Rheological Properties of the Molten Silicon Containing Arylacetylene Resin and Its Blends

Abstract: The rotary viscometer and rheometer were used to study the rheological behaviors of the silicon containing arylacetylene resin (PSA) and the blended resin with propargyl containing benzoxazine (P BZ). The mathematical model of viscosity composition temperature of the resins was established. The results show that the processing window of PSA resin is enlarged by blending with P BZ. The viscosity of the molten PSA reduced with addition of P BZ and increasing temperature in the range of 90—130 ℃. The processing applicability of PSA was enhanced by blending with P BZ. The viscosity of the molten PSA resin can be predicted and modulated by the mass fraction of P BZ and processing temperature. The rheological properties of the molten PSA and its blends behave as a Newtonian flow. The storage modulus and complex viscosity of the molten PSA resin decreased with addition of P BZ. The dual Arrhenius equation was used to fit the isothermal viscosity time variation of the molten PSA and its blends in 160—190 ℃. The deduced experiential models indicate that the gel time of PSA is prolonged and the gel activation energy of PSA reduce from 84.50 kJ/mol to 54.83 kJ/mol when 10% mass fraction of P BZ are added.