Transcript Chemical and Thermal Analysis

LABORATORIUM MIPA TERPADU FMIPA UNS
Thermal Analysis
Thermal Analysis
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Differential Scanning Calorimetry (DSC)
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Thermogravimetric Analysis (TGA)
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Diferential Thermal Analysis (DTA)
Basic Principle
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Sample is heated at a constant heating
rate
Sample’s Property Measured
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Wt
Heat Flow
Temp
TGA
DSC
DTA
Thermal Analysis
Thermogravimetric Analysis (TGA)
TGA measures the weight of a substance heated at a
controlled rate as a function of temperature or time.
All materials ultimately decompose on heating, and the
decomposition temperature and profile is a characteristic
property of each material.
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Main use of TGA: Inorganic Content of Material
Thermal Analysis
Thermogravimetric Analysis (TGA)
Other uses of TGA:
Material Thermal Stability.
Moisture and Volatiles Content (TG-IR).
Composition of Multi-Component Systems.
Shelf-Life Studies and Decomposition Kinetics.
Thermal Analysis
Thermogravimetric Analysis (TGA)
% Polymer
= 64.4%
% Carbon Black = 3.4%
% Glass Fibre
= 32.2%
TGA
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Constant Heating
Rate
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Data
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Initial Temp
Final Temp
Heating Rate (°C/min)
Weight vs Time
Weight vs Temp.
Differential This Data
(DTG)
TGA – Ca(C204)*xH2O
DTA
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Sample and Reference Placed in Heater
Constant Heating Rate
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Data
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Initial Temp
Final Temp
Heating Rate (°C/min)
Temp of Sample vs Time (or Temp)
Temp of Reference vs Time (or Temp)
Reference should be inert, e.g. nothing but latent heat
Measures
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Heat of crystallization
Glass Transition Temperature
DTA + DTG
Thermal Analysis
Differential Scanning Calorimetry (DSC)
DSC is a thermal method of analysis to study the thermal
behaviour and thermal properties of materials (typically
polymers). The material is sealed in a sample pan and
subjected to a controlled temperature programme.
The resulting thermograph can yield much valuable
information about the properties of the material analysed.
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Main use of DSC: Material Identification (Tm and DHf)
based on IS EN ISO 3146:2000; Method C2
Thermal Analysis
Differential Scanning Calorimetry (DSC)
DSC
DSC
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Constant Heating Rate
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Data
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Initial Temp
Final Temp
Heating Rate (°C/min)
Heat flow to sample minus
Heat flow to reference vs
Time (Temp.)
Measures heat of
crystallization
Polymer without weight change in this temperature range
Thermal Analysis
Differential Scanning Calorimetry (DSC)
Other uses of DSC:
% Crystallinity determination by DSC (based on IS EN ISO
3146:2000; Method C2).
Purity and Polymorphism analysis by DSC.
Thermal Stability of materials (e.g. – oxidative induction
time (OiT) of materials) by DSC.
Thermal Analysis
Differential Scanning Calorimetry (DSC)
Contact Details :
Laboratorium MIPA Terpadu FMIPA UNS
Jln Ir. Sutami 36A Kentingan Surakarta
Phone/Fax 0271 663375
Cq.
Dr. Sayekti Wahyuningsih, M.Si
Edi Pramono, M.Si