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Erweiterung der Ausstattung / New Equipment

Wir bemühen uns, unsere Charakterisierungs- und Synthesemethoden stets auf aktuellem Stand zu halten. Diese Liste zeigt die neuesten Geräte und gibt eine kurze Beschreibung.
We always try to keep our complete equipment up to date. This list shows the new equipments and offers a short description.

TA-Instruments ARES G2 (2nd instrument in the group) [start of operation Sept 2017]

Rheology is one of the basics methods for the research fields of our group. This second modell of the HighEnd-Rheometer of the latest generation offers new measurement capacities that are needed in our group due to the expansion of the group and due to the new combination Rheo-NMR requiring long measurement times.

The Complete System is from TA-Instruments, with sample geometries for liquids and melts, oven with digital monitoring of sample, temperature range between -70 °C and 400 °C. The sensitivity of the new rheometer covers an extremely high range starting from 0.05 µN/m to 200 mN/m offering a factor of 8 for low torque measurements and a factor of 2 for high torques compared to the old ARES.  Therefore, it offers the possibility to measure low-viscosity liquids as water as well as special polymers with high stiffness.

SEC-NMR (SEC from PSS,  NMR: Magritek Spinsolve 60 start of operation July 2017]

GPC-NMRWith this new combination we want to achieve chemical information combined with simultaneously recovered size information and separation. The result is a 2D-diagram chemical shift against elution volume.

This characterization method allows to analyze blends or copolymers not only for their average composition. It delivers the full composition as a function of the size of the molecule. For further information please see the page in the research areas "Low-field-NMR and SEC"

Keyence Digital microscope VHX 900F [start of operation June 2017]

The microscope delivers pictures of surfaces (incident light microscope) with µm-resolution and an impressiv depth of field due to features as automatic focus stacking. Enlargement rand reaching from 1:1 up to 2000:1. It's the perfect complement to our Zeiss transmission microscope.

The microscope will be used in projects like foaming of model polymers or nanoparticle-hydrogels where the optical impression is needed to judge the success of a synthetic approach.

Haake Minijet Pro [start of operation march 2017]

The Haake Minijet Pro is a injection molding machine for lab scale, starting from sample amounts as low as 2 ml. Our system is equipped with several geometries, including specimens according DIN regulations and simple platets for rheological experiments. In combination with the Haake MiniLab, an extruder in lab scale (see left side of picture), we can produce also composites or blends.

Therefore, this new equipment offers the possibility for test specimens even for small amounts available, e.g. for our self-synthesized model polymers.

Capillary rheometer Göttfert Rheograph 50 [start of operation oct 2016]

This new capillary rheometer is a big improvement compared to the existing older model from the same company.

With this system, one can examine extremely high shear rates up to 6 Mill s^-1. This is enough to simulate conditions in polymer processing as well as for lubricants in mechanic engines.

In addition, this rheometer can cool and heat, so one can measure food, e.g. chocolate at realistic conditions.

Also PVT-Measurements can be performed. The relation between pressure, volume and temperature is an established method for measuring material compressibility under processing conditions, an information necessary for the optimization of cylce times in polymer processing, especially in injection moulding.

Magritek Spinsolve 60 MHZ NMR spectrometer [start of operation oct 2016]

The Magritek Spinsolve 60 NMR spectrometer sets a new standard for 60MHz benchtop NMR
instruments. The Spinsolve 60 spectrometer provides high quality 1H NMR spectra in seconds and is based on permanent magnets, therefore no liquid nitrogen or helium is needed for the operation.

The main idea for this spectrometer is the usage in combination with GPC as the Magritec is also able to measure samples in flow. With this combination, we plan to build up a two dimensional charaterisation GPC-NMR, with size resolution due to the GPC and chemical information due to the NMR.

Cooling Unit for Anionic Synthesis [Start of operation october 2015]

This new equipment on the anionic schlenk line allows synthesis at temperatures down to -70°C without the use of liquid nitrogen.

Therefore, extremely long synthesis duration are possible as there is no danger of lack of nitrogen. In addition, the temperature can be controlled more exactly, more defined synthesis conditions lead to better defined polymers.

Hygromator, Add-on DMTA [Start of operation Jan 2015]

The Hygromator allows measurement of mechanical properties under defined humidity. This is absolutly necessary for our research on hydrogels. Here we try to optimize mechanical properties for hydrogels to use them later on for water desalination. As the mechanical properties are drastically dependend on the swelling degree, drying of the hydrogels has to be avoided to receive reliable measurements.

Texas Instruments DHR1 [start of operation june 2014]

Similar system to the already existing DHR3: Also the DHR1 is extremely sensitive in terms of measurable torque due to its magnetic bearings. Minimum torque is 0.1 nNm, measurements of liquids are therefore no problem for this machine.

With this equipment, the practical course has now actual modern equipment also for rheology.