Synthesis and characterisation of new polyamides containing 6,6 '-oxy or 6,6 '-carbonyldiquinoline units

A series of new polyamides has been prepared from new monomers containing 6 ,6'-oxy or 6,6'-carbonyl diquinoline units with Various aromatic diamines b y the phosphorylation route. The polymers, having inherent viscosity in the range 0.29-1.04 dl g(-1), were obtained in quantitative yield, had excelle nt thermal stability as shown by 10% weight loss temperatures in nitrogen a nd air (above 435 and 420 degreesC, respectively) and high glass transition temperatures (in the range of 230-310 degreesC). Some of them were semicry stalline. The polymers were characterised by elemental and infrared analysi s and GPC. The solubility in N-methylpirrolidinone was very good for all po lymers. The properties of these polymers are compared with those of corresp onding polyamides having only one quinoline ring per repeat unit and with t hose of some other polymers reported in literature. (C) 2001 Elsevier Scien ce Ltd. All rights reserved.