Polybenzimidazole-polyetherketoneketone blends and miscible blends

摘要

A process for producing a solution blend of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK). The PBI is mixed with sulfuric acid at a temperature between 40° C. and 80° C. for 30 minutes to 2 hours to produce a PBI solution then cooled to room temperature to form a cooled PBI solution. Then PEKK is added to the cooled PBI solution to form a mixture and that mixture is stirred from 30 minutes to 2 hours at room temperature to form a stirred mixture. The stirred mixture is poured into an excess of water being stirred swiftly to form an aqueous mixture. The aqueous mixture is filtered to produce a blend. The blend is washed with water and dried. The resulting blend can yield a blend in all proportion from 1/99 PBI/PEKK to 99/1 PBI/PEKK.

主权项

1. A process for producing a melt blend consisting of a polybenzimidazole (PBI) and a polyetherketoneketone (PEKK) which comprises the steps of:
pre-dry-mixing a PBI with a PEKK to obtain a dry mix; feeding said dry mix to an extruder with a plurality of heating zones; setting said heating zones in a temperature range of 240° C. to 410° C.; melting said dry mix blend as it passes through said extruder; and obtaining said melt blend of PBI/PEKK in all proportion within a range from 1/99 PBI/PEKK to 80/20 PBI/PEKK.