The principle of the calorimeter is actually a
differential scanning calorimetry: Differential scanning calorimetry (DSC) is a technique for measuring the relationship between the power difference and the temperature of the lost substance and the reference at the programmed temperature. DSC and DTA instruments are similar, except that two sets of compensating heating wires are provided under the sample and reference vessel. When the sample is heated due to a thermal difference between the thermal effect and the reference during heating, Thermal amplifier circuit and differential heat compensation amplifier, so that the current flowing into the compensation electric heating wire changes, when the sample heat, the compensation amplifier so that the current side of the sample immediately increased; the other hand, when the sample exotherm Than the side of the current increases, until the heat balance on both sides, the temperature difference disappeared. In other words, the heat changes in the thermal reaction of the sample, due to the timely input of electrical power and compensation, so the actual record is the sample and the reference of the following two heat compensation heat power difference with time t relationship The If the heating rate is constant, the difference between the measured thermal power and the temperature T is recorded.
The main purpose:
The temperature, crystallinity, melting heat, crystallization heat, purity, reaction kinetics, specific heat, phase transition temperature and compatibility are studied in this paper. It is widely used in plastics, rubber, Paint, adhesives, medicine, petrochemical and other different areas.
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