Synthesis and properties of polyetheretherketone-based copolymers with controlled degree of crystallinity

Copolymers based on polyetheretherketone (PEEK) were synthesized by nucleophilic polycondensation with the introduction of 4,4'-dichlorodiphenylsulfone (DCDPS) as a comonomer in amounts of 5, 10, and 15 mol%. The effect of potassium carbonate concentration and synthesis temperature on the polycondensation kinetics of copolymers was investigated. The structure of the obtained copolymers has been confirmed by IR spectroscopy. The effect of the amount of DCDPS and the molecular weight on such characteristics of copolymers as the degree of crystallinity, glass transition, melting, and crystallization temperatures has been studied using differential scanning calorimetry. It has been shown that varying the content of DCDPS allows for a controlled change in the degree of crystallinity of the copolymers, which opens up opportunities for targeted regulation of their technological and operational properties.

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