What you need to know to use a differential calorimeter

A differential calorimeter is a technique for measuring the temperature dependence of the power difference between a material and a reference at program temperature. When the temperature difference between the sample and the reference occurs during heating due to thermal effects, the current flowing into the compensated heating is changed by a differential thermal amplifier circuit and a differential thermal compensation amplifier, which immediately increases the current on the sample side.

Main research purposes: qualitative and quantitative data analysis of polymer composites, melting point, glass transition technology temperature, crystallinity, melting heat and crystallization heat, purity, reaction system dynamics, specific heat, phase transition operating temperature, compatibility.

What you need to know to use a differential calorimeter

To use a differential calorimeter, you need to know:

1, in order to ensure the normal use of the instrument, the sample can not occur thermal decomposition within the test temperature range, and does not react with metal aluminum, no corrosion. If the sample to be measured can produce a large amount of gas during the heating process, or can cause an explosion, can not use the instrument. Therefore, you should have a general understanding of the properties of the sample before testing.

2. Check whether all the connections of the instrument are correct, whether the gas used is sufficient, and whether the tools are complete.

3. In the test, if the aluminum crucible is selected as the sample dish, the maximum temperature of the test shall not exceed 550℃. If the temperature in the experiment exceeds 550℃, ceramic crucible can be used.

4, in order to ensure the accuracy of the test results, the use of the instrument first air burning (without any sample and reference) for about 30 minutes.

5, the sample dosage should be appropriate, not too much, not too little. Solid samples are generally about 20mg. The liquid sample should not exceed two-thirds of the crucible capacity. If the sample dosage is otherwise required, determine the dosage according to the requirements.

6, for inorganic samples can be ground in advance, sifting; The polymer sample should be as uniform as possible; The fibers can be made to the same length of 1~2mm; The powder sample should be compacted.