Synthesis and properties of novel copolymers of poly(ether ketone ether ketone ketone) and poly(ether ketone ketone ether ketone ketone) containing 1,4-naphthylene moieties

Abstract

A new monomer, 1,4-bis(4-phenoxybenzoyl)naphthalene (BPOBN), was conveniently synthesized via a simple synthetic procedure from readily available materials. A series of novel copolymers of poly(ether ketone ether ketone ketone) and poly(ether ketone ketone ether ketone ketone) containing 1,4naphthylene moieties were prepared by the Friedel-Crafts acylation solution copolycondensation of terephthaloyl chloride (TPC) with a mixture of BPOBN and 4,4 0 -diphenoxybenzophenone (DPOBPN), over a wide range of BPOBN/DPOBPN molar ratios, in the presence of anhydrous AlCl 3 and N-methylpyrrolidone in 1,2-dichloroethane. The copolymers with 10-40% BPOBN are semicrystalline and had remarkably increased T g s over the conventional PEEK and PEKK due to the incorporation of 1,4-naphthylene moieties in the main chains. The copolymers with 30-40 mol% BPOBN had not only high T g s of 176-1778C, but also moderate T m s of 332-3388C, which are suitable for the melt processing. These polymers had tensile strengths of 101.5-104.7 MPa, Young's moduli of 2.49-2.65 GPa, and elongations at break of 13.3-15.7% and exhibited high thermal stability and excellent resistance to organic solvents. POLYM. ENG. SCI., 56:566-572, 2016.

Synthesis of Aromatic Polyether Ketones by Electrophilic Substitution

“…The combination of rigid and flexible sections in the polymer chain is one of the main approaches leading to an increase in the glass transition temperature and thermal stability of the synthesized copolymers, however, SPAEK synthesized by the nucleophilic substitution method were studied to a large extent in this area [29][30][31][32][33][34][35][36]. Therefore, the authors of [12,37,52,53,57,58,63,64] synthesized SPAEK with 2,6-and 1,4-naphthalene fragments by low-temperature polycondensation by nucleophilic substitution:…”

Fabrication of High Thermally Conductive and Electrical Insulating Composites by Boron Nitride‐Nanosheet‐Coated PEEK Fiber

“…Four peaks for PEEK were widely reported in the range of 18°-30°according to the literature. [53,54] Four peaks at 18.7°, 20.6°, 22.7°, and 28.4°are observed, as shown in Figure 7a. The diffraction peak, located at 20.6°, is sharper compared to pure PEEK fiber, suggesting that the orthorhombic crystal structure of PEEK becomes more ideal by hot-press sintering, similar to literature reports.…”