Synthesis and properties of novel poly(aryl ether ketone)s containing both 2,6-naphthylene moieties and amide linkages in the main chains

摘要

A new monomer, 2,6-bis(4-phenoxybenzoyl)naphthalene (BPOBON), was easily synthesized via simple synthetic procedures from readily available materials. A series of novel poly(aryl ether ketone)s containing both 2,6-naphthylene moieties and amide linkages in the main chains were prepared by the Friedel-Crafts acylation solution copolycondensation of isophthaloyl chloride with a mixture of BPOBON and N,N'-bis(4-phenoxybenzoyl)-1,4-phenylenediamine (BPBPPD), over a wide range of BPOBON/BPBPPD molar ratios, in the presence of anhydrous AlCl_3 and N-methylpyrrolidone in 1,2-dichloroethane. All the polymers are semicrystalline and had remarkably increased T_gs over the conventional PEEK and PEKK due to the incorporation of naphthalene and amide linkages in the main chains. The polymers with 50-70 mol% BPOBON had not only high (T_g)s of 179-186℃, but also moderate (T_m)s of 321-328℃, which are very suitable for the melt processing. These polymers had tensile strengths of 101.5-107.1 MPa, Young's moduli of 2.13-2.39 GPa, and elongations at break of 11.8-13.7% and exhibited excellent thermal stability and good resistance to organic solvents.