Synthesisand properties of polyphenylenes
Polimery 2002, No 1, 1
A review with 36 refs. covering the synthesisroutes to polyphenylenes, e.g., the Friedel—Crafts reactions, oxidativecationic polymerization of benzene in the presence of AlCl3/CuCl2,anionic polymerization in the presence of BuLi, the Yamamoto reaction, Diels-Alderreactions, etc. Theproducts show broad MWD, various isomeric forms, colors, etc. Physicochemicalproperties (crystallinity, solubility, thermal resistance, electric conductivity)are described in relation to chemical structure. Service properties ofconstruction materials (pump and mixer parts, anticorrosive and ablativecoatings) produced from poly(p-phenylene)s (I) are also characterized. As thechain length is increased, the solubility and the melting temperature of linearI decreases and increases, resp. Conventional processing procedures areinapplicable to I. Powdered I compacted at 520 MPa at room temperature andsintered in nitrogen at 500 °C and 140 MPa for 1 h, yielded a product resistantto high-T hydrolysis and chemical agents. Polycondensation (300 °C) of terphenyl with m-benzene disulfone chlorideafforded soluble oligo(phenylene)s; these dissolved in organic solvents serveas adhesives in the production of laminates. Extremely pure I is appliedas a (semi)conductor.
Keywords: polyphenylenes, synthesis routes, processing,property data, applications