The dinitriles Ⅰ-Ⅲ with benzofuran

benzothiophene andquinoline ring were synthesized. The polymerization rates of these dinitriles with 4 mole percent of zine chloride as catalyst at 300℃ were measured by infrared spectroscopy. The rate constants are 1.61

2.63 and 3.09 l·mol-1sec-1

respectively. The TGA and isothermal weight loss at 371℃ in air of these three polymers were also measured

and the results indicated that the oxidative thermal stability of these polymers is not as good as that of the polymer of the dinitrile containing benzothiazole ring.