Patent ID: 8850985

Claim:
A blend comprising a polyphenylsulfone and a rigid-rod polyphenylene copolymer, wherein a room temperature notched Izod impact strength of the polyphenylsulfone is greater than about 10 ft-lb/in, as measured by ASTM D256-00 and a ratio of notched Izod impact strength at room temperature to notched Izod impact strength at about −40° C. of the polyphenylsulfone is less than about 4; and the rigid-rod polyphenylene copolymer is a copolymer of formula (1): (—Ar—/—Y—) n (1) wherein n is an integer of 4 or larger, a content of —Ar— in the rigid-rod copolymer is at least 0.1 mol %, and —Ar— consists of arylene repeat units of formula (2) and formula (3): a number average of the arylene repeat units (2) and (3) of —Ar— is greater than 4, a number average of para-arylene repeat units in formula (3) is between 1 and about 8; a number average of meta-arylene repeat units in formula (2) is greater than 1; x of each repeating phenylene unit of formula (2) and formula (3) is independently an integer from 0 to 4, with the proviso that at least 1 of every 100 repeat units has a pendent side group A; and A of each phenylene unit is independently selected from the group consisting of —F, —CN, —CHO, —COR, —CR═NR′, —OR, —SR, —SO 2 R, —OCOR, —CO 2 R, —NRR′, —N═CRR′, —NRCOR′, —CONRR′, and R, wherein R and R′ are each independently selected from the group consisting of H, alkyl, substituted alkyl, aryl, substituted aryl, heteroaryl and substituted heteroaryl, and optionally R and R′ if present together may form a bridging group; Y is nil or at least one divalent group selected from the group consisting of —Z—, —Z-Ph-, and -Ph-Z-Ph-, wherein Z is a divalent group selected from the group consisting of —O—, —S—, —NR—, —O(CO)—, —O(CO 2 )—, —(CO)NH(CO)—, —NR(CO)—, phthalimide, pyromellitimide, —CO—, —SO—, —SO 2 —, —P(O)R—, —CH 2 —, —CF 2 —, and —CRR′— and wherein Ph is ortho, meta or para-phenylene.