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7656635 
Journal Article 
Poly(aryl ether ketone ketone)s containing diphenyl-biphthalazin-dione moieties with excellent thermo-mechanical performance and solubility 
Liu, Q; Zhang, S; Wang, Z; Li, Nan; Chen, Y; Xu, P; Jian, X; , 
2021 
Yes 
European Polymer Journal
ISSN: 0014-3057 
PERGAMON-ELSEVIER SCIENCE LTD 
OXFORD 
110205 
WOS:000605760100026 
High molecular weight poly(aryl ether ketone ketone)s comprising diphenyl-biphthalazin-dione moieties (P-MDs) were prepared through the solution condensation. The structure of polymers was characterized via nuclear magnetic resonance spectra and infrared absorption spectrum. The effects of mixed diphenyl-biphthalazin-dione (mDBD) monomer on performance of polymers were investigated. The mDBD units containing side phenyl groups endow polymer with solubility and controllable contact angle. The resultant polymers perform a fine thermo-stability in both nitrogen and air, presenting an excellent thermal resistance with glass transition temperature in the range of 253-333 degrees C. Simultaneously, the polymers exhibit a favorable solubility in 1,1,2,2-tetra-chloroethane and N-methylpyrrolidone, showing fine film-formation performance. Polymers possess excellent mechanic performance with the tensile strength up to 84 MPa, the Young's modulus above 1.5 GPa and the retention of storage modulus at 250 degrees C as high as 70%. Additionally, the contact angle of water-drops with polymer films is within the range of 73.5 degrees-89.1 degrees.