Poly(aryl ether ketone)s (PAEKs) are a class of high‐performance engineering thermoplastics known for their excellent combination of chemical, physical and mechanical properties, and the synthesis of semicrystalline PAEKs with increased glass transition temperatures (Tg) is of much interest. In the work reported, a series of novel copolymers of poly(ether ketone ketone) (PEKK) and poly(ether amide ether amide ether ketone ketone) were synthesized by electrophilic solution polycondensation of terephthaloyl chloride with a mixture of diphenyl ether and N,N′‐bis(4‐phenoxybenzoyl)‐4,4′‐diaminodiphenyl ether (BPBDAE) under mild conditions. The copolymers obtained were characterized using various physicochemical techniques. The copolymers with 10–35 mol% BPBDAE are semicrystalline and have markedly increased Tg over commercially available poly(ether ether ketone) and PEKK due to the incorporation of amide linkages in the main chain. The copolymers with 30–35 mol% BPBDAE not only have high Tg of 178–186 °C, but also moderate melting temperatures of 335–339 °C, having good potential for melt processing. The copolymers with 30–35 mol% BPBDAE have tensile strengths of 102.4–103.8 MPa, Young's moduli of 2.33–2.45 GPa and elongations at break of 11.7–13.2%, and exhibit high thermal stability and good resistance to organic solvents. Copyright © 2010 Society of Chemical Industry

Based on the polycondensation of bifunctional 2,2′-diamino-4, 4′-bithiazole(DABT) and trifunctional 1,3,5-benzenetricarbonyl trichloride (BTC), a novel hyperbranched aromatic polyamide PBD was synthesized with excellent solubility and good thermal stability. The structure of the polymer was confirmed by FT-IR and 1 H NMR spectrum. The calculated degree of branching of our product was 52%. By exploring the influence of several different solvent systems, the yield of the polymer increased in the solvent system of DMAc/LiCl. Two kinds of metal complexes were obtained by chelation of the polyamide with Cu 2+ and Ni 2+ , and the metal contents of the complexes were determined by complexometric titration. The magnetic behaviors of the complexes were examined as a function of magnetic field strength at 5 K, and as a function of temperature (5-300 K) at a magnetic field strength of 2.4 × 10 6 A/m. The results indicated that the complexes were soft ferromagnetic materials with Curie-Weiss temperature at 102 K and 53 K, respectively. hyperbranched aromatic polyamide, synthesis, magnetic properties

A new monomer, 4,4(-bis(4-phenoxybenzoyl)diphenyl(BPOBDP), was synthesized via a two-step synthetic procedure. A series of novel poly(ether sulfone ether ketone ketone)/poly(ether ketone diphenyl ketone ether ketone ketone) copolymers were prepared by electrophilic Friedel-Crafts solution copolycondensation of isophthaloyl chloride (IPC) with a mixture of 4,4(-diphenoxydiphenylsulfone (DPODPS) and 4,4(-bis(4-phenoxybenzoyl)diphenyl (BPOBDP), in the presence of anhydrous aluminum chloride and N-methylpyrrolidone (NMP) in 1,2-dichloroethane (DCE). The copolymers with 10-50 mol% DPODPS are semicrystalline and have remarkably increased T g s over commercially available PEEK and PEKK. The copolymers with 40-50 mol% DPODPS had not only high T g s of 170-172-C, but also moderate T m s of 326-333-C, which are extremely suitable for melt processing. These copolymers have tensile strengths of 96.5-108.1 MPa, Young's moduli of 1.98-3.05 GPa, and elongations at break of 13-26% and exhibit excellent thermal stability and good resistance to acidity, alkali, and common organic solvents.

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