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IRIS Rheology Platform

Ojective The main ojective of the IRIS platform is to change the way we teach, research, and apply rheology. The current IRIS has been created specifically for the exploration of rheological experiments and theories. IRIS is meant to be an effective teaching tool and simultaneously a 'work horse' for the rheology laboratory.

Experiments The major part of the experimental section concerns Dynamic Mechanical Spectroscopy. Some sections of IRIS, however, exceed the realm of mechanical spectroscopy and lead you into a full dialog with viscoelasticity, an all encompassing investigation of the viscoelastic properties of materials. The data from mechanical spectroscopy are the starting position for this dialog. Only recently, other types of rheological data have been integrated. These are start-up of shear or extension at constant rate, steady shear viscosity, yield stress, relaxation after step strain, and shear creep.

Theories and Simulation Theory has been added only recently, and more will be added in the future. The theory section focuses on polymer melts and solutions. It allows prediction of rheological material functions from molecular and supramolecular parameters: molecular size, distribution, architecture (linear, star, branching, comb, pompom). Simulation access is in progress.

IRIS Rheology Platform The main IRIS is a "stand-alone" program. It serves as a platform to which individual modules can be written and interfaced. The platform also provides the essential graphics tools for analyzing and plotting of material data from a variety of rheological experiments and from theoretical predictions.

Specific Rheology Modules have been written to be used in conjunction with the main IRIS platform: (1) Modules for time-temperature superposition and for the calculation of relaxation time spectrum and retardation time spectrum; (2) Module for steady shear (including yield stress models); (3) Module for time-resolved mechanical spectroscopy (gelation, degradation, reverse gelation); (4) Module for second shift (concentration, pH, molar mass, etc.); (5) Polymer melts and solutions: tube dilation theory module (Blackwell/McLeish); (6) Polymer melts and solutions: molecular stress function theory module (Wagner); (7) Emulsion module of Palierne model; (8) simulation with NAPLES. Many smaller topics are covered and more moduli are in preparation.

Related Modules have been written to be used in conjunction with the main IRIS platform. The main focus is on calculations of the molecular weight distribution of linear polymers from from G', G" data using the model by Cocchini and Nobile. It also is possible to generate a GEX distribution from Mn, Mw, Mz.






Figure:
Rheology platform with modules attached


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