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Rheology

M.A.S… provides worldwide services to customers from the chemical, pharmaceutical and automobile and food industries. We specialize in the computation, evaluation and interpretation of the rheological and morphological characteristics of their respective materials.



Instruments

Our laboratory is equipped with the most modern rheometers from these companies:

  • Rheometric scientific (now TA instruments, ARES)
  • Thermoelektron Co. (HAAKE MARS)
  • Paar Physika (MRC)
  • Amongst others

The analyses are performed under shearing (plate-plate-, cone-plate- and coquette-geometry) and stretching (different stretch additions with ARES and MRC instruments). All rheometers are regularly serviced to check the temperature and compliance.


Rheological measurement

The materials examined can be either low viscosity solutions (polymer solutions, mineral oil, foodstuffs, varnish and colors as well as dispersions) or highly-viscous melts, polymer mixtures and filled polymers, as well as, nanocomposites.

Rheological tests: stationary shear flow, oscillatory shear at low (SAOS) and high amplitudes (LAOS), stretch flows, rheological test under the influence of electric (electro-) and magnetic fields (magnetorheology).

Time-resolved analyses of the following transient processes: solid-liquid transitions, crystallization processes, chemical and physical networking processes, thermally stimulated order-disordering phenomena, separation processes and stability analyses.

Special tests include: computation of molecular weight distribution, detection of long chain branching in polymer melts, crystallization and gelling kinetics, determination of percolation thresholds and dispersion status of particles in filled materials.


Data analysis

You can either send us your data, or we can carry out the research and the respective data analysis for you:

  • Time-temperature superposition (TTS)
  • Van Gurp-Palmen Plots calculation of relaxation- or retardation spectra, interconversion of material functions, computation of molecular weight distribution by means of dynamic data
  • Description of the experimental results with classical models (Maxwell model, generalized Maxwell model, Rouse- and Dop-Edwars model)
  • Description of the experimental results with linear visco-elastic theories for melts and solutions: tubular dilatation (linear star, Pom-Pom (H), tree)
  • Description of suspensions’ and emulsions’ results with the Paliarne model, computation of the particle size distribution by means of rheological data.