Is DSC required to obtain a DIN

Dynamic difference calorimetry

What is Dynamic Difference Calorimetry?

The dynamic difference calorimetry (deu. DDK, engl. DSC) is one of the most important techniques of thermal analysis. The DSC analysis recorded endothermic and exothermic transitions such as the determination of transition temperatures and enthalpy of solids and liquids as a function of temperature.

In contrast to classic calorimetry, in which a sample is placed in an isolated chamber in order to monitor its heat absorption and release in an isothermal experiment, dynamic difference calorimetry is a dynamic process.

A typical calorimeter is an isolated chamber in which a sample is placed in a surrounding medium. Then the sample is heated with a certain amount of heat. The temperature difference between the sample and the surrounding medium provides the sample's heat capacity and information about the sample's heat dissipation and consumption. In addition, dynamic difference calorimetry uses a sample and a reference that are exposed to the same conditions, and their signal is directly subtracted from each other.

Where is dynamic difference calorimetry used?

DSC analysis is used for many applications in a wide range of industries such as polymer characterization as well as for basic research in academia. Examples are the determination of the glass transition and the Investigation of chemical reactions, melting and crystallization behavior.

Other DSC applications deal with the influence of additives, fillers or the processing of materials. The characteristic shape of the individual DSC curves is also used for quality control applications.

What is the difference between a DTA and a DSC?

The difference between DSC and DTA is: DSC measures the difference in heat flow and DTA measures the temperature difference between a reference sample and a sample of interest.

What is the difference between the heat flow principle (Heat Flux DSC) and the power compensation principle (Power compensated DSC)?

DSC devices are built according to two basic measuring principles: the heat flow principle and the power compensation principle. Both variants are known in science under the English terms Heat-Flux-DSC and Power-compensated-DSC.

In the Heat flux DSC the changes in the heat flow are calculated by integrating the ΔTref curve. For this type of DSC analysis, a sample and a reference crucible are placed on a sample holder with integrated temperature sensors to measure the temperature of the crucibles. This arrangement is in a temperature controlled oven. In contrast to the classic design, the characteristic feature of this DSC is the vertical arrangement of flat temperature sensors that surround a flat heater. This arrangement enables a very compact, lightweight and low-heat capacity structure with the full functionality of a DSC oven.

In the power-compensated DSC analysis sample and reference crucible are spatially separated. Then the temperature of both chambers is regulated so that the same temperature is always present on both sides. The electrical power required to achieve and maintain this condition is then recorded instead of the temperature difference between the two crucibles.

Dynamic Difference Calorimetry Standards?

  • DIN 53765: Testing of plastics and elastomers; Thermal analysis; Dynamic differential calorimetry (DDK)
  • DIN 51007: 2019-04: Thermal analysis (TA) - differential thermal analysis (DTA) and dynamic differential calorimetry (DSC) - general principles
  • DIN EN 6041: 2018-03: Aerospace series - Non-metallic materials - Test methods - Analysis of non-metallic materials (unhardened) using dynamic differential calorimetry (DSC); German and English version EN 6041: 2018
  • DIN EN 728: Plastic piping and protective pipe systems - Pipes and fittings made of polyolefins - Determination of the oxidation induction time; German version EN 728: 1997
  • DIN EN ISO 11357-1, -2, -3, -4 and -6: Plastics - Dynamic differential thermal analysis (DSC) - Part 1: General principles (ISO 11357-1: 2016); German version EN ISO 11357-1: 2016
  • ASTM E 126: Standard Test Method for Inspection, Calibration, and Verification of ASTM Hydrometers
  • ASTM E 1356: Standard Test Method for Assignment of the Glass Transition Temperatures by Differential Scanning Calorimetry