Thermal analysis method for determining content of each phase state ingredient of half crystallization high molecular material

Abstract

The invention provides a thermal analysis method for determining the content of each phase state ingredient of a half crystallization high molecular material. According to the method, conventional and step type temperature rise modes are respectively used for heating a sample; a StepScan DSC curve is resolved into a reversible specific heat capacity curve and an irreversible specific heat capacity curve; the glass transition position is determined through the discontinuous mutation of the specific heat capacity on the reversible specific heat capacity curve; then, the content of different phase state ingredients of half crystallization molecules is determined according to the specific heat capacity increase and the melting enthalpy on the DSC curve. Through an SSDSC technology, the glass transition is separated out from a dynamic process to obtain the parameters such as the reversible specific heat capacity, the glass transition temperature and the melting enthalpy in the test sample temperature rise process; the glass transition temperature of the half crystallization high molecular material can be obtained; the reversible specific heat capacity corresponding to different temperatures can be accurately obtained; meanwhile, the content of different phase states such as the crystallization state, the flowing amorphous state and the hard amorphous state in the half crystallization high molecular test sample can be calculated according to the specific heat capacity and the melting enthalpy.

Description

technical field [0001] The invention relates to a semi-crystalline polymer material, in particular to a method for measuring the content of each phase component of the semi-crystalline polymer material. Background technique [0002] According to the regularity of molecular spatial arrangement, polymer materials can be divided into crystalline polymers and amorphous polymers. Generally speaking, when most crystalline polymer materials are stacked into crystals, the ends of the chains and entanglement points will be excluded from the crystal region, so the entire molecular chains can only be partially crystallized, and the formed crystals are not perfect. , which forms a semi-crystalline polymer. Glass transition is a common phenomenon of semi-crystalline polymers. It is the transition of amorphous molecules between the glass state and the high elastic state in the temperature field. It can reflect the motion state of polymer material segments and other structures. [0003] ...

AI Technical Summary

Problems solved by technology

In the research and testing of semi-crystalline polymer materials, SSDSC technology is used to study the reversible and irreversible changes of materials, and there is no further research on the phase component content (crystalline state and amorphous state, etc.) of materials.

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