Synthesis and Characterization of New Copoly(arylene ether)s Containing Naphthalene or Naphthalene/1,3,4-Oxadiazole Units

Summary Series of new copoly(arylene ether)s containing naphthalene or naphthalene/1,3,4-oxadiazole units have been obtained by polycondensation in solution starting from the following systems of monomers: 1,5 or 2,6-bis(4-fluorobenzenesulfonyl) naphthalene / 2,6-bis(4-fluorobenzoyl)naphthalene, 1,5 or 2,6-bis(4-fluorobenzen sulfonyl)naphthalene / 2,2-(oxydi-4,1-phenylene)bis5-(4-fluorophenyl)-1,3,4- oxadiazole] and 2,6 bis-(4 fluorobenzoyl)naphthalene/2,2-(oxydi-4,1-phenylene)bis 5-(4-fluorophenyl)- 1,3,4-0xadiazole]. Hydroquinone and 4,4dihydroxy benzophenone have been used as aromatic dihydroxy compounds. The copolymers, obtained in quantitative yields, possessed inherent viscosities in the range 0.28-0.58 dl g^-1, had good thermal stability (10% weight loss temperatures were above 460°C both in nitrogen and air) and high glass transition temperatures (in the range 190-210°C). They have been characterized by infrared analyses, GPC and wide-angle X-ray diffraction. The copolymer property-structure relationships were studied and the properties have been compared with those of the corresponding homopolymers.