Measurement of Glass Transition Temperature of Resin Materials by Differential Scanning Calorimeter (DSC)

The performance and stability of chemical products are crucial for their application. Differential Scanning Calorimetry (DSC), as a thermal analysis technique, can provide information on the heat flux changes of substances during heating or cooling, thereby helping researchers understand the thermal properties of substances, such as melting point, crystallinity, glass transition temperature, thermal stability, etc. These pieces of information are of great significance for the synthesis, processing, and application of materials.

　　Differential scanning calorimeterWork by measuring the energy difference caused by temperature changes during heating or cooling of the sample and reference material. When a sample undergoes physical or chemical changes, it absorbs or releases heat, resulting in a temperature difference between the sample and the reference material. The differential scanning calorimeter system records this temperature difference and converts it into a heat flow signal to obtain the thermal properties of the sample.

　1、 Testing method　

1. Testing instruments

Instrument model: DZ-DSC300 differential scanning calorimeter

Instrument brand:Nanjing DaZhan Testing Instrument

2. Sample preparation

Before conducting DSC testing, it is necessary to prepare an appropriate amount of resin sample. The sample should be uniform, dry, and avoid contact with moisture or other pollutants in the air.

3. Test steps

3.1 Place the sample and reference substance separately in the sample chamber and reference chamber of the DSC instrument.

3.2. Set the test temperature range from room temperature to 200 ℃ and the heating rate to 10 ℃/min.

3.3. Start testing, the DSC system automatically records the heat flux difference between the sample and the reference material.

3.4 Analyze the DSC curve to obtain the required thermal property information.

　　Application of Differential Scanning Calorimeter in Chemical Product Testing

1. Thermal stability test

Thermal stability is one of the important performance indicators of chemical products. Through DSC testing, it is possible to determine whether a substance undergoes decomposition, oxidation, or other chemical reactions during the heating process, as well as the starting temperature and thermal effects of these reactions. This is crucial for evaluating the application performance and safety of materials at high temperatures.

2. Phase transition and melting point determination

DSC can be used to determine the phase transition characteristics of substances, such as melting point, crystallinity, and glass transition temperature. These pieces of information are of great significance for understanding the physical state and processing performance of materials. For example, the glass transition temperature of polymer materials can affect their mechanical properties and processing conditions.

Differential Scanning Calorimeter (DSC), as a powerful thermal analysis tool, has a wide range of applications in chemical testing. Through DSC testing, the thermal properties, thermal stability, phase transition characteristics, and reaction kinetics of substances can be obtained, providing important theoretical and practical guidance for the synthesis, processing, and application of materials.