Differential scanning calorimeterQuantitatively analyze the thermodynamic properties of materials by measuring the difference in heat flux between the sample and the reference material during the programmed temperature control process. canMeasure the glass transition temperature, melting point, and crystallinity of polymers, and analyze the phase transition temperature of metals. Detect the oxidation induction period of oils and analyze the gelatinization temperature of starch. Study the enthalpy change and activation energy of chemical reactions, analyze thermal decomposition characteristics, etc.

Differential scanning calorimeterKey points of operation:

1. Sample preparation:

Ensure that the sample is pure, dry, and free from contamination. Solid samples need to be ground to a uniform powder, while liquid samples need to have their viscosity controlled.

Accurately weigh the sample mass and record it to four decimal places.

2. Instrument calibration:

Preheat the instrument to a stable state and perform temperature and calorimeter calibration using standard samples.

Check if the gas flow rate and pressure meet the testing requirements.

3. Parameter settings:

Select the heating rate, high temperature (covering the thermal transition range), and holding time based on the properties of the sample.

Choose the appropriate atmosphere.

4. Data interpretation:

Peak recognition: The endothermic peak (downward) corresponds to processes such as melting and glass transition, while the exothermic peak (upward) corresponds to crystallization, oxidation reactions, etc.

Parameter calculation: Calculate the enthalpy change (Δ H) through peak area, and the peak temperature corresponds to the phase transition temperature.