The article deals with the study of influence of the synthesis conditions on the molecu-lar weight of polyaryleneetherketones (PAEK), received with nucleophilic substitution reac-tion of activated aryl halide. The synthesis of PAEK with the nucleophilic substitution reaction carried out as partially hydrolyzed homopolycondensation of phenolates and aromatic dihal-ides containing a carbonyl group in the molecule and derivatives of polycondensation of ar-omatic bisphenols with activated aromatic dihalides, and aromatic nitro compounds. The nu-cleophilic substitution of halogen in aryldihalogens proceeds through formation of Meisen-heimer complex, where the negative charge of the electron-electron ring stabilizes the group. The high efficiency of the synthesis of PAEK with nucleophilic substitution reaction is mainly determined with several factors, the main of which are: 1) the structure of the starting mon-omers; 2) the nature of the solvent; 3) the nature of phenolate; 4) side reactions. For these materials it was revealed that the ratio of nucleophilic and electrophilic reagents has pro-nounced effect on the molecular weight of the obtained polymer, without affecting the poly dispersion. PAEK synthesis processes are optimized by controlling the replacement of some of the monomers, the temperature and concentration of reactants change. It was shown that the polyarylene ether ketones and copolymers have a high thermal heat resistance, mechani-cal properties. They show considerable heat resistance in air, capable of forming a transpar-ent film and melts. Thus, data of literature review show that the nucleophilic substitution re-action is promising for PAEK synthesis of various chemical structures and produces poly-mers having valuable properties.

Key words: synthesis, polyaryleneetherketone, polyarylether, nucleophilic substitution

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