Study on the Thermal Properties of PBT Polyester Fiber by Differential Scanning Calorimeter

　　1. Introduction

　　Differential scanning calorimeterThe application is becoming increasingly widespread, and this test case is the application of differential scanning calorimetry in the fields of fiber and textile engineering. Polyester fiber is currently a widely used synthetic fiber, which is concentrated from organic dicarboxylic acids and binary systems and spun into synthetic fibers. At present, polyester fibers mainly include polybutylene terephthalate (PBT) and polybutylene terephthalate (PTT). By using a DSC differential scanning calorimeter, the thermal properties of polybutylene terephthalate (PBT) were tested. The heating rate was determined by studying the thermal performance changes of PBT at different heating rates, and the linear relationship between PET mass and enthalpy was studied. A quantitative analysis method for PBT material in DSC equipment was determined. At the same time, in-depth research on the composition, structure, and properties of textile materials is conducted through differential scanning calorimetry, providing important technical support for the development and application of textiles.

　　2、 Experimental operation　

　　2.1 Instruments and experimental conditions

Equipment: Differential Scanning Calorimeter DZ-DSC100A (Nanjing Dazhan Testing Instrument Co., Ltd.)

Gas: Nitrogen atmosphere with a flow rate of 50mL/min

Experimental conditions: Conduct tests at 5k/min, 10k/min, 20k/min, 30k/min, and 40k/min respectively. Raise the temperature to 300 ° C.

2.2 Testing situation　

The following figure shows the basic test results of PBT melting process under different heating rates. It can be seen that the higher the heating rate, the wider the peak of the DSC curve of PBT. We found that at a heating rate of 40k/min, the enthalpy of PBT decreased rapidly, so we chose a heating rate of 30k/min with better thermal effect and more complete separation.

2.3 Sample size selection

Due to the significant thermal effect of PBT under heating conditions, any sample size within the linear range can meet the testing requirements, generally 10-15mg.

　　3、 Conclusion

The thermal performance of PBT was studied and tested using differential scanning calorimetry, which determined a fast, simple, and convenient quantitative testing method for PBT. The test results met the requirements of FZ/T 01053-2007 "Identification of Fiber Content in Textiles" standard and can be used for quantitative detection of PBT textile products.