Syntheses and Thermal Properties of Polysilarylenesiloxanes with Sulfur Atom or Ketone Group in The Polymer Backbone

Abstract

We attempted to synthesize the polysilarylenesiloxanes, PSAS, with sulfur atom or ketone group in order to investigate effects of the introductions of them on thermal properties. PSAS having diphenyl sulfide moiety was successfully synthesized via the catalytic dehydro-coupling polymerization using palladium complex as a catalyst, which showed glass transition temperature, T_g, of 18°C and 5% weight loss temperature, T_5d, of 465°C in N₂. PSAS having acetal moiety was also successfully prepared via the same manner. Its T_g and T_5d are 42°C and 392°C, respectively. Additionally, this polymer exhibited a crystalline phase of melting point of 184°C, while a transformation from acetal into ketone group partially succeeded.