TGA
Thermogravimetric Analysis
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TA Instruments TGA Q500 with Autosampler
TA Instruments TGA Q500 with Autosampler
TGA-Thermogravimetric Analysis This technique is a method of thermal analysis in which the mass of a sample is measured over time as the temperature changes. This technique provides information about physical phenomena, such as phase transitions, absorption, adsorption and desorption; as well as chemical phenomena including chemisorptions, thermal decomposition, and solid-gas reactions (e.g., oxidation or reduction).
Specifications and Requirements
Specifications and Requirements
Nitrogen Purge Gas
Nitrogen Purge Gas
Order Compressed Nitrogen Cylinder Airgas Part #:NI UHP300 https://www.airgas.com/p/NI%20UHP300
Air Purge Gas
Air Purge Gas
Order Compressed Air Cylinder Airgas Part #:AI UPC300 https://www.airgas.com/p/AI%20UPC300
TGA Q500 SPECIFICATIONS
TGA Q500 SPECIFICATIONS
The Q500 is the world’s best-selling, research-grade thermogravimetric analyzer. Its field-proven performance arises from a responsive low-mass furnace, ultrasensitive thermobalance, and efficient horizontal purge gas system with mass flow control. Its convenience, expandability and powerful, results-oriented software make the Q500 ideal for the multi-user laboratory where a wide variety of TGA applications are conducted, and where future expansion of analytical work is anticipated.
Temperature Compensated Thermobalance Included
Maximum Sample Weight 1 g
Weighing Precision +/- 0.01%
Sensitivity 0.1 µg
Baseline Dynamic Drift* < 50 µg
Furnace Heating Resistance Wound
Evolved Gas Analysis Furnace (EGA) Optional
Temperature Range Ambient to 1 000°C
Isothermal Temp Accuracy +/- 1°C
Isothermal Temp Precision +/- 0.1°C
Controlled Heating Rate 0.01 to 100°C/min
Furnace Cooling (forced air/N 2 ) 1000 to 50°C < 12 min
Temperature Calibration Curie Point
16 Position Autosampler Optional Hi-Res TGA™ Optional
Auto Stepwise TGA Included
Modulated TGA™ Optional
TGA/MS Operation Optional
TGA/FTIR Operation Optional
Platinum™ Software Included
Sample Pans
Platinum 50, 100 µL
Ceramic 100, 250, 500 µL
Aluminum 100 µL
Application Examples
Application Examples
Compositional Analysis
Compositional Analysis
TGA is used to determine sample composition by measuring the weight of each component as it volatilizes or decomposes under controlled conditions of temperature, time, and atmosphere. This figure shows quantitative differences in type, amount, and decomposition mechanism of the main polymers in three paint samples. More detailed examination of the profiles below 150°C may reveal further information on the amount and possible nature of the carrier solvent (aqueous or oil) used in each paint.
Effect of Additives
Effect of Additives
This figure compares the decomposition profiles of a polycarbonate material with and without an added flame retardant. The flame-retarded material consistently decomposed at a temperature about 20-25°C lower than that of the unmodified sample. The former material also lost a greater percentage of weight than the standard material (e.g., 48% vs. 28%) at a given temperature (e.g., 460°C) during the decomposition step. This indicates that flame-retardant additives accelerate the polycarbonate decomposition. The purpose of the retardant material is to inhibit flame propagation.
Verification of Thermal Events
Verification of Thermal Events
TGA is very useful in conjunction with other thermal analysis techniques such as DSC and is often critical to understanding the true nature of thermal events. In this data, a pharmaceutical material undergoes an endothermic transition above 125°C which was previously thought to be melting. TGA analysis demonstrates considerable weight loss below 125°C, which suggests that the endotherm is actually decomposition. DSC analysis at multiple rates exposes rate-dependence of this transition which confirms decomposition.
Quantification of Filler Content
Quantification of Filler Content
TGA is a sensitive technique for analyzing and quantifying the filler content of polymeric composites. This figure contains a comparison of the TGA results for a virgin and filled PET sample. The virgin material is first analyzed for comparison. By quantifying the weight loss of the initial lower-temperature decomposition, and comparing it to the oxidative decomposition in the second weight loss, the filler content of the composite material is accurately quantified.
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