Consolidation and molding of polybenzazole-containing materials

Details Consolidation and molding of polybenzazole-containing materials Consolidation and molding of polybenzazole-containing materials

1992-02-05

1993-09-14

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Plural, intermittent pressure applying

264126, 264319, 26433111, 528342, B29C 4314

Patent

active

052446174

ABSTRACT:
A process for consolidating/molding a material made of (a) block copolymers of rigid or semi-rigid PBZ with thermoplastic polymers, (b) block copolymers of rigid PBZ with semi-rigid PBZ, (c) molecular composites of rigid or semi-rigid PBZ with thermoplastic polymers, (d) molecular composites of rigid or semi-rigid PBZ with non-rigid PBZ polymers or (e) semi-rigid PBZ polymers, whereby the material, in its substantially acid-free, wet coagulated state, and in the form of a plurality of films or film layers, filaments or fibers, powders or granules, film layers, filaments or particulate, is subjected to a first pressure P1 which is sufficient to provide a substantially void-free consolidated material upon molding. Heat and a second pressure P2 is then applied to the wet coagulated material in amounts sufficient to fuse the films or film layers, filaments or fibers, powders, or granules into a single entity. Prior tot he application of the first pressure P1, surface water remaining on the material is removed, leaving the material with sufficient water to plasticize it.

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