Thermal analysis is an analytical method to study the relationship between physical and chemical changes and temperature of materials. This article summarizes application of thermal analysis technology in research field of traditional Chinese medicine.
1. Introduction to Thermal Analysis
Thermal analysis (TA) is a technique that records the functional relationship between physical properties and temperature of sample under the programmed temperature conditions. The most commonly used TA methods are differential thermal analysis (DTA), differential scanning calorimetry (DSC) and thermogravimetry (TG). The most commonly used thermal analysis crucible consumables are alumina thermal analysis crucible , aluminum sample plate and platinum crucible.
Differential scanning calculation (DSC) is a technique that under temperature control program, used to determine the relationship between the heat flow rate or power difference of samples and reference materials, and temperature or time under program control temperature. DSC has been widely used in the fields of material processing, chemistry, medicine, biochemistry, petroleum, aerospace, environmental protection, etc. Thermal analysis is an important method used in physical property analysis in raw material analysis to analyze the mineral composition and chemical composition of raw materials.
Abstract: DSC, TGA and TMA techniques are used for systematical study of glass transition, thermal degradation, thermal oxygen degradation, HCl removal process and deformation characteristics of ABS / PVC / NBR alloys. The results show that various changes in ABS / PVC / NBR alloy are accompanied by changes in energy, mass and dimension. Glass transition temperature is an important parameter to characterize the compatibility of plastic alloys. Thermal stability of the alloy depends on HCl removal process of PVC in the alloy system. TMA curve of ABS/PVC/NBR is divided into flat section, expansion section and softening section, in expansion section products will deform and lose practical value. Flat section belongs to the application scope, and softening section provides technical data and theoretical basis for determining the optimal process.
