Halogenated polyaryletherketones with enhanced thermal stability

Abstract

Based on newly synthesized hydroquinone monomers, two series of halogenated polyaryletherketones, PEEKs and PEEKKs, were synthesized through nucleophilic aromatic substitution polycondensations. The chemical structures of the monomers and the polymers were carefully characterized using Fourier transform infrared and ¹H-NMR spectroscopies. Some interesting results about the relationships between the structure and properties of these polymers having comparable chemical structures were revealed for the first time. Despite the similar chemical structure of –F, –Cl and –Br substituted polyaryletherketones, they exhibited different thermal behaviors. The thermogravimetric analysis results showed that chlorinated PEEKK had the best thermal stability and its limited oxygen index (LOI) value was 42.80. The results indicated some of them will be promising high-performance polymers.

Keywords

polyaryletherketones halogenation thermal stability flame retardants

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