METHOD FOR STABILIZING POLYPHENYLENE SULFIDE AGAINST THERMAL DEGRADATION AND OUTGASSING OF ORGANIC SUBSTANCES.

摘要

The object was to develop an absorber which is approximately just as thermally stable as polyphenylene sulphide (PPS), can be processed in the same temperature range, contains acceptor groups for the sulphur-containing gases and is readily miscible with PPS. In order to stabilise PPS against thermal degradation and emission of organic substances, a polymer containing aromatic keto groups or a polyimide in combination with activated charcoal is added to the PPS. The activated charcoal may also be used alone, but in this case the effective temperature range is smaller. The same effect is achieved by adding polymers containing aromatic amine groups with polyamides and by mixing suitable basic units in the form of a copolymer into the PPS chain. The stabiliser usually employed is added to prevent screw corrosion at high processing temperatures.