigh Modulus PE. II", Jarecki et al., J. of Polym. Sci., Polym. Phys. Ed., vol. 17, 1611-1621 (1979).
"Ultrahigh Modulus PE I", Jarecki et al., Polymer, vol. 20, 1078-1082, Sep. 1979.

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