There are two melting peaks on dsc curve. How to calculate crystallinity?

It is one of the most widely used thermal analysis techniques. In practical application, the mechanical properties of plastics and rubber materials are related to their thermal properties, such as glass transition temperature (Tg), melting temperature (Tm), crystallization temperature (Tc), specific heat (Cp) and enthalpy. Oxidation induction period test (O.I.T) can give information about the oxidation behavior of materials and the influence of additives. High pressure DSC can further show the influence of pressure on oxidation reaction, crosslinking reaction and crystallization behavior. The shape of melting peak on DSC curve can give the information of particle size distribution, and the melting enthalpy can give the information of crystallinity. Many semi-crystalline thermoplastic materials have an exothermic cold crystallization peak in the application temperature range before the melting temperature, and the shrinkage caused by it will affect the use of materials. The influence of impurities and humidity can also be obtained by DSC. The effects of crystallization temperature, crystallization rate, nucleating agent and recycled materials can be obtained in programmed cooling. The second heating curve can give the influence of material processing technology and preparation conditions. Fourier transform infrared spectroscopy (FTIR) test: FTIR technology can be used to detect various chemical molecules, and it has high resolution for different kinds of chemicals that appear at the same time. Thermogravimetric analyzer (TGA) Thermogravimetric analysis: Put the sample at the temperature controlled by the program, and observe the function of sample quality with temperature or time. Widely used in research and development, process optimization and quality control of plastics, rubber, coatings, medicine, catalysts, inorganic materials, metal materials and composite materials.