Optical Accessory for MCR:
Rheometer-Infrared Spectrometer Adapter

MCR rheometer plus IR spectrometer – reach the molecular level

Perform real-time in situ observations of chemical and mechanical (rheological) changes with the rheometer-infrared spectrometer setup. To observe intramolecular vibrations or rotations caused by interacting molecules which are electromagnetically irradiated, the MCR rheometer can be combined with both mid-infrared (MIR) and near-infrared (NIR) light ranges. By placing an ATR (attenuated total reflection) crystal directly in the sample, MIR spectroscopy provides information about surface layer properties. Optionally, homogeneous UV radiation can be used simultaneously, providing a powerful tool for the investigation of photopolymerization reactions (e.g., of adhesives).

Vast variety of test types and temperature settings

The setup includes the well-established and actively controlled Peltier hood, the universal optical device, and a Peltier temperature-controlled device with easily exchangeable lower glass plates. Together, they ensure quick and accurate temperature control from -20 °C to +200 °C. The combination also supports purging with inert gas to avoid undesired chemical reactions like oxidation or degradation and to reduce atmospheric water signal in the IR spectrum. Alternatively, electrical temperature control is available from ambient temperature up to 300 °C, as well as disposable measuring geometries in various diameters (e.g., for samples that cannot be removed after curing).

The IR spectrometer of your choice

The MCR rheometer series can be combined with various FT-IR spectrometers and probes on the market, most of which can be triggered and controlled by the rheometer software. This enables automation and control, even for complex measuring definitions. With our expertise in both rheology and spectroscopy, we develop and support customized solutions for the integration of your IR spectrometer. While the RheoCompass rheometer software provides access to predefined measuring templates, IR spectra are stored, handled, and evaluated using the software and tools of the respective IR spectrometer.

RheoOptics Toolbox – modular and easy to use

The IR spectroscopy option includes a set of structure analysis accessories and the modular RheoOptic Toolbox for the MCR rheometer series. Due to its modular design, the MCR rheometer can be used in combination with the Polarized Light Imaging Option and other optical accessories, with fast switching in minutes. Peltier and electrical temperature devices can be used with other rheo-optic tools – such as Raman spectroscopy, polarized imaging, (fluorescence) light microscopy, small-angle light scattering (SALS), and UV curing – enabling efficient use of your measuring equipment. Additional structure analysis accessories include particle imaging velocimetry (PIV) and the dielectro-rheological device (DRD). Well-known features of the MCR rheometer series, including Toolmaster and QuickConnect, are also part of the package.

Simulate real-life conditions of different materials while investigating their behavior

The Rheometer-IR-spectrometer setup opens up opportunities for measuring mechanical and chemical sample properties simultaneously. It provides a deeper understanding of changes in the chemical functionality and microstructure of various materials and their influence on processing and applications. Raman spectroscopy and dielectric spectroscopy can also be considered complementary techniques.

Typical applications:

• Chemical reactions (e.g., UV-initiated curing of adhesives or coatings)
• Polymerizations in general
• Morphology of polymers
• Temperature behavior and stability of suspensions
• Structural parameters of biological and food samples (e.g., biofilms, cell cultures, and proteins)