Simultaneous TGA-DSC Analyzer for Polymer Analysis

What is the Simultaneous TGA-DSC Analyzer for Polymer Analysis?

A simultaneous TGA-DSC analyzer records mass change and heat flow from one polymer sample in a single run, so endotherms and exotherms can be classified as mass-changing or mass-neutral. It suits studies where melting, curing and decomposition overlap.

Overview

The instrument combines a thermobalance with a heat-flux calorimetric sensor under the same sample holder, so the two signals share one temperature programme and one atmosphere history. A melting endotherm with no mass change, a curing exotherm with no mass change and a decomposition endotherm accompanied by mass loss can therefore be separated in a single experiment, which is valuable for compounds containing both thermoplastic and thermoset phases. Balance resolution is usually 0.1 to 1 µg and calorimetric accuracy a few percent, which is adequate for step identification though less precise than a dedicated DSC. Typical crucibles are alumina or platinum with lids, and programmes often include a staged nitrogen-oxygen atmosphere to combine composition analysis with thermal event detection.

How does it work?

A thermogravimetric analyzer suspends the sample from a sensitive balance inside a furnace whose temperature is programmed. The balance continuously records mass, and the derivative curve shows the rate of change, which makes overlapping steps easier to resolve. Atmosphere, heating rate, purge flow and crucible type determine the temperature at which a step occurs, so standards fix these conditions. In an inert atmosphere the polymer matrix decomposes and leaves a residue of filler, ash or carbon black; switching to air or oxygen then burns off the carbon and leaves the inorganic ash. A TGA can also be coupled to an infrared spectrometer or a mass spectrometer through a heated transfer line, so the gases released at each step are identified, which turns a mass-loss curve into evidence about the chemical structure of the sample.

What are the key features?

• Simultaneous mass and heat-flow signals
• Single temperature programme for both signals
• Classifies endotherms with or without mass change
• Staged inert to oxidative atmosphere
• Balance resolution from 0.1 µg
• Crucibles with lids to limit volatile loss

What are the technical specifications?

A typical simultaneous tga-dsc analyzer for polymer analysis configuration offers temperature range of Ambient to 1100 °C, heating rate of 0.1–50 °C/min, balance resolution of 0.1 µg, calorimetric accuracy of ±5% (indium), typical sample mass of 5–20 mg and atmosphere control of Nitrogen, air, oxygen, switchable. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Simultaneous TGA-DSC Analyzer for Polymer Analysis is used in thermoset cure with volatile release, blends of thermoplastic and thermoset phases, decomposition overlapping a melting range and filler and heat-event analysis in one run. Across the wider TGA class, laboratories also deploy it for thermal stability ranking of polymer grades, filler, glass fibre and ash content determination and carbon black content in crosslinked compounds.

Which standards and certifications apply?

Relevant standards and methods include ISO 11358-1, ISO 11358-2, ASTM E1131, ASTM E2550, ASTM D6370 and IEC 61010-1. Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Calibrate the balance with certified masses and verify the temperature scale with a Curie-point or melting-point standard, since a temperature offset shifts every step. Use a purge flow high enough to remove volatiles but stable enough not to disturb the balance, and buoyancy-corrected blank runs for accurate small mass changes. Crucibles must be matched to the sample: platinum for oxidative work, alumina for most polymer programmes, and open crucibles for combustion steps. Crucibles must be cleaned or replaced because residue from a previous run adds mass. Finally, record heating rate, atmosphere and sample mass with every result, since the same polymer can give quite different decomposition temperatures under other conditions.

How do I select the right Simultaneous TGA-DSC Analyzer for Polymer Analysis?

Select a simultaneous instrument when a heat-flow curve alone leaves ambiguity, or when sample quantity is limited and both mass and heat information are needed from one run. Confirm the calorimetric accuracy you can accept, since coupled instruments are less precise than dedicated DSC, and check that the crucible set suits both the sample and the maximum temperature of your programme.

How does it compare with other TGA variants?

First define the question. For thermal stability ranking, a standard thermobalance with inert and oxidative gas switching is enough. For filler and carbon black content in filled compounds, choose an instrument with a wide temperature range, precise balance and a staged atmosphere programme, and add an autosampler if many samples are run. When the identity of evolved products matters, for example in failure analysis or in verifying flame-retardant mechanisms, select a coupled TGA-FTIR or TGA-MS system, noting that coupling reduces sample throughput and requires a heated interface. For composites that contain glass, mineral or ceramic fillers, confirm the furnace reaches the temperature needed to fully burn off the matrix.