L40 DIFFERENTIAL SCANNING CALORIMETRY

1. OML751 TESTING OF MATERIALS
M.KARTHIKEYAN
ASSISTANT PROFESSOR
DEPARTMENT OF MECHANICAL ENGINEERING
AAA COLLEGE OF ENGINEERING & TECHNOLOGY, SIVAKASI
karthikeyan@aaacet.ac.in

2. UNIT V OTHER TESTING
1. Thermal Testing: Differential scanning calorimetry,
2. Differential thermal analysis. Thermo-mechanical and
3. Dynamic mechanical analysis:
4. Chemical Testing: X-Ray Fluorescence
5. Inductively Coupled Plasma-Optical Emission Spectroscopy and
6. Inductively Coupled Plasma-Mass Spectrometry.

3. DIFFERENTIAL SCANNING CALORIMETRY (DSC)
 Differential Scanning Calorimetry (DSC) is a well established
measuring method which is used on a large scale in different
areas of research, development, and quality inspection and
testing.

4.  Differential scanning calorimetry (DSC) is a technique used to
investigate the response of polymers to heating.
 DSC can be used to study the melting of a crystalline polymer or
the glass transition.
 The DSC set-up is composed of a measurement chamber and a
computer.
 Two pans are heated in the measurement chamber.
 The sample pan contains the material being investigated.
 A second pan, which is typically empty, is used as a reference.
 The computer is used to monitor the temperature and regulate
the rate at which the temperature of the pans changes.
 A typical heating rate is around 10 ◦C/min.

5.  The rate of temperature change for a given amount of heat will
differ between the two pans.
 This difference depends on the composition of the pan contents
as well as physical changes such as phase changes.
 For the heat flux DSC used in this lab course, the system varies
the heat provided to one of the pans in order to keep the
temperature of both pans the same.
 The difference in heat output of the two heaters is recorded.
 The result is a plot of the difference in heat (q) versus
temperature (T).

6.  Differential Scanning Calorimetry (DSC) is a thermal analysis
technique in which the heat flow into or out of a sample is
measured as a function of temperature or time, while the
sample is exposed to a controlled temperature program.
 DSC analysis provides test data for a wide range of materials,
including polymers, plastics, composites, laminates, adhesives,
food, coatings, pharmaceuticals, organic materials, rubber,
petroleum, chemicals, explosives, biological samples and more.
 DSC also measures the rate of heat flow and compares
differences between the heat flow rate of the test sample and
known reference materials. The difference determines variations
in material composition, crystallinity and oxidation.

9. APPLICATIONS
It is a very powerful technique to evaluate material properties such
as
1. glass transition temperature,
2. melting,
3. crystallization,
4. specific heat capacity,
5. cure process,
6. purity,
7. oxidation behavior, and
8. thermal stability.

10. • Differential scanning calorimetry comes under the
category of ____________
Spectral analysis
Morphological analysis
Thermal analysis
Geological analysis
MCQ -1

11. • Differential scanning calorimetry is useful for
determining the ____________
Melting temperature, glass transition temperature, heat of
fusion etc
Volatilities of plasticizers and other additives
Quantitative determination of additives in polymers
Structural imperfections
MCQ -2

12. Differential scanning calorimetry is a technique to measure
_________.
electrical conductivity
specific heat
thermal expansion
magnetic field
MCQ -3

13. Differential scanning calorimetry (DSC) can be used to
determine which of the following properties of a
semicrystalline polymer sample?
The melting temperature
The crystallization temperature
The degree of crystallinity
All of the above
MCQ -4

14. For typical polymer samples, the melting temperature
will be which of the following relative to the
crystallization temperature?
The melting temperature will be less than the
crystallization temperature.
The melting temperature will be equal to the crystallization
temperature.
The melting temperature will be greater than the
crystallization temperature
MCQ -5