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Melting Temperature of Mixtures

A variety of techniques for measuring the melting temperature of mixtures have been described. With some of these techniques one cannot be certain that the recorded temperature is the true equilibrium temperature unless a large amount of the solid phase is present. It is then necessary to analyse the liquid phase immediately after taking a temperature reading.  [Pg.26]

Stokes has used an isothermal dilution calorimeter (to be described in detail later) as an adiabatic calorimeter to follow the equilibrium melting curve of a mixture until the last trace of solid disappears. At this point the composition of the mixture is precisely known from data on its preparation. A brief summary of the method follows pure solvent is thoroughly degassed, in situ, in the calorimeter and the vapour space is removed by the addition of a known volume of mercury. The calorimeter is placed in a thermostat controlled at about 0.5 K below the melting temperature of the solvent. It is stirred continuously. After supercooling the solvent freezes as shown by the reversal of the time- [Pg.26]

4 mA is then passed through a 100 Q heater in the calorimeter and the time-temperature plot is recorded. On complete melting there is a rapid linear increase in temperature. The melting temperature can readily be determined to within [Pg.27]

The activity coefficient of the solvent, defined by InA = n RT at the melting temperature of the solvent is given by [Pg.27]


The melting temperatures of mixtures of benzil and benzoin have been recorded by Vanstone, who showed that the maximum possible depression is about 10°. [Pg.7]

An uneducated guess as to the melting temperatures of mixtures of minerals A and B. [Pg.509]

The second type is the quaUty of combustion. A misfire or partial misfire of the air/fuel charge in the combustion chamber causes the unbumed air and fuel mixture to pass to the catalyst, where combustion occurs. The temperature rise from combustion in the catalyst is considerable. Two misfiring cylinders in a four-cylinder engine could cause the catalyst to approach the melting temperature of the substrate (1465°C) (69). [Pg.489]

Elastomer-plastic blends without vulcanization were prepared either in a two roll mill or Banbury mixer. Depending on the nature of plastic and rubber the mixing temperature was changed. Usually the plastic was fed into the two roll mill or an internal mixer after preheating the mixer to a temperature above the melting temperature of the plastic phase. The plastic phase was then added and the required melt viscosity was attained by applying a mechanical shear. The rubber phase was then added and the mixture was then melt mixed for an additional 1 to 3 min when other rubber additives, such as filler, activator, and lubricants or softeners, were added. Mixing was then carried out with controlled shear rate... [Pg.465]

Eutectic temperature Melting temperature of an alloy with a eutectic mixture it is at the interaction of two or more liquid solubility curves. [Pg.636]

The mixture of oligomers was heated in a flask to 200°C in a mineral bath (the DSC peak melting temperature of the oligomers was 230°C) while stirring and removing water formed with a vacuum pump to form high-molecular-weight nylon-6,6. [Pg.567]

The melting points of mixtures and solutions depend on the nature and the relative amount of each component of the solution. They are, however, lower than those of the separate components. Solder, for example, an alloy of tin and lead, melts at 183°C, a much lower temperature than either of its components tin melts at 231 °C and lead, at 328°C. [Pg.38]

Roozeboom type I is obtained whenever the Gibbs free energy curve of the melt initially touches that of the mixture in the condition of pure component. This takes place at the melting temperature of the more refractory component (T2 in... [Pg.455]

At one stage experimental convenience led us to distil the monomer onto frozen initiator solution so that initiation took place at the melting temperature of the monomer-toluene-THF mixture. Even though the temperature rose within a few minutes to 230 ... [Pg.188]

Fig. I. Melting temperatures of (a) PVFt-PVF mixtures and of (b) VFj-VF copoly-mersjfrom Natta, G., et al. J. Polymer Sd., Part A, 3, 4263 (1965))... Fig. I. Melting temperatures of (a) PVFt-PVF mixtures and of (b) VFj-VF copoly-mersjfrom Natta, G., et al. J. Polymer Sd., Part A, 3, 4263 (1965))...

See other pages where Melting Temperature of Mixtures is mentioned: [Pg.28]    [Pg.26]    [Pg.509]    [Pg.74]    [Pg.133]    [Pg.133]    [Pg.28]    [Pg.26]    [Pg.509]    [Pg.74]    [Pg.133]    [Pg.133]    [Pg.228]    [Pg.421]    [Pg.430]    [Pg.144]    [Pg.190]    [Pg.131]    [Pg.165]    [Pg.381]    [Pg.381]    [Pg.134]    [Pg.140]    [Pg.163]    [Pg.274]    [Pg.212]    [Pg.107]    [Pg.72]    [Pg.143]    [Pg.456]    [Pg.456]    [Pg.459]    [Pg.137]    [Pg.48]    [Pg.115]    [Pg.16]    [Pg.18]    [Pg.24]    [Pg.30]    [Pg.560]    [Pg.746]    [Pg.205]    [Pg.516]   


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