Polysulfone (PPS), polyether ether ketone (PEEK), polysulfone (PSF), polyimide (PI), polyarylate (PAR), and liquid crystal polymer (LCP) are collectively known as the six major engineering plastics.PPS alloys include varieties mixed with resins such as PES (polyether sulfone), PC (polycarbonate), PPSK (polyphenylene sulfide ketone), PPO (polyphenylene oxide), PE (polyethylene), ABS, and acrylic rubber elastomers. The PPS/PC alloy enhances the impact strength of PPS and the flame-retardant properties of PC, mainly used in the mechanical, electronic electrical, and automotive industries. PPS/PPO alloys have been used for battery boxes and lids, while PPS/PE is employed in wire and cable communications. Copolymerization of PPS is also a method to improve the properties of PPS resins and expand their applications. Currently, copolymers such as PPS/polyarylether sulfone (PASS), PPS/polyarylether sulfone ketone (PPSK), and PPS/polyphenylene sulfone (PSF) have been developed, with the block copolymers with PSF already in industrial production and applied in the mechanical and automotive industries.