High temperature polymer blends of poly(aryl ether ketone phthalazinone)

A composition, comprising:

• a) a first polymer blend comprising a polymer selected from the group consisting of poly(aryl ether ketone phthalazinone)s and combinations thereof;
• and
• b) a second polymer blend comprising poly(aryl ether ketone)s,
• wherein said first polymer blend is miscible or partially miscible in the second polymer blend, and
• wherein a miscible blend of the first and second polymer blends is characterized by a single glass transition temperature and a partially miscible blend of the first and second polymer blends is characterized by two separate glass transition temperatures Tg1 and Tg2 between the Tg's of the first and second polymer blends.

A composition, comprising:

• a) about 1 part by weight to about 99 parts by weight of a first polymer component selected from the group consisting of poly(aryl ether ketone phthalazinone)s and mixtures thereof;
• and
• b) about 1 part by weight to about 99 parts by weight of a poly(aryl ether ketone)s second polymer component,
• wherein said first polymer blend is miscible or partially miscible in the second polymer blend, and
• wherein a miscible blend of the first and second polymer blends is characterized by a single glass transition temperature and a partially miscible blend of the first and second polymer blends is characterized by two separate glass transition temperatures Tg1 and Tg2 between the Tg's of the first and second polymer blends.