| Research Abstract |
Diphenyl disulfide (DPS) which has been a non-polymerizable monomer is oxidatively polymerized via cationic active species to yield poly (p-phenylene sulfide) (PPS). Oxidation of DPS in acidic media resulted in the formation of phenylbis (phenylthio) sulfoniumcation, which substitutes electrophilically on the phenylene ring of sulfides. The electrophilic substitution and the oxidation are continuously repeated to yield pure and linear PPS.In the presence of a catalytic amount of vanadium complexes, O_2-oxidative polymerization of DPS proceeds through two-electron transfer under the atmosphere at room temperature. A new one-pot synthesis of PPS was also established as a method by using more simple row materials, such as p-xylene and sulfur chloride, as a monomer. The polymerization is applicable to synthesize a variety of new poly (arylene sulfide)s which bear high performances.
In this research project, we found a new reaction that methyl phenyl sulfide was oxidatively polymerized to yield poly (phenylsulfonium cation), which is soluble in common organic solvent at room temperature. The polysulfonium is feasible to convert to the corresponding polythioether with a high molecular weight and a high melting temperature.
|
