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Universal Extensional Fixture and Sentmanat Extension Rheometer:
UXF & SER

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  • For extensional rheology investigations
  • Strain- or stress-controlled extensional and DMA tests with the UXF
  • Extensional tests at high torques with the Sentmanat Extension Rheometer
UXF & SER

The Universal Extensional Fixture (UXF) and the Sentmanat Extension Rheometer (SER) turn the MCR rheometers into platforms for extensional rheology investigations. The systems allow extensional measurements to be performed on filled and unfilled polymers, melts, adhesives, and food systems over a large temperature and deformation range. Extensional measurements provide information about molecular structure, branching, temperature stability, shrinkage, relaxations, and brittleness, as well as the adhesion and peel strength of films and fibers.

Key features

Universal Extensional Fixture

The Universal Extensional Fixture (UXF) is a combined measuring system with one rotatable drum connected to the EC drive via the shaft and a second stationary drum mounted to a fixed lower shaft. Special fixtures and various drum designs ensure excellent grip between the specimen and the drums when performing strain- or stress-controlled extensional tests. Additionally, in combination with a convection temperature device, the UXF enables tensile strain- or stress-controlled DMA tests across a wide temperature range. Optionally, the UXF can be used for measurements in immersion.

Universal Extensional Fixture for a configuration with two EC drives

The Universal Extensional Fixture for a configuration with two EC drives (UXF/TD, US Patent 9,766,172) consists of two drums driven by the two drives in counter-rotation mode. The first drum in the center is directly connected via the shaft to the upper EC drive, while the lower drive rotates a second eccentrically mounted drum over an intermeshing gear system. This setup enables extensional rheological measurements with unprecedented torque and strain resolution for low-viscosity films and fibers. The fixture also permits extensional tests up to previously unachieved elongations with Hencky strains larger than eight, enabling more comprehensive characterization of strain hardening.

Sentmanat Extension Rheometer

The Sentmanat Extension Rheometer (SER 3) extensional rheology system consists of two counter-rotating drums with intermeshing gears and low-friction bearings. The rotational movement of the rheometer is directly transferred to both drums, which stretch the sample uniformly over the entire stretching area to ensure reliable results. Due to its design, SER 3 is perfect for extensional tests at high torques. Various drum surfaces guarantee measurements without slippage. The system can also be immersed to prevent sagging.

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