Process for producing shaped articles from an acetylenic polymer

Details Process for producing shaped articles from an acetylenic polymer Process for producing shaped articles from an acetylenic polymer

1973-09-04

1976-01-20

Hayes, Lorenzo B.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

260 324, 260 336UA, 260 338UA, 423448, 423449, B29C 2500, C08K 503

Patent

active

039339572

ABSTRACT:
When a hot, homogeneous solution containing at least 4 percent by weight of a copolymer of a diethynylbenzene and a dipropargyl ether of a dihydric phenol in nitrobenzene or a liquid halobenzene solvent is allowed to cool in contact with a shaping surface, a shaped gel is formed. Contacting the shaped article with a lower alkyl ketone which is a nonsolvent for the acetylenic polymer but in which the halobenzene is soluble and then allowing the shaped object to dry causes the gel to shrink isotropically so that it retains the shape, although diminished in size, which it assumed on solidifying. If the halobenzene solvent is crystalline at room temperature, the solvent crystallizes in the polymer matrix as it cools. Extraction with a lower alkyl ketone or sublimation of the solvent crystals produces a shaped article having a microporous structure. The shaped articles are readily converted by heating in an inert atmosphere to the same shaped carbon articles which can be amorphous, vitreous or graphitic depending on the heating schedule and the maximum temperature to which the articles are heated.

REFERENCES:
patent: 3300456 (1967-01-01), Hay
patent: 3709863 (1973-01-01), White et al.

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