Dioxane liquid temperature range

Measurement of the dielectric constant, D, of dioxan/water mixtures Thermally equilibrate a IpF capacitance ceil filled with air in a thermostat for 20-30 minutes. Measure the capacitance Cq using a Universal Dielectrometer and record the temperature on a precision thermometer. Fill the cell with a calibrating liquid e.g water, whose dielectric constant, D,., is accurately known over a temperature range. Thermally equilibrate at the same temperature and then measure the capacitance, Q. Calculate the measuring capacitance. Cm, of the cell from the relation ... 

The homopolymer, prepared by polymerization in liquid ammonia with sodium initiator at-77 °C, is insoluble in acetone, but it is soluble in dimethylformamide. When it is formed with lithium in liquid ammonia, at -75 °C, the molecular weight of the product increases with monomer concentration and decreases with initiator concentration. If, however, potassium initiates the reaction rather than lithium, the molecular weight is independent of the monomer concentration. " " Polymethaciylonitrile prepared with n-butyllithium in toluene or in dioxane is crystalline and insoluble in solvents like acetone. When polymerized in petroleum ether with /i-butyllithium, methacrylonitrile forms a living polymer. Highly crystalline polymethacrylonitrile can also be prepared with beryllium and magnesium alkyls in toluene over a wide range of temperatures. 

---