Simultaneous Thermal Analysis (STA)

Simultaneous Thermal Analysis (STA) generally refers to the simultaneous application of Thermogravimetry (TGA) and Differential Scanning Calorimetry (DSC) to one and the same sample in a single instrument. The advantages are obvious: The test conditions are perfectly identical for the TGA and DSC signals (same atmosphere, gas flow rate, vapor pressure on the sample, heating rate, thermal contact to the sample crucible and sensor, radiation effect, etc.). Furthermore, sample throughput Is improved as more information can be gathered from each test run.

Measurement Results by STA

TGA Possibilities

  • Mass changes
  • Temperature stability
  • Oxidation/reduction behavior
  • Decomposition
  • Corrosion studies
  • Compositional analysis
  • Thermokinetics

Application Example

Plastics: PET

Plastic bottles, textile fibers and films (for example, packaging for food) are well known applications of the polymer PET (polyethylene terephthalate). This STA measure-ment under nitrogen exhibits a step in the DSC signal below 100°C which is due to the glass transition. A corresponding increase in specific heat of 0.35 J/(g·K) was detected. The endothermic DSC peak at 81°C is due to relaxation, the exothermic peak at 131°C is due to crystallization and the endothermic peak at 255°C is due to melting. At temperatures above 360°C, the pyrolytic decomposition of the sample occurred with a total mass loss of 79.5%.

The SiC furnace was used for the investigation of the thermal behavior of a PET sample (10.13 mg) in a nitrogen atmosphere. The heating rate amounted to 10 K/min.

Method Related Products

STA 449 F1 Jupiter®

With the STA 449 F1 Jupiter® NETZSCH is setting new standards. Unlimited configuration flexibility and unmatched performance are the foundations for a great variety of application possibilities in the fields of ceramics, metals, plastics, and composites over a broad temperature range (-150°C ... 2400°C).

STA 449 F3 Jupiter®

The STA 449 F3 Jupiter® combines the advantages of a high sensitive thermobalance and a true Differential Scanning Calorimeter. Various furnaces and TG, TGA-DTA and TGA-DSC sensors can be used, whereby the system can be easily optimized for the most versatile applications.

STA 449 F5 Jupiter®

The STA 449 F5 Jupiter® is a truly sophisticated instrument with two true measurement techniques (DSC and TGA), easily expandable capabilities, accessories for evolved gas analysis and a complete software package all for a very attractive price.

 

STA 2500 Regulus

The STA 2500 Regulus is a highly reliable and fully equipped top-loading differential balance ideal for standard STA measurements with frequently changing temperature programs available at an excellent price.