Study On Synthesis Of New Soluble Poly (aryl Ether Nitrile) (ketone)

High temperature resistant aromatic polyethers have been known for their superior performance characteristics in a great number of application areas. Attempts have been made to introduce pendent cyano groups to the backbones of polyethers containing sulfone, carbonyl or ether linkages. The pendent cyano group could not only contribute to the thermal stability of the polymer, but also present a potential cross-linking site.Poly(phthalazinone ether ketone)s is a novel thermalstable aromatic polyether performing remarkable thermal resistance ,excel lent mechanical properties and good solubility. The objective of this work is to synthesis new poly (phthalazinone ether nitrile)s. The pendent cyano groups are expected to help to prove the thermal stability of the polymer, promote the adhesion with various materials, and provide a potential site for further functionalization.High molecular weight poly (arylene ether) s containing pendent cyano groups (poly(phthalazinone ether nitrile ketone)s) (PPENK) and (poly(phthalazinone ether nitrile)s) (PPEN) are prepared by the polycondensation of 4-(4-hydroxylphenyl)-phthalazine-l-tone, 2,6-dichlorobenzonitrile, 4,4-diflurophenone , hydraquinol and bisphenol A in sulfolane in the presence of potassium carbonate. The reaction temperature and time are carefully studied.The Tgs of the copolymers range from 199 to280. The degradation temperature of 5% weight loss occurr at about 490癈 in nitrogen. The polymer show excellent solubility in some aprotic polar solvent such as CHCl and NMP. New poiymers show excellent thermal stabilities, electrical properties and mechanical propertities. All the copolymers are processable from solution to yield transparent and flexible film. At elevated temperatures the pendent cyano groups undergo crosslinking reactions yielding products with high solvent resistance.