Viscoelastic behavior of 1,3,5 tri α-naphthyl benzene (will the real TαNB please stand up)

Abstract

The mistaken identity of 1,3-bis (1-naphthyl)-5-(2-naphthyl) benzene (1,3α-5β TNB throughout the article) for 1,3,5-tris (1-naphthyl) benzene (TαNB throughout the article) is acknowledged and viscosities and recoverable creep compliances above Tg for the real TαNB are reported. In addition, semicontinuous creep measurements have been carried out below Tg while time dependent structural changes occurred as the material drifted towards an equilibrium state, following temperature decreases (“down jump”) and increases (“up jump”). With this new measurement scheme, the evolution of both viscosity and recoverable creep compliance can be followed during the isothermal and isobaric drifts toward equilibrium. Since the steady state creep compliance of TαNB is nearly independent of temperature in the temperature range from 61.8 to 72.4 °C, the recoverable compliance curves did not change shape with changes in temperature; i.e., thermorheologically simple behavior was observed.