Preparation of high-modulus, high-strength linear polycondensate

Details Preparation of high-modulus, high-strength linear polycondensate Preparation of high-modulus, high-strength linear polycondensate

1988-06-23

1989-06-27

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

264 85, 2642356, 2642358, 264291, B29C 5500

Patent

active

048427896

ABSTRACT:
Described and claimed is a process for obtaining high-modulus, high-strength linear polycondensates, e.g., polyamides, comprising the sequential steps drawing at room temperature, isothermal annealing at 180.degree.-270.degree. C., a second drawing at room temperature, and a second isothermal annealing at 120.degree.-260.degree. C., an orientation degree after the second drawing being 20-25.

REFERENCES:
patent: 4042569 (1977-08-01), Bell et al.
patent: 4082731 (1978-04-01), Knopka
Capaccio et al., "The Role of Crystallinity & Morphology in the Preparation of Ultra-Highly Oriented Polyethylene," ASC Poly. Prep. 8, No. 2 (1977), pp. 343-345.
Mead et al., "The Influence of Initial Morphology on the Physical & Mechanical Properties of Extruded High Density Polyethylene Fibers," Flow Induced Crystallization in Polymer Systems, R. L. Miller, Ed., Cordon & Breach Science Publishers, N.Y., London, Paris (1979), pp. 139-167.
Cifferi et al., "Solution Spinning of Rigid & Semi-Rigid Polymers," Ultra-High Modulus Polymers, Applied Science Publishers, London (1979), Frontispiece pp. 203-211.
M. P. W. Wilson, "Shrinkage & Chain Folding in Drawn Poly (ethylene terephthalate) Fibres," Polymer 15 (1974), pp. 277-282.

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