Abstract
Poly(p-phenylene-1,2,4-oxadiazole) was synthesized by the solid-state 1,3-dipolar cycloaddition polymerization of p-cyanobenzonitrile N-oxide under high pressure. The high pressure polymerization was carried out by using a piston cylinder type hot-pressing apparatus. Pressure and temperature accelerated the polymerization, and higher pressure (up to 750 MPa) and higher temperature (up to 150°C) afforded the polymer with an inherent viscosity around 0.5 dl g−1. The crystallinity and thermal behavior of the polymer were discussed in connection with the polymerization conditions.
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