Application of Thermogravimetric Analysis in Measuring the Thermal Decomposition Temperature and Weight Loss Corresponding Temperature of Plastic Particles

Thermogravimetric analysis (TGA), as an important thermal analysis technique, is widely used in the study of thermal stability of materials. This article studies the thermal decomposition behavior of plastic particles through thermogravimetric analysis technology, explores the thermal decomposition temperature and weight loss corresponding temperature of plastic particles, and provides theoretical basis for the processing and application of plastic particles.

　1. Introduction　　

Plastic particles, as an indispensable basic material in modern industry, have a direct impact on the processing technology of the material and the performance of the final product due to their thermal stability. Thermogravimetric analysis technology can accurately measure the mass change of materials during heating, thereby determining the thermal decomposition temperature and weight loss corresponding temperature of materials, which is of great significance for evaluating and improving the thermal stability of plastic particles.

　　2、 Experimental section　

2.1 Materials and Instruments　

Plastic particle sample: Standard plastic particles.

Instrument: DZ-TGA101 Thermogravimetric Analyzer (TGA).

　　2.2 Experimental Methods　

2.2.1. Instrument: DZ-TGA101Thermogravimetric analyzer (TGA)Aluminum crucible tweezers

2.2.2 Gas: Nitrogen

2.2.3 Sample: Plastic particles

2.2.4. Main experimental parameters:　

Sample weight: 20 ± 3mg　

Gas flow rate: 50 ± 10ml　

Heating rate: 10 ° C/min

Cut off temperature: 300 ° C

After accurately weighing the plastic particle sample, place it in a TGA crucible. Set heating program, including heating rate, atmosphere (such as nitrogen or air), etc. Start the experiment as shown in the figure below and record the mass change of the sample with increasing temperature.

3、 Results and Discussion

3.1 Thermogravimetric Curve Analysis

Through TGA experiments, we obtained the thermogravimetric curves (TG curves) and microscale thermogravimetric curves (DTG curves) of plastic particles. The TG curve shows the mass loss of plastic particles during heating, while the DTG curve reflects the rate of mass loss.

3.2 Determination of Thermal Decomposition Temperature

Based on the TG curve, we can determine the initial decomposition temperature (Ti) of plastic particles, the temperature corresponding to the maximum weight loss rate (Tmax), and the final decomposition temperature (Tf). These temperature points are key parameters for evaluating the thermal stability of plastic particles.

3.3 Temperature analysis corresponding to weightlessness

Through analysis, we can identify the weight loss behavior of plastic particles at different temperatures. The temperature corresponding to weightlessness refers to the temperature at which the mass loss of plastic particles reaches a certain percentage at a specific temperature.

3.4 Discussion of influencing factors

The effects of heating rate, atmosphere, sample dosage, and particle size on TGA results were considered in the experiment. By optimizing the experimental conditions, we can obtain more accurate thermal decomposition temperature and weight loss corresponding temperature.

　　4. Conclusion　

Thermogravimetric analysis technology provides an effective method for studying the thermal stability of plastic particles. By measuring the thermal decomposition temperature and weight loss corresponding temperature of plastic particles, we can better understand the thermal behavior of materials and provide scientific basis for the processing and application of plastic particles.