Abstract
The monomer containing sulfone and amide linkages, namely N,N'-bis(4-phenoxybenzoyl)-4,4'-diaminodiphenyl sulfone (BPBDAS), was conveniently prepared by the condensation of 4,4′-diaminodiphenyl sulfone with 4-phenoxybenzoyl chloride in N,N-dimethylacetamide (DMAc). Novel copolymers of poly (ether ketone biphenyl ketone ether ketone ketone) and poly (ether ketone sulfone amide) were synthesized by the modified Friedel-Crafts acylation solution copolycondensation of isophthaloyl chloride (IPC) with a mixture of 4,4′-bis (4-phenoxybenzoyl) biphenyl (BPOBBP) and BPBDAS. The copolymers obtained were characterized by different physico-chemical techniques. The copolymers with 10–25 mol% BPBDAS are semicrystalline and had increased T gs over the conventional PEEK and PEKK due to the incorporation of rigid biphenylene moieties, sulfone and amide linkages in the main chains. The copolymers III and IV with 20–25 mol% BPBDAS had not only high T gs of 182–185 °C, but also moderate T ms of 337–339 °C, having good potential for the melt processing. The copolymers III and IV had tensile strengths of 102.2–103.5 MPa, Young’s moduli of 2.65–2.76 GPa, and elongations at break of 17.5–18.9 % and exhibited high thermal stability and excellent resistance to organic solvents.
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The authors thank the National Natural Science Foundation of China (Project 21,264,010) and the Natural Science Foundation of Jiangxi Province of China (Project 20132BAB203015) for financial support.
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Wang, Y., Wang, P., Xu, Q. et al. Synthesis and properties of novel copolymers of poly(ether ketone biphenyl ketone ether ketone ketone) and poly(ether ketone sulfone amide). J Polym Res 21, 533 (2014). https://doi.org/10.1007/s10965-014-0533-1
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DOI: https://doi.org/10.1007/s10965-014-0533-1