Abstract: Fibers may be prepregged with a dope containing a thermoplastic polybenzazole block copolymer. The prepreg may be contacted with water or another nonsolvent to coagulate the polymer and form a matrix composite.

Abstract: An improved, essentially scrap-free, solid-phase process for making thermoplastic articles directly from resinous powder. The process can be particularly advantageous to forming large parts from thermoplastic resinous powders. The method essentially comprises taking resinous powder, briquetting the powder, sintering the briquette, repressing the powder in a warm state and then shaping the briquette into a preform or a blank which can then be thermoformed into a resulting container or other product, assuming the blank itself is not the desired end product. Alternatively, sintering can take place after repressing with preheating of the briquette prior to the repressing step.