Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE Bulky and non-coplanar side groups were introduced into the backbone of PEEK to enhance the heat deflection temperature and dimensional stability.

ABSTRACT
A series of copolymerized Poly(aryl ether ketone) (co-PAEK) materials were synthesized through the copolymerization of hydroquinone (HQ), phenolphthalein anilide (PPA), and 4,4′-difluoro diphenylmethanone (DFBP). When the feed ratio of HQ to PPA varied from 0:10 to 5:5, the resulting copolymers were amorphous and showed good solubility in organic solvents. While, when the HQ to PPA ratio reached 7:3 or higher, the copolymers exhibited a semi-crystalline structure. By incorporating bulky and non-coplanar side groups into the backbone of polyetheretherketone (PEEK), the glass transition temperature (T

g
) significantly increased from 143°C to 246°C, and the heat deflection temperature (HDT) rose from 151°C to 237°C. The creep tests conducted at 150°C demonstrated that the co-PAEKs possess superior dimensional stability compared to PEEK. These enhanced properties suggest that the co-PAEKs have potential applications in areas such as polymer bearings and gears.